The Experts below are selected from a list of 15 Experts worldwide ranked by ideXlab platform
Manfred Aigner - One of the best experts on this subject based on the ideXlab platform.
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experimental investigations of pressure losses on the performance of a micro gas turbine system
Volume 3: Controls Diagnostics and Instrumentation; Cycle Innovations; Marine, 2010Co-Authors: Jan Zanger, Axel Widenhorn, Manfred AignerAbstract:Pressure losses between compressor outlet and turbine inlet are a major issue of overall efficiency and system stability for a SOFC/MGT hybrid power plant system. The goal of this work is the detailed analysis of the effects of additional pressure losses on MGT performance in terms of steady-state and transient conditions. The experiments were performed at the micro gas turbine test rig at the German Aerospace Centre in Stuttgart using a Butterfly Control Valve to apply additional pressure loss. The paper reports electric power and pressure characteristics at steady-state conditions, as well as, a new surge limit, which was found for the Turbec T100 micro gas turbine. Furthermore, the effects of additional pressure loss on compressor surge margin are quantified and a linear relation between relative surge margin and additional pressure loss is shown. For transient variation of pressure loss at constant turbine speed time delays are presented and a compensation issue of the commercial gas turbine Controller is discussed. Finally, bleed-air blow-off and reduction of turbine outlet temperature are introduced as methods of increasing surge margin. It is quantified that both methods have a substantial effect on compressor surge margin. Furthermore, a comparison between both methods is given in terms of electric power output.Copyright © 2010 by ASME
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Experimental Investigations of Pressure Losses on the Performance of a Micro Gas Turbine System
Volume 3: Controls, Diagnostics and Instrumentation; Cycle Innovations; Marine, 2010Co-Authors: Jan Zanger, Axel Widenhorn, Manfred AignerAbstract:Pressure losses between the compressor outlet and the turbine inlet are a major issue of overall efficiency and system stability for a solid oxide fuel cell/micro gas turbine (MGT) hybrid power plant system. The goal of this work is the detailed analysis of the effects of additional pressure losses on MGT performance in terms of steady-state and transient conditions. The experiments were performed using the micro gas turbine test rig at the German Aerospace Centre in Stuttgart using a Butterfly Control Valve to apply additional pressure loss. This paper reports electric power and pressure characteristics at steady-state conditions as well as a new surge limit for this Turbec T100 micro gas turbine test rig. Furthermore, the effects of additional pressure loss on the compressor surge margin are quantified and a linear relation between the relative surge margin and additional pressure loss is shown. For transient variation of pressure loss at constant turbine speed, time delays are presented and an instability issue of the commercial gas turbine Controller is discussed. Finally, bleed-air blow-off and reduction of the turbine outlet temperature are introduced as methods of increasing the surge margin. It is quantified that both methods have a substantial effect on the compressor surge margin. Furthermore, a comparison between both methods is given in terms of electric power output. DOI: 10.1115/1.4002866
Jan Zanger - One of the best experts on this subject based on the ideXlab platform.
