The Experts below are selected from a list of 324 Experts worldwide ranked by ideXlab platform

Jinyuan Qian - One of the best experts on this subject based on the ideXlab platform.

  • aerodynamics analysis of superheated steam flow through multi stage Perforated Plates
    International Journal of Heat and Mass Transfer, 2019
    Co-Authors: Jinyuan Qian, Jiayi Wu
    Abstract:

    Abstract Superheated steam is the main medium in the piping system of steam power plants. In these pipelines, Perforated Plates are widely used to regulate the flow rate, pressure, and also reduce aerodynamics noise of steam. For the superheated steam flow, the flow resistance and aerodynamic noise are two key parameters of the Perforated Plates. In order to investigate the flow resistance and steam aerodynamic characteristics, this paper presents a systematic study of superheated steam and water through multi-stage Perforated Plates under a wide range of operating conditions with both experimental and numerical methods. The experiments are conducted out to validate the applicability of the adopted numerical models. Then numerical methods are used to investigate the water flow resistance and the Mach number distributions of the steam flow with different structural parameters. The results show that with the increase of the holes diameter, the pressure drop decreases and the Mach number increases. Mach number drops significantly when the position of side holes moves towards the edge of the Perforated plate. A critical stage distance is found, at which the pressure drop has the maximum value. Besides, the occurrence probability of supersonic steam flow increases as the decrease of stage distance under a restricted space, and the disturbed length of supersonic steam flow is longer when the stage distance is smaller. This work can be referred by someone who deals with Perforated plate design in steam piping systems or related research topics.

  • Transient Simulation on Dynamic Motion of Mobile Perforated Plate in Two Stage Spring Linked Perforated Plates
    Volume 3: Fluid Machinery; Erosion Slurry Sedimentation; Experimental Multiscale and Numerical Methods for Multiphase Flows; Gas-Liquid Gas-Solid and , 2018
    Co-Authors: Jinyuan Qian
    Abstract:

    In a piping system, due to the sudden opening or closing of valves and pumps etc., pressure inside can be changed both rapidly and suddenly, which may cause water hammer, noise, vibration, and even damage the whole piping system seriously. Thus, to stabilize pressure in piping system under a target value is very important. In this paper, a novel pressure regulation component, two-stage spring linked Perforated plate (TSP), is proposed, which is mainly made up of a fixed Perforated plate, a mobile Perforated plate and a spring to link them. To begin with, a transient numerical model of a TSP is established and the simulation results are compared with the theoretical formula for the purpose of validation. Then, its dynamic flow and pressure characteristics are investigated under typical inlet pressure and outlet pressure to present its advantage on pressure stabilization. Meanwhile, different pressure ratios from 1 to 2 are all investigated on dynamic motion of mobile Perforated plate. Under different working conditions, the displacement during the dynamic motion at different flow time, the response time to reach the final stabilization, and pressure characteristics are all figured out. This work can be useful for the further design work on two-stage spring linked Perforated Plates and similar pressure regulation components.

  • mach number analysis on multi stage Perforated Plates in high pressure reducing valve
    Energy Conversion and Management, 2016
    Co-Authors: Jinyuan Qian, Fu Qiang Chen, Ming Zhang, Li Long Chen
    Abstract:

    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)

  • transmission loss analysis of thick Perforated Plates for valve contained pipelines
    Energy Conversion and Management, 2016
    Co-Authors: Jinyuan Qian, Fu Qiang Chen
    Abstract:

    Valve contained pipelines have witnessed a great growth and there exists a lot of noise caused by valves. Thick Perforated Plates are especially used is valve contained pipelines for the noise control, but there are limited literatures about its noise control performances under different structural parameter of thick Perforated Plates, which limits its popularization and application. In this paper, transmission loss (TL) predictions of various thick Perforated Plates are carried out to analyze the noise control performances. Finite element method (FEM) is implemented to simulate the acoustic response, and TL is achieved by the sound pressure of four points on both sides of the thick Perforated Plates. Adopted numerical method shows good agreements with the existing research works and the results indicate that reducing the margin of the Plates can enhance TL of some frequencies. Similar to chamber mufflers, the maximum TL depends on the area ratio and the frequency range with the best noise control performance is related to the plate thickness. Meanwhile, the low velocity flow does not affect the TL curve so much and in the situation of supersonic flow, and the TL curve turns into a periodic shape, which may weaken the effects of noise control. Besides, based on the analytical solution of TL for the chamber muffler, a linear correction formula of maximum TL is proposed for the thick Perforated plate. This work can give several advices for similar Perforated Plates design works and someone who are dealing with decreasing the noise effects from the valves in pipelines.

