The Experts below are selected from a list of 6963 Experts worldwide ranked by ideXlab platform
Jin-yuan Qian - One of the best experts on this subject based on the ideXlab platform.
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turbulent compressible flow analysis on multi stage high pressure Reducing Valve
Flow Measurement and Instrumentation, 2018Co-Authors: Fu-qiang Chen, Jin-yuan Qian, Min Rui Chen, Ming Zhang, Li Long ChenAbstract:Abstract Pressure Reducing Valve plays an important role in thermodynamic systems. Under extreme operating conditions, greater demands are requested on pressure Reducing systems. In this paper, a novel multi-stage high pressure Reducing Valve (MSHPRV) is proposed, which can achieve multi-stage pressure Reducing processes, improve the flow characteristics and deal with complex conditions. Here, the effects of different structural parameters on turbulent compressible flow inside MSHPRV are numerically investigated to achieve low Valve noise and energy consumption. Mach number is taken as the parameter to reflect the fluid compressibility. Higher Mach number can cause serious aerodynamic noise and large amount of energy consumption. Based on this, transmission loss of MSHPRV is also studied to achieve better noise control performances. Meanwhile, larger turbulent dissipation rate means larger degree of energy consumption, so it is with the exergy loss. Thus, numerical models with different Valve openings, perforated plate diameters, chamfer radii of perforated plates, pressure ratios and stages of perforated plates are established, and the effects of these structural parameters on the compressible turbulent flow and energy consumption of MSHPRV are investigated. Results show that different structural parameters have significant impacts on compressible turbulent flow and energy consumption performance in MSHPRV. The best noise control and least energy consumption of MSHPRV is achieved with such parameters as pressure ratio 7, perforated plate diameter 4 mm and 4 stage plates. This work can benefit the further research work on energy saving and multi-stage design of pressure Reducing devices.
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parametric analysis on throttling components of multi stage high pressure Reducing Valve
Applied Thermal Engineering, 2018Co-Authors: Fu-qiang Chen, Jin-yuan Qian, Wei Kang JiangAbstract:Abstract High pressure Reducing Valve (HPRV) is widely used for pressure and temperature control of heated steams in power plant and other related process engineering. The structures of throttling components inside HPRVs have important effects on the control performances. In this paper, a parametric study of throttling components in a multi-stage high pressure Reducing Valve (MSHPRV) is carried out, including the relative angle of inner and outer porous shrouded holes, the orifice plate thickness, the number of orifice plates and the diameter of plate holes. A numerical model is established to investigate internal flow and throttling characteristics with RNG k-e model, and it is validated by the theoretical flux calculation. The results show that, the relative angle set as 180° can obtain the largest decompression pressure when steam flows through porous shrouded Valve core, while the turbulence degree is the lowest. Setting one orifice plate can decrease the turbulent dissipation rate. The plate thickness has less influence on throttling effects. For ensuring the outlet flux, plate holes with smaller diameters should be chosen with a better flowing property on thermodynamic parameters. The work can be referred by the design work of throttling components in MSHPRV and it can also benefit the further research on similar HPRVs.
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thermo mechanical stress and fatigue damage analysis on multi stage high pressure Reducing Valve
Annals of Nuclear Energy, 2017Co-Authors: Fu-qiang Chen, Jin-yuan Qian, Ming Zhang, Li Long ChenAbstract:Abstract A multi-stage high pressure Reducing Valve (MSHPRV) is proposed. It can achieve a multi-stage pressure Reducing way. Valve failure mainly occurs under high pressure and high temperature conditions, thus it is necessary to investigate the strength of MSHPRV under those complex conditions. In this paper, the mathematical model of MSHPRV is established and Computational Fluid Dynamics (CFD) method is employed to simulate its flow fields and thermo-mechanical stress. Next, the stress of MSHPRV under different opening time and the fatigue damage of MSHPRV under different Valve openings are studied. Finally, two changes are provided on geometry of MSHPRV and the geometrical factors are optimized. The results show that, the radial direction from inner wall to outer wall is the main heat transfer direction for Valve body. At opening time 50 s, the working condition of MSHPRV is dangerous condition. Meanwhile, the maximum value of thermal stress is 487 MPa, which is located at the upper end face of Valve chamber region B3. There is a lag effect of stress distribution with respect to temperature distribution. The combined stress of Valve body is composed of thermal stress and mechanical stress, in which thermal stress holds the dominant position. Moreover, with the increasing of Valve opening, the fatigue damage of Valve body increases correspondingly. It can be concluded that MSHPRV can cope with complex conditions like high pressure and high temperature. In the optimization design of MSHPRV, it can be found that the best strength of MSHPRV is achieved with such geometrical factors as angle 15, diameter 4 mm and 2 stage plates. Besides, radian design as the improved structure is recommended. This work can benefit the further research work on the regulation performance and safe operation of high pressure Reducing Valve.