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experimental investigations of pressure losses on the performance of a micro gas turbine system
Volume 3: Controls Diagnostics and Instrumentation; Cycle Innovations; Marine, 2010Co-Authors: Jan Zanger, Axel Widenhorn, Manfred AignerAbstract:Pressure losses between compressor outlet and turbine inlet are a major issue of overall efficiency and system stability for a SOFC/MGT hybrid power plant system. The goal of this work is the detailed analysis of the effects of additional pressure losses on MGT performance in terms of steady-state and transient conditions. The experiments were performed at the micro gas turbine test rig at the German Aerospace Centre in Stuttgart using a Butterfly Control Valve to apply additional pressure loss. The paper reports electric power and pressure characteristics at steady-state conditions, as well as, a new surge limit, which was found for the Turbec T100 micro gas turbine. Furthermore, the effects of additional pressure loss on compressor surge margin are quantified and a linear relation between relative surge margin and additional pressure loss is shown. For transient variation of pressure loss at constant turbine speed time delays are presented and a compensation issue of the commercial gas turbine Controller is discussed. Finally, bleed-air blow-off and reduction of turbine outlet temperature are introduced as methods of increasing surge margin. It is quantified that both methods have a substantial effect on compressor surge margin. Furthermore, a comparison between both methods is given in terms of electric power output.Copyright © 2010 by ASME
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Experimental Investigations of Pressure Losses on the Performance of a Micro Gas Turbine System
Volume 3: Controls, Diagnostics and Instrumentation; Cycle Innovations; Marine, 2010Co-Authors: Jan Zanger, Axel Widenhorn, Manfred AignerAbstract:Pressure losses between the compressor outlet and the turbine inlet are a major issue of overall efficiency and system stability for a solid oxide fuel cell/micro gas turbine (MGT) hybrid power plant system. The goal of this work is the detailed analysis of the effects of additional pressure losses on MGT performance in terms of steady-state and transient conditions. The experiments were performed using the micro gas turbine test rig at the German Aerospace Centre in Stuttgart using a Butterfly Control Valve to apply additional pressure loss. This paper reports electric power and pressure characteristics at steady-state conditions as well as a new surge limit for this Turbec T100 micro gas turbine test rig. Furthermore, the effects of additional pressure loss on the compressor surge margin are quantified and a linear relation between the relative surge margin and additional pressure loss is shown. For transient variation of pressure loss at constant turbine speed, time delays are presented and an instability issue of the commercial gas turbine Controller is discussed. Finally, bleed-air blow-off and reduction of the turbine outlet temperature are introduced as methods of increasing the surge margin. It is quantified that both methods have a substantial effect on the compressor surge margin. Furthermore, a comparison between both methods is given in terms of electric power output. DOI: 10.1115/1.4002866
Axel Widenhorn - One of the best experts on this subject based on the ideXlab platform.
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experimental investigations of pressure losses on the performance of a micro gas turbine system
Volume 3: Controls Diagnostics and Instrumentation; Cycle Innovations; Marine, 2010Co-Authors: Jan Zanger, Axel Widenhorn, Manfred AignerAbstract:Pressure losses between compressor outlet and turbine inlet are a major issue of overall efficiency and system stability for a SOFC/MGT hybrid power plant system. The goal of this work is the detailed analysis of the effects of additional pressure losses on MGT performance in terms of steady-state and transient conditions. The experiments were performed at the micro gas turbine test rig at the German Aerospace Centre in Stuttgart using a Butterfly Control Valve to apply additional pressure loss. The paper reports electric power and pressure characteristics at steady-state conditions, as well as, a new surge limit, which was found for the Turbec T100 micro gas turbine. Furthermore, the effects of additional pressure loss on compressor surge margin are quantified and a linear relation between relative surge margin and additional pressure loss is shown. For transient variation of pressure loss at constant turbine speed time delays are presented and a compensation issue of the commercial gas turbine Controller is discussed. Finally, bleed-air blow-off and reduction of turbine outlet temperature are introduced as methods of increasing surge margin. It is quantified that both methods have a substantial effect on compressor surge margin. Furthermore, a comparison between both methods is given in terms of electric power output.Copyright © 2010 by ASME
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Experimental Investigations of Pressure Losses on the Performance of a Micro Gas Turbine System
Volume 3: Controls, Diagnostics and Instrumentation; Cycle Innovations; Marine, 2010Co-Authors: Jan Zanger, Axel Widenhorn, Manfred AignerAbstract:Pressure losses between the compressor outlet and the turbine inlet are a major issue of overall efficiency and system stability for a solid oxide fuel cell/micro gas turbine (MGT) hybrid power plant system. The goal of this work is the detailed analysis of the effects of additional pressure losses on MGT performance in terms of steady-state and transient conditions. The experiments were performed using the micro gas turbine test rig at the German Aerospace Centre in Stuttgart using a Butterfly Control Valve to apply additional pressure loss. This paper reports electric power and pressure characteristics at steady-state conditions as well as a new surge limit for