The Experts below are selected from a list of 246 Experts worldwide ranked by ideXlab platform
A.j. White - One of the best experts on this subject based on the ideXlab platform.
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The Effect of Water Injection on Multispool Gas Turbine Behavior
Journal of Engineering for Gas Turbines and Power, 2006Co-Authors: A.j. Meacock, A.j. WhiteAbstract:Background: The injection of water droplets into industrial gas Turbines is now commonplace and is central to several proposed advanced cycles. These cycles benefit from the subsequent reduction in compressor Work, the increase in Turbine Work, and (in the case of recuperated cycles) reduction in compressor delivery temperature, which all act to increase the efficiency and power output. An investigation is presented here into the effect such water droplets will have on the operating point and flow characteristics of an aeroderivative gas Turbine cycle. Method of Approach: The paper first describes the development of a computer program to study the effects of water injection in multispool industrial gas Turbines. The program can operate in two modes: the first uses predetermined nondimensional wet compressor maps to match the components and is instructive and fast but limited in scope; the second uses the compressor geometries as input and calculates the wet compressor operating conditions as and when required. As a result, it is more computationally demanding, but can cope with a wider range of circumstances. In both cases the compressor characteristics are calculated from a mean-line analysis using suitable loss, deviation and blockage models, coupled with Lagrangian-style droplet evaporation calculations. The program has been applied to a three-spool machine to address issues such as the effects of water injection on power output and overall efficiency, and the off-design nature of the compressor operation. Results: Preliminary results calculated on this basis show s imilar trends to predictions for single-shaft machines, namely that air mass flow rates and pressure ratios are increased by water injection, and that early stages of the compressor are shifted towards choke and rear stages towards stall. The LP compressor in particular operates at severely off-design conditions. Conclusions: The predicted overall perf ormance of the three-spool machine shows a substantial power boost and a marginal increase in thermal efficiency. Copyright © 2006 by ASME.
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The effect of water injection on multi-spool gas Turbine behaviour
Proceedings of the ASME Turbo Expo 2004, 2004Co-Authors: A.j. Meacock, A.j. WhiteAbstract:The injection of water droplets into industrial gas Turbines is now common place and is central to several proposed advanced cycles. These cycles benefit from the subsequent reduction in compressor Work, the increase in Turbine Work, and (in the case of recuperated cycles) reduction in compressor delivery temperature, which all act to increase the efficiency and power output. An investigation is presented here into the effect such water droplets will have on the operating point and flow characteristics of an aero-derivative gas Turbine cycle. The paper first describes the development of a computer program to study the effects of water injection in multi-spool industrial gas Turbines. The program can operate in two modes: the first uses pre-determined non-dimensional wet compressor maps to match the components and is instructive and fast but limited in scope; the second uses the compressor geometries as input and calculates the wet compressor operating conditions as and when required. As a result, it is more computationally demanding, but can cope with a wider range of circumstances. In both cases the compressor characteristics are calculated from a mean-line analysis using suitable loss, deviation and blockage models, coupled with Lagrangian-style droplet evaporation calculations. The program has been applied to a three-spool machine to address issues such as the effects of water-injection on power output and overall efficiency, and the off-design nature of the compressor operation.
D. Yogi Goswami - One of the best experts on this subject based on the ideXlab platform.
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Novel Combined Power and Cooling Thermodynamic Cycle for Low Temperature Heat Sources, Part II: Experimental Investigation
Journal of Solar Energy Engineering, 2003Co-Authors: Gunmar Tamm, D. Yogi GoswamiAbstract:A combined thermal power and cooling cycle proposed by Goswami is under intensive investigation, both theoretically and experimentally. The proposed cycle combines the Rankine and absorption refrigeration cycles, producing refrigeration while power is the primary goal. A binary ammonia-water mixture is used as the Working fluid. This cycle can be used as a bottoming cycle using waste heat from a conventional power cycle or as an independent cycle using low temperature sources such as geothermal and solar energy. An experimental system was constructed to demonstrate the feasibility of the cycle and to compare the experimental results with the theoretical simulation. Results showed that the vapor generation and absorption condensation processes Work experimentally, exhibiting expected trends, but with deviations from ideal and equilibrium modeling. The potential for combined Turbine Work and refrigeration output was evidenced in operating the system. Analysis of losses showed where improvements could be made, in preparation for further testing over a broader range of operating conditions.