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Numerical Study on Flow Characteristics in High Multi-Stage Pressure Reducing Valve
Volume 1A Symposia: Keynotes; Advances in Numerical Modeling for Turbomachinery Flow Optimization; Fluid Machinery; Industrial and Environmental Appli, 2017Co-Authors: Fu-qiang Chen, Jin-yuan QianAbstract:In this paper, a new high multi-stage pressure Reducing Valve (HMSPRV) is proposed. The main advantages include Reducing noise and vibration, Reducing energy consumption and dealing with complex conditions. As a new high pressure Reducing Valve, its flow characteristics need to be investigated. For that the Valve opening has a great effect on steam flow, pressure reduction and energy consumption, thus different Valve openings are taken as the research points to investigate the flow characteristics. The analysis is conducted from four aspects: pressure, velocity, temperature fields and energy consumption. The results show that Valve opening has a great effect on flow characteristics. No matter for pressure, velocity or temperature field, the changing gradient mainly reflects at those throttling components for all Valve openings. For energy consumption, in the study of turbulent dissipation rate, it can be found that the larger of Valve opening, the larger of energy consumption. It can be concluded that the new high multi-stage pressure Reducing Valve works well under complex conditions. This study can provide technological support for achieving pressure regulation, and benefit the further research work on energy saving and multi-stage design of pressure Reducing devices.
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Flow rate analysis of compressible superheated steam through pressure Reducing Valves
Energy, 2017Co-Authors: Jin-yuan Qian, Wei Kang Jiang, Lin Wei, Li Long Chen, Fu-qiang Chen, Ming Zhang, Zhi Jiang JinAbstract:Steam flow is the main form for energy transfer in power plants, process industries, etc. The flow rate of the steam relates to the energy transfer amount directly. Pressure Reducing Valves are used for flow rate control of the compressible superheated steam in these piping systems. In this paper, a pressure Reducing Valve with a novel Valve core is proposed. In order to analyze the internal flow characteristics of the compressible superheated steam and the flow rate adjustment performance of the proposed pressure Reducing Valve, a numerical model of DN80 pressure Reducing Valve is established. Then, the flow characteristics inside are studied numerically. Meanwhile, the flow rate adjustment performance is also carried out experimentally. Compared with the numerical and experimental results, it shows an agreement and both of them are similar to linear flow rate. Furthermore, a fitting equation for the flow rate prediction is carried out for the engineering applications under different working conditions.
Fu-qiang Chen - One of the best experts on this subject based on the ideXlab platform.
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turbulent compressible flow analysis on multi stage high pressure Reducing Valve
Flow Measurement and Instrumentation, 2018Co-Authors: Fu-qiang Chen, Jin-yuan Qian, Min Rui Chen, Ming Zhang, Li Long ChenAbstract:Abstract Pressure Reducing Valve plays an important role in thermodynamic systems. Under extreme operating conditions, greater demands are requested on pressure Reducing systems. In this paper, a novel multi-stage high pressure Reducing Valve (MSHPRV) is proposed, which can achieve multi-stage pressure Reducing processes, improve the flow characteristics and deal with complex conditions. Here, the effects of different structural parameters on turbulent compressible flow inside MSHPRV are numerically investigated to achieve low Valve noise and energy consumption. Mach number is taken as the parameter to reflect the fluid compressibility. Higher Mach number can cause serious aerodynamic noise and large amount of energy consumption. Based on this, transmission loss of MSHPRV is also studied to achieve better noise control performances. Meanwhile, larger turbulent dissipation rate means larger degree of energy consumption, so it is with the exergy loss. Thus, numerical models with different Valve openings, perforated plate diameters, chamfer radii of perforated plates, pressure ratios and stages of perforated plates are established, and the effects of these structural parameters on the compressible turbulent flow and energy consumption of MSHPRV are investigated. Results show that different structural parameters have significant impacts on compressible turbulent flow and energy consumption performance in MSHPRV. The best noise control and least energy consumption of MSHPRV is achieved with such parameters as pressure ratio 7, perforated plate diameter 4 mm and 4 stage plates. This work can benefit the further research work on energy saving and multi-stage design of pressure Reducing devices.