Fu Qiang Chen - One of the best experts on this subject based on the ideXlab platform.

  • mach number analysis on multi stage Perforated Plates in high pressure reducing valve
    Energy Conversion and Management, 2016
    Co-Authors: Jinyuan Qian, Fu Qiang Chen, Ming Zhang, Li Long Chen
    Abstract:

    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)

  • transmission loss analysis of thick Perforated Plates for valve contained pipelines
    Energy Conversion and Management, 2016
    Co-Authors: Jinyuan Qian, Fu Qiang Chen
    Abstract:

    Valve contained pipelines have witnessed a great growth and there exists a lot of noise caused by valves. Thick Perforated Plates are especially used is valve contained pipelines for the noise control, but there are limited literatures about its noise control performances under different structural parameter of thick Perforated Plates, which limits its popularization and application. In this paper, transmission loss (TL) predictions of various thick Perforated Plates are carried out to analyze the noise control performances. Finite element method (FEM) is implemented to simulate the acoustic response, and TL is achieved by the sound pressure of four points on both sides of the thick Perforated Plates. Adopted numerical method shows good agreements with the existing research works and the results indicate that reducing the margin of the Plates can enhance TL of some frequencies. Similar to chamber mufflers, the maximum TL depends on the area ratio and the frequency range with the best noise control performance is related to the plate thickness. Meanwhile, the low velocity flow does not affect the TL curve so much and in the situation of supersonic flow, and the TL curve turns into a periodic shape, which may weaken the effects of noise control. Besides, based on the analytical solution of TL for the chamber muffler, a linear correction formula of maximum TL is proposed for the thick Perforated plate. This work can give several advices for similar Perforated Plates design works and someone who are dealing with decreasing the noise effects from the valves in pipelines.

Li Long Chen - One of the best experts on this subject based on the ideXlab platform.

  • mach number analysis on multi stage Perforated Plates in high pressure reducing valve
    Energy Conversion and Management, 2016
    Co-Authors: Jinyuan Qian, Fu Qiang Chen, Ming Zhang, Li Long Chen
    Abstract:

    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)

Jiayi Wu - One of the best experts on this subject based on the ideXlab platform.

  • aerodynamics analysis of superheated steam flow through multi stage Perforated Plates
    International Journal of Heat and Mass Transfer, 2019
    Co-Authors: Jinyuan Qian, Jiayi Wu
    Abstract:

    Abstract Superheated steam is the main medium in the piping system of steam power plants. In these pipelines, Perforated Plates are widely used to regulate the flow rate, pressure, and also reduce aerodynamics noise of steam. For the superheated steam flow, the flow resistance and aerodynamic noise are two key parameters of the Perforated Plates. In order to investigate the flow resistance and steam aerodynamic characteristics, this paper presents a systematic study of superheated steam and water through multi-stage Perforated Plates under a wide range of operating conditions with both experimental and numerical methods. The experiments are conducted out to validate the applicability of the adopted numerical models. Then numerical methods are used to investigate the water flow resistance and the Mach number distributions of the steam flow with different structural parameters. The results show that with the increase of the holes diameter, the pressure drop decreases and the Mach number increases. Mach number drops significantly when the position of side holes moves towards the edge of the Perforated plate. A critical stage distance is found, at which the pressure drop has the maximum value. Besides, the occurrence probability of supersonic steam flow increases as the decrease of stage distance under a restricted space, and the disturbed length of supersonic steam flow is longer when the stage distance is smaller. This work can be referred by someone who deals with Perforated plate design in steam piping systems or related research topics.

Ming Zhang - One of the best experts on this subject based on the ideXlab platform.

  • mach number analysis on multi stage Perforated Plates in high pressure reducing valve
    Energy Conversion and Management, 2016
    Co-Authors: Jinyuan Qian, Fu Qiang Chen, Ming Zhang, Li Long Chen
    Abstract:

    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)