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Novel Combined Power and Cooling Thermodynamic Cycle for Low Temperature Heat Sources, Part I: Theoretical Investigation
Journal of Solar Energy Engineering-transactions of The Asme, 2003Co-Authors: Gunmar Tamm, D. Yogi Goswami, Shaoguang Lu, Afif HasanAbstract:A combined thermal power and cooling cycle proposed by Goswami is under intensive investigation, both theoretically and experimentally. The proposed cycle combines the Rankine and absorption refrigeration cycles, producing refrigeration while power is the primary goal. A binary ammonia-water mixture is used as the Working fluid. This cycle can be used as a bottoming cycle using waste heat from a conventional power cycle or an independent cycle using low temperature sources such as geothermal and solar energy. An experimental system was constructed to demonstrate the feasibility of the cycle and to compare the experimental results with the theoretical simulation. Results showed that the vapor generation and absorption condensation processes Work experimentally, exhibiting expected trends, but with deviations from ideal and equilibrium modeling. The potential for combined Turbine Work and refrigeration output was evidenced in operating the system. Analysis of losses showed where improvements could be made, in preparation for further testing over a broader range of operating parameters.Copyright © 2002 by ASME
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A Novel Combined Power and Cooling Thermodynamic Cycle for Low Temperature Heat Sources: Part II — Experimental Investigation
Solar Energy, 2002Co-Authors: Gunmar Tamm, D. Yogi GoswamiAbstract:A combined thermal power and cooling cycle proposed by Goswami is under intensive investigation, both theoretically and experimentally. The proposed cycle combines the Rankine and absorption refrigeration cycles, producing refrigeration while power is the primary goal. A binary ammonia-water mixture is used as the Working fluid. This cycle can be used as a bottoming cycle using waste heat from a conventional power cycle or an independent cycle using low temperature sources such as geothermal and solar energy. An experimental system was constructed to demonstrate the feasibility of the cycle and to compare the experimental results with the theoretical simulation. Results showed that the vapor generation and absorption condensation processes Work experimentally, exhibiting expected trends, but with deviations from ideal and equilibrium modeling. The potential for combined Turbine Work and refrigeration output was evidenced in operating the system. Analysis of losses showed where improvements could be made, in preparation for further testing over a broader range of operating parameters.
Daría Kolmakova - One of the best experts on this subject based on the ideXlab platform.
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Improvement Results of TK-32 Turbocompressor Turbine with Gas- Dynamics And Strength CAE-Systems
2020Co-Authors: Grigorii Popov, Oleg Baturin, Daría Kolmakova, Alexander Krivcov, Russian FederationAbstract:The results of strength and gas dynamic improvement of turbocharger TK-32 axial Turbine are presented. Turbocharger was manufactured by LLC "Penzadieselmash" (Penza, Russian) and is used as unit boost for diesel locomotive. The goal of this Work was to ensure Turbine Work capacity when rotor speed is increased by 10% without efficiency reduction. The strain-stress state analysis indicated the region of high stresses on rotor blade body at the level of 2/3 of root. These stresses exceed allowable values when rotor speed is increased. The variant of peripheral rotor blade section tangential displacement, allowing to reduce the level of stresses by 20%, was found. Gas dynamic calculation showed that variant of rotor blade modernization results in an increase of efficiency by 0.4%. Also it was shown that the increase in Turbine efficiency by 1% can be reached if the number of rotor blades is reduced by 13%. This recommendation was implemented and confirmed experimentally on a mass turbocharger TK-32.
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Strength and gas dynamic methods of development of axial Turbine turbocharger
2017 International Conference on Mechanical System and Control Engineering (ICMSC), 2017Co-Authors: Oleg Baturin, Grigorii Popov, Julia Novikova, Daría Kolmakova, Andrey VolkovAbstract:The results of strength and gas dynamic improvement of turbocharger TK-32 axial Turbine are presented. Turbocharger is manufactured by LLC "Penzadieselmash" (Penza, Russian) and used as unit boost for diesel locomotive. The aim of this Work was to ensure Turbine Work capacity when rotor speed is increased by 10% without efficiency reduction. The strain-stress state analysis indicated the region of high stresses on rotor blade body at the level of 2/3 of root. These stresses exceed allowable values when rotor speed was increased. The variant of peripheral rotor blade section tangential displacement, allowing reducing the level of stresses by 20%, was found. Gas dynamic calculation showed that variant of rotor blade modernization results in an increase of efficiency by 0.4%. Also it was shown that the increase in Turbine efficiency by 1% can be reached if the number of rotor blades is reduced by 13%. This recommendation was implemented and confirmed experimentally on a mass turbocharger TK-32 [1].
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SIMULTECH - The results of gas dynamic and strength improvement of turbocharger TK-32 axial Turbine
Proceedings of the 4th International Conference on Simulation and Modeling Methodologies Technologies and Applications, 2014Co-Authors: Valery Matveev, Oleg Baturin, Grigorii Popov, Daría KolmakovaAbstract:The results of strength and gas dynamic improvement of turbocharger TK-32 axial Turbine are presented. Turbocharger was manufactured by LLC “Penzadieselmash” (Penza, Russian) and is used as unit boost for diesel locomotive. The goal of this Work was to ensure Turbine Work capacity when rotor speed is increased by 10% without efficiency reduction. The strain-stress state analysis indicated the region of high stresses on rotor blade body at the level of 2/3 of root. These stresses exceed allowable values when rotor speed is increased. The variant of peripheral rotor blade section tangential displacement, allowing to reduce the level of stresses by 20%, was found. Gas dynamic calculation showed that variant of rotor blade modernization results in an increase of efficiency by 0.4%. Also it was shown that the increase in Turbine efficiency by 1% can be reached if the number of rotor blades is reduced by 13%. This recommendation was implemented and confirmed experimentally on a mass turbocharger TK-32.
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The results of gas dynamic and strength improvement of turbocharger TK-32 axial Turbine
2014 4th International Conference On Simulation And Modeling Methodologies Technologies And Applications (SIMULTECH), 2014Co-Authors: Valery N. Matveev, Oleg Baturin, Grigorii M. Popov, Daría KolmakovaAbstract:The results of strength and gas dynamic improvement of turbocharger TK-32 axial Turbine are presented. Turbocharger was manufactured by LLC “Penzadieselmash” (Penza, Russian) and is used as unit boost for diesel locomotive. The goal of this Work was to ensure Turbine Work capacity when rotor speed is increased by 10% without efficiency reduction. The strain-stress state analysis indicated the region of high stresses on rotor blade body at the level of 2/3 of root. These stresses exceed allowable values when rotor speed is increased. The variant of peripheral rotor blade section tangential displacement, allowing to reduce the level of stresses by 20%, was found. Gas dynamic calculation showed that variant of rotor blade modernization results in an increase of efficiency by 0.4%. Also it was shown that the increase in Turbine efficiency by 1% can be reached if the number of rotor blades is reduced by 13%. This recommendation was implemented and confirmed experimentally on a mass turbocharger TK-32.
Jung-in Yoon - One of the best experts on this subject based on the ideXlab platform.
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Efficiency enhancement of the ocean thermal energy conversion system with a vapor–vapor ejector
Advances in Mechanical Engineering, 2015Co-Authors: Jung-in Yoon, Sung hoon Seol, Soo-jung Ha, Byung Hyo Ye, Gunjoo JungAbstract:In this article, 20 kW ocean thermal energy conversion with a vapor–vapor ejector is newly proposed. As a vapor–vapor ejector is installed in the system, the pressure difference between the Turbine inlet and outlet increases. Therefore, the amount of the Working fluid required for the total Turbine Work of 20 kW is less than when no vapor–vapor ejector is installed. Therefore, installing a vapor–vapor ejector in the system decreases the evaporation capacity and the pump Work. The performance analysis considered the outlet pressure of the high-stage Turbine, the mass flow ratio of the Working fluid at the outlet of a separator just after the high-stage Turbine, and the nozzle diameters of the vapor–vapor ejector. As the outlet pressure of high-stage Turbine becomes lower, the Turbine gross power of high-stage Turbine and system efficiency increase although lower outlet pressure of high-stage Turbine results in lower ejector performance. Similarly, in terms of mass flow ratio, the highest system efficiency ...
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Performance analysis of OTEC power cycle with a liquid–vapor ejector using R32/R152a
Heat and Mass Transfer/Waerme- und Stoffuebertragung, 2015Co-Authors: Jung-in Yoon, Sung hoon Seol, Chang-hyo Son, Soo-jung Ha, Hyeon-ju Kim, Suk-ho Jung, Ho Saeng LeeAbstract:In this paper, the condensation and evaporation capacity, Turbine Work, efficiency, and main component size of the Ocean Thermal Energy Conversion (OTEC) power system with a liquid–vapor ejector are presented to offer the basic design data for the operating parameters of the system. The analysis procedure was performed with a simulation program called Aspentech HYSYS. The Working fluid used in this system is the R32/R152a mixture. The operating parameters considered in this study include the vapor quality at the reheat outlet, the pressure ratio of the ejector, the inlet pressure of Turbine 2, entrainment ratio of the liquid–vapor ejector etc. The main results are summarized as follows. The efficiency of the OTEC power cycle is closely related to the entrainment ratio of the liquid–vapor ejector. Also, the increase rate of the efficiency of proposed OTEC power cycle using the liquid–vapor ejector is 16 % higher than that of basic OTEC power cycle. Furthermore, regarding the reduction ratios of the system size that affects the initial cost, the reduction ratios of the evaporator size and the condenser size are about 13 and 14 % higher than those of basic OTEC power cycle, respectively. And, the pump power and the mass flow rate of the required refrigerant are 8 and 4 %, respectively. Therefore, the proposed OTEC power cycle is more advantageous than basic OTEC power cycle because of the compactness and high-efficiency of the system. © 2015, Springer-Verlag Berlin Heidelberg.
Ho Saeng Lee - One of the best experts on this subject based on the ideXlab platform.
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Performance analysis of OTEC power cycle with a liquid–vapor ejector using R32/R152a
Heat and Mass Transfer/Waerme- und Stoffuebertragung, 2015Co-Authors: Jung-in Yoon, Sung hoon Seol, Chang-hyo Son, Soo-jung Ha, Hyeon-ju Kim, Suk-ho Jung, Ho Saeng LeeAbstract:In this paper, the condensation and evaporation capacity, Turbine Work, efficiency, and main component size of the Ocean Thermal Energy Conversion (OTEC) power system with a liquid–vapor ejector are presented to offer the basic design data for the operating parameters of the system. The analysis procedure was performed with a simulation program called Aspentech HYSYS. The Working fluid used in this system is the R32/R152a mixture. The operating parameters considered in this study include the vapor quality at the reheat outlet, the pressure ratio of the ejector, the inlet pressure of Turbine 2, entrainment ratio of the liquid–vapor ejector etc. The main results are summarized as follows. The efficiency of the OTEC power cycle is closely related to the entrainment ratio of the liquid–vapor ejector. Also, the increase rate of the efficiency of proposed OTEC power cycle using the liquid–vapor ejector is 16 % higher than that of basic OTEC power cycle. Furthermore, regarding the reduction ratios of the system size that affects the initial cost, the reduction ratios of the evaporator size and the condenser size are about 13 and 14 % higher than those of basic OTEC power cycle, respectively. And, the pump power and the mass flow rate of the required refrigerant are 8 and 4 %, respectively. Therefore, the proposed OTEC power cycle is more advantageous than basic OTEC power cycle because of the compactness and high-efficiency of the system. © 2015, Springer-Verlag Berlin Heidelberg.