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parametric analysis on throttling components of multi stage high pressure Reducing Valve
Applied Thermal Engineering, 2018Co-Authors: Fu-qiang Chen, Jin-yuan Qian, Wei Kang JiangAbstract:Abstract High pressure Reducing Valve (HPRV) is widely used for pressure and temperature control of heated steams in power plant and other related process engineering. The structures of throttling components inside HPRVs have important effects on the control performances. In this paper, a parametric study of throttling components in a multi-stage high pressure Reducing Valve (MSHPRV) is carried out, including the relative angle of inner and outer porous shrouded holes, the orifice plate thickness, the number of orifice plates and the diameter of plate holes. A numerical model is established to investigate internal flow and throttling characteristics with RNG k-e model, and it is validated by the theoretical flux calculation. The results show that, the relative angle set as 180° can obtain the largest decompression pressure when steam flows through porous shrouded Valve core, while the turbulence degree is the lowest. Setting one orifice plate can decrease the turbulent dissipation rate. The plate thickness has less influence on throttling effects. For ensuring the outlet flux, plate holes with smaller diameters should be chosen with a better flowing property on thermodynamic parameters. The work can be referred by the design work of throttling components in MSHPRV and it can also benefit the further research on similar HPRVs.
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thermo mechanical stress and fatigue damage analysis on multi stage high pressure Reducing Valve
Annals of Nuclear Energy, 2017Co-Authors: Fu-qiang Chen, Jin-yuan Qian, Ming Zhang, Li Long ChenAbstract:Abstract A multi-stage high pressure Reducing Valve (MSHPRV) is proposed. It can achieve a multi-stage pressure Reducing way. Valve failure mainly occurs under high pressure and high temperature conditions, thus it is necessary to investigate the strength of MSHPRV under those complex conditions. In this paper, the mathematical model of MSHPRV is established and Computational Fluid Dynamics (CFD) method is employed to simulate its flow fields and thermo-mechanical stress. Next, the stress of MSHPRV under different opening time and the fatigue damage of MSHPRV under different Valve openings are studied. Finally, two changes are provided on geometry of MSHPRV and the geometrical factors are optimized. The results show that, the radial direction from inner wall to outer wall is the main heat transfer direction for Valve body. At opening time 50 s, the working condition of MSHPRV is dangerous condition. Meanwhile, the maximum value of thermal stress is 487 MPa, which is located at the upper end face of Valve chamber region B3. There is a lag effect of stress distribution with respect to temperature distribution. The combined stress of Valve body is composed of thermal stress and mechanical stress, in which thermal stress holds the dominant position. Moreover, with the increasing of Valve opening, the fatigue damage of Valve body increases correspondingly. It can be concluded that MSHPRV can cope with complex conditions like high pressure and high temperature. In the optimization design of MSHPRV, it can be found that the best strength of MSHPRV is achieved with such geometrical factors as angle 15, diameter 4 mm and 2 stage plates. Besides, radian design as the improved structure is recommended. This work can benefit the further research work on the regulation performance and safe operation of high pressure Reducing Valve.
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Numerical Study on Flow Characteristics in High Multi-Stage Pressure Reducing Valve
Volume 1A Symposia: Keynotes; Advances in Numerical Modeling for Turbomachinery Flow Optimization; Fluid Machinery; Industrial and Environmental Appli, 2017Co-Authors: Fu-qiang Chen, Jin-yuan QianAbstract:In this paper, a new high multi-stage pressure Reducing Valve (HMSPRV) is proposed. The main advantages include Reducing noise and vibration, Reducing energy consumption and dealing with complex conditions. As a new high pressure Reducing Valve, its flow characteristics need to be investigated. For that the Valve opening has a great effect on steam flow, pressure reduction and energy consumption, thus different Valve openings are taken as the research points to investigate the flow characteristics. The analysis is conducted from four aspects: pressure, velocity, temperature fields and energy consumption. The results show that Valve opening has a great effect on flow characteristics. No matter for pressure, velocity or temperature field, the changing gradient mainly reflects at those throttling components for all Valve openings. For energy consumption, in the study of turbulent dissipation rate, it can be found that the larger of Valve opening, the larger of energy consumption. It can be concluded that the new high multi-stage pressure Reducing Valve works well under complex conditions. This study can provide technological support for achieving pressure regulation, and benefit the further research work on energy saving and multi-stage design of pressure Reducing devices.
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Flow rate analysis of compressible superheated steam through pressure Reducing Valves
Energy, 2017Co-Authors: Jin-yuan Qian, Wei Kang Jiang, Lin Wei, Li Long Chen, Fu-qiang Chen, Ming Zhang, Zhi Jiang JinAbstract:Steam flow is the main form for energy transfer in power plants, process industries, etc. The flow rate of the steam relates to the energy transfer amount directly. Pressure Reducing Valves are used for flow rate control of the compressible superheated steam in these piping systems. In this paper, a pressure Reducing Valve with a novel Valve core is proposed. In order to analyze the internal flow characteristics of the compressible superheated steam and the flow rate adjustment performance of the proposed pressure Reducing Valve, a numerical model of DN80 pressure Reducing Valve is established. Then, the flow characteristics inside are studied numerically. Meanwhile, the flow rate adjustment performance is also carried out experimentally. Compared with the numerical and experimental results, it shows an agreement and both of them are similar to linear flow rate. Furthermore, a fitting equation for the flow rate prediction is carried out for the engineering applications under different working conditions.
Li Long Chen - One of the best experts on this subject based on the ideXlab platform.
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turbulent compressible flow analysis on multi stage high pressure Reducing Valve
Flow Measurement and Instrumentation, 2018Co-Authors: Fu-qiang Chen, Jin-yuan Qian, Min Rui Chen, Ming Zhang, Li Long ChenAbstract:Abstract Pressure Reducing Valve plays an important role in thermodynamic systems. Under extreme operating conditions, greater demands are requested on pressure Reducing systems. In this paper, a novel multi-stage high pressure Reducing Valve (MSHPRV) is proposed, which can achieve multi-stage pressure Reducing processes, improve the flow characteristics and deal with complex conditions. Here, the effects of different structural parameters on turbulent compressible flow inside MSHPRV are numerically investigated to achieve low Valve noise and energy consumption. Mach number is taken as the parameter to reflect the fluid compressibility. Higher Mach number can cause serious aerodynamic noise and large amount of energy consumption. Based on this, transmission loss of MSHPRV is also studied to achieve better noise control performances. Meanwhile, larger turbulent dissipation rate means larger degree of energy consumption, so it is with the exergy loss. Thus, numerical models with different Valve openings, perforated plate diameters, chamfer radii of perforated plates, pressure ratios and stages of perforated plates are established, and the effects of these structural parameters on the compressible turbulent flow and energy consumption of MSHPRV are investigated. Results show that different structural parameters have significant impacts on compressible turbulent flow and energy consumption performance in MSHPRV. The best noise control and least energy consumption of MSHPRV is achieved with such parameters as pressure ratio 7, perforated plate diameter 4 mm and 4 stage plates. This work can benefit the further research work on energy saving and multi-stage design of pressure Reducing devices.
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thermo mechanical stress and fatigue damage analysis on multi stage high pressure Reducing Valve
Annals of Nuclear Energy, 2017Co-Authors: Fu-qiang Chen, Jin-yuan Qian, Ming Zhang, Li Long ChenAbstract:Abstract A multi-stage high pressure Reducing Valve (MSHPRV) is proposed. It can achieve a multi-stage pressure Reducing way. Valve failure mainly occurs under high pressure and high temperature conditions, thus it is necessary to investigate the strength of MSHPRV under those complex conditions. In this paper, the mathematical model of MSHPRV is established and Computational Fluid Dynamics (CFD) method is employed to simulate its flow fields and thermo-mechanical stress. Next, the stress of MSHPRV under different opening time and the fatigue damage of MSHPRV under different Valve openings are studied. Finally, two changes are provided on geometry of MSHPRV and the geometrical factors are optimized. The results show that, the radial direction from inner wall to outer wall is the main heat transfer direction for Valve body. At opening time 50 s, the working condition of MSHPRV is dangerous condition. Meanwhile, the maximum value of thermal stress is 487 MPa, which is located at the upper end face of Valve chamber region B3. There is a lag effect of stress distribution with respect to temperature distribution. The combined stress of Valve body is composed of thermal stress and mechanical stress, in which thermal stress holds the dominant position. Moreover, with the increasing of Valve opening, the fatigue damage of Valve body increases correspondingly. It can be concluded that MSHPRV can cope with complex conditions like high pressure and high temperature. In the optimization design of MSHPRV, it can be found that the best strength of MSHPRV is achieved with such geometrical factors as angle 15, diameter 4 mm and 2 stage plates. Besides, radian design as the improved structure is recommended. This work can benefit the further research work on the regulation performance and safe operation of high pressure Reducing Valve.
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Flow rate analysis of compressible superheated steam through pressure Reducing Valves
Energy, 2017Co-Authors: Jin-yuan Qian, Wei Kang Jiang, Lin Wei, Li Long Chen, Fu-qiang Chen, Ming Zhang, Zhi Jiang JinAbstract:Steam flow is the main form for energy transfer in power plants, process industries, etc. The flow rate of the steam relates to the energy transfer amount directly. Pressure Reducing Valves are used for flow rate control of the compressible superheated steam in these piping systems. In this paper, a pressure Reducing Valve with a novel Valve core is proposed. In order to analyze the internal flow characteristics of the compressible superheated steam and the flow rate adjustment performance of the proposed pressure Reducing Valve, a numerical model of DN80 pressure Reducing Valve is established. Then, the flow characteristics inside are studied numerically. Meanwhile, the flow rate adjustment performance is also carried out experimentally. Compared with the numerical and experimental results, it shows an agreement and both of them are similar to linear flow rate. Furthermore, a fitting equation for the flow rate prediction is carried out for the engineering applications under different working conditions.
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mach number analysis on multi stage perforated plates in high pressure Reducing Valve
Energy Conversion and Management, 2016Co-Authors: Jin-yuan Qian, Fu-qiang Chen, Ming Zhang, Li Long ChenAbstract:High pressure Reducing Valve (HPRV) is a key device for the pressure control of high temperature and pressure steam in industrial processes. Perforated plate is used as the throttling element to ensure the suitable pressure of steam and reduce aerodynamic noise inside HPRV and the linked pipelines. Mach number is the parameter to reflect the compressibility of steam flow. Higher Mach number may cause serious aerodynamic noise of steams flow, waste large amount of energy and do harm to the Valves and pipelines. In this paper, Mach number on multi-stage perforated plates inside a novel HPRV and the linked pipelines is investigated. Mach number in reversible isentropic process is analyzed and the design method of multi-stage perforated plates in HPRV is proposed. Then, the RNG k-ϵ model combining with compressible gas is established, and the Mach number simulation of single perforated plate and multi-stage perforated plates is carried out in software Fluent 6.3. Meanwhile, Mach number inside HPRV is also presented, and the pressure ratio of perforated plate is also investigated. It can be found that under higher pressure ratio, the influence area of the last perforated plate becomes larger, and the energy loss in perforated plate is larger than the Valve core. Furthermore, there exists a limited pressure ratio of every stage perforated plate, and it is better to keep the pressure ratio of every stage perforated plate larger than 0.5. This work presents the function of perforated plates in HPRV for throttling and Reducing aerodynamic noises, and it can benefit the researchers who are dealing with multi-stage perforated plates design for Valves and pipelines. (Less)
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numerical analysis of flow and temperature characteristics in a high multi stage pressure Reducing Valve for hydrogen refueling station
International Journal of Hydrogen Energy, 2016Co-Authors: Fu-qiang Chen, Jin-yuan Qian, Li Long Chen, Ming Zhang, Fei WangAbstract:Hydrogen refueling station is one of the most important parts for the hydrogen energy utilization. In this paper, a novel high multi-stage pressure Reducing Valve (HMSPRV) is proposed, which can be used for hydrogen stable decompression in hydrogen refueling station. In HMSPRV, the inner and outer porous shrouded Valve core is used to replace piston Valve core to achieve the first-stage throttling, and the porous orifice plate is chosen as the second-stage throttling component. Meanwhile, in order to verify the applicability of HMSPRV, the flow characteristics of two fluids are studied. Firstly, the choked flow, flow and temperature characteristics of superheated steam under different Valve openings are carried out. Secondly, the flow characteristic of hydrogen is also conducted to validate the application of HMSPRV in hydrogen refueling station. The results show that, for superheated steam flow, with the increasing of Valve openings, the maximum gradient of fluid pressure moves from the fitting surface where inner and outer porous shrouded to the orifice plate. The regulation of its amount is decreasing first and then increasing. With the increasing of Valve openings, the maximum velocity, turbulent dissipation rate and pressure loss are all increasing gradually, while the temperature does not change significantly. For hydrogen flow, both the pressure changing process and velocity changing process are similar to superheated steam. It can be concluded that HMSPRV has good flow and temperature characteristics in complex conditions, and it does not prone to choked flow. Throttling effect of the multi-stage pressure Reducing way is obvious. This work can benefit the further research work on hydrogen stable decompression in hydrogen refueling station.
Ming Zhang - One of the best experts on this subject based on the ideXlab platform.
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turbulent compressible flow analysis on multi stage high pressure Reducing Valve
Flow Measurement and Instrumentation, 2018Co-Authors: Fu-qiang Chen, Jin-yuan Qian, Min Rui Chen, Ming Zhang, Li Long ChenAbstract:Abstract Pressure Reducing Valve plays an important role in thermodynamic systems. Under extreme operating conditions, greater demands are requested on pressure Reducing systems. In this paper, a novel multi-stage high pressure Reducing Valve (MSHPRV) is proposed, which can achieve multi-stage pressure Reducing processes, improve the flow characteristics and deal with complex conditions. Here, the effects of different structural parameters on turbulent compressible flow inside MSHPRV are numerically investigated to achieve low Valve noise and energy consumption. Mach number is taken as the parameter to reflect the fluid compressibility. Higher Mach number can cause serious aerodynamic noise and large amount of energy consumption. Based on this, transmission loss of MSHPRV is also studied to achieve better noise control performances. Meanwhile, larger turbulent dissipation rate means larger degree of energy consumption, so it is with the exergy loss. Thus, numerical models with different Valve openings, perforated plate diameters, chamfer radii of perforated plates, pressure ratios and stages of perforated plates are established, and the effects of these structural parameters on the compressible turbulent flow and energy consumption of MSHPRV are investigated. Results show that different structural parameters have significant impacts on compressible turbulent flow and energy consumption performance in MSHPRV. The best noise control and least energy consumption of MSHPRV is achieved with such parameters as pressure ratio 7, perforated plate diameter 4 mm and 4 stage plates. This work can benefit the further research work on energy saving and multi-stage design of pressure Reducing devices.
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thermo mechanical stress and fatigue damage analysis on multi stage high pressure Reducing Valve
Annals of Nuclear Energy, 2017Co-Authors: Fu-qiang Chen, Jin-yuan Qian, Ming Zhang, Li Long ChenAbstract:Abstract A multi-stage high pressure Reducing Valve (MSHPRV) is proposed. It can achieve a multi-stage pressure Reducing way. Valve failure mainly occurs under high pressure and high temperature conditions, thus it is necessary to investigate the strength of MSHPRV under those complex conditions. In this paper, the mathematical model of MSHPRV is established and Computational Fluid Dynamics (CFD) method is employed to simulate its flow fields and thermo-mechanical stress. Next, the stress of MSHPRV under different opening time and the fatigue damage of MSHPRV under different Valve openings are studied. Finally, two changes are provided on geometry of MSHPRV and the geometrical factors are optimized. The results show that, the radial direction from inner wall to outer wall is the main heat transfer direction for Valve body. At opening time 50 s, the working condition of MSHPRV is dangerous condition. Meanwhile, the maximum value of thermal stress is 487 MPa, which is located at the upper end face of Valve chamber region B3. There is a lag effect of stress distribution with respect to temperature distribution. The combined stress of Valve body is composed of thermal stress and mechanical stress, in which thermal stress holds the dominant position. Moreover, with the increasing of Valve opening, the fatigue damage of Valve body increases correspondingly. It can be concluded that MSHPRV can cope with complex conditions like high pressure and high temperature. In the optimization design of MSHPRV, it can be found that the best strength of MSHPRV is achieved with such geometrical factors as angle 15, diameter 4 mm and 2 stage plates. Besides, radian design as the improved structure is recommended. This work can benefit the further research work on the regulation performance and safe operation of high pressure Reducing Valve.
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Flow rate analysis of compressible superheated steam through pressure Reducing Valves
Energy, 2017Co-Authors: Jin-yuan Qian, Wei Kang Jiang, Lin Wei, Li Long Chen, Fu-qiang Chen, Ming Zhang, Zhi Jiang JinAbstract:Steam flow is the main form for energy transfer in power plants, process industries, etc. The flow rate of the steam relates to the energy transfer amount directly. Pressure Reducing Valves are used for flow rate control of the compressible superheated steam in these piping systems. In this paper, a pressure Reducing Valve with a novel Valve core is proposed. In order to analyze the internal flow characteristics of the compressible superheated steam and the flow rate adjustment performance of the proposed pressure Reducing Valve, a numerical model of DN80 pressure Reducing Valve is established. Then, the flow characteristics inside are studied numerically. Meanwhile, the flow rate adjustment performance is also carried out experimentally. Compared with the numerical and experimental results, it shows an agreement and both of them are similar to linear flow rate. Furthermore, a fitting equation for the flow rate prediction is carried out for the engineering applications under different working conditions.
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mach number analysis on multi stage perforated plates in high pressure Reducing Valve
Energy Conversion and Management, 2016Co-Authors: Jin-yuan Qian, Fu-qiang Chen, Ming Zhang, Li Long ChenAbstract:High pressure Reducing Valve (HPRV) is a key device for the pressure control of high temperature and pressure steam in industrial processes. Perforated plate is used as the throttling element to ensure the suitable pressure of steam and reduce aerodynamic noise inside HPRV and the linked pipelines. Mach number is the parameter to reflect the compressibility of steam flow. Higher Mach number may cause serious aerodynamic noise of steams flow, waste large amount of energy and do harm to the Valves and pipelines. In this paper, Mach number on multi-stage perforated plates inside a novel HPRV and the linked pipelines is investigated. Mach number in reversible isentropic process is analyzed and the design method of multi-stage perforated plates in HPRV is proposed. Then, the RNG k-ϵ model combining with compressible gas is established, and the Mach number simulation of single perforated plate and multi-stage perforated plates is carried out in software Fluent 6.3. Meanwhile, Mach number inside HPRV is also presented, and the pressure ratio of perforated plate is also investigated. It can be found that under higher pressure ratio, the influence area of the last perforated plate becomes larger, and the energy loss in perforated plate is larger than the Valve core. Furthermore, there exists a limited pressure ratio of every stage perforated plate, and it is better to keep the pressure ratio of every stage perforated plate larger than 0.5. This work presents the function of perforated plates in HPRV for throttling and Reducing aerodynamic noises, and it can benefit the researchers who are dealing with multi-stage perforated plates design for Valves and pipelines. (Less)
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numerical analysis of flow and temperature characteristics in a high multi stage pressure Reducing Valve for hydrogen refueling station
International Journal of Hydrogen Energy, 2016Co-Authors: Fu-qiang Chen, Jin-yuan Qian, Li Long Chen, Ming Zhang, Fei WangAbstract:Hydrogen refueling station is one of the most important parts for the hydrogen energy utilization. In this paper, a novel high multi-stage pressure Reducing Valve (HMSPRV) is proposed, which can be used for hydrogen stable decompression in hydrogen refueling station. In HMSPRV, the inner and outer porous shrouded Valve core is used to replace piston Valve core to achieve the first-stage throttling, and the porous orifice plate is chosen as the second-stage throttling component. Meanwhile, in order to verify the applicability of HMSPRV, the flow characteristics of two fluids are studied. Firstly, the choked flow, flow and temperature characteristics of superheated steam under different Valve openings are carried out. Secondly, the flow characteristic of hydrogen is also conducted to validate the application of HMSPRV in hydrogen refueling station. The results show that, for superheated steam flow, with the increasing of Valve openings, the maximum gradient of fluid pressure moves from the fitting surface where inner and outer porous shrouded to the orifice plate. The regulation of its amount is decreasing first and then increasing. With the increasing of Valve openings, the maximum velocity, turbulent dissipation rate and pressure loss are all increasing gradually, while the temperature does not change significantly. For hydrogen flow, both the pressure changing process and velocity changing process are similar to superheated steam. It can be concluded that HMSPRV has good flow and temperature characteristics in complex conditions, and it does not prone to choked flow. Throttling effect of the multi-stage pressure Reducing way is obvious. This work can benefit the further research work on hydrogen stable decompression in hydrogen refueling station.
Wei Kang Jiang - One of the best experts on this subject based on the ideXlab platform.
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parametric analysis on throttling components of multi stage high pressure Reducing Valve
Applied Thermal Engineering, 2018Co-Authors: Fu-qiang Chen, Jin-yuan Qian, Wei Kang JiangAbstract:Abstract High pressure Reducing Valve (HPRV) is widely used for pressure and temperature control of heated steams in power plant and other related process engineering. The structures of throttling components inside HPRVs have important effects on the control performances. In this paper, a parametric study of throttling components in a multi-stage high pressure Reducing Valve (MSHPRV) is carried out, including the relative angle of inner and outer porous shrouded holes, the orifice plate thickness, the number of orifice plates and the diameter of plate holes. A numerical model is established to investigate internal flow and throttling characteristics with RNG k-e model, and it is validated by the theoretical flux calculation. The results show that, the relative angle set as 180° can obtain the largest decompression pressure when steam flows through porous shrouded Valve core, while the turbulence degree is the lowest. Setting one orifice plate can decrease the turbulent dissipation rate. The plate thickness has less influence on throttling effects. For ensuring the outlet flux, plate holes with smaller diameters should be chosen with a better flowing property on thermodynamic parameters. The work can be referred by the design work of throttling components in MSHPRV and it can also benefit the further research on similar HPRVs.
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Flow rate analysis of compressible superheated steam through pressure Reducing Valves
Energy, 2017Co-Authors: Jin-yuan Qian, Wei Kang Jiang, Lin Wei, Li Long Chen, Fu-qiang Chen, Ming Zhang, Zhi Jiang JinAbstract:Steam flow is the main form for energy transfer in power plants, process industries, etc. The flow rate of the steam relates to the energy transfer amount directly. Pressure Reducing Valves are used for flow rate control of the compressible superheated steam in these piping systems. In this paper, a pressure Reducing Valve with a novel Valve core is proposed. In order to analyze the internal flow characteristics of the compressible superheated steam and the flow rate adjustment performance of the proposed pressure Reducing Valve, a numerical model of DN80 pressure Reducing Valve is established. Then, the flow characteristics inside are studied numerically. Meanwhile, the flow rate adjustment performance is also carried out experimentally. Compared with the numerical and experimental results, it shows an agreement and both of them are similar to linear flow rate. Furthermore, a fitting equation for the flow rate prediction is carried out for the engineering applications under different working conditions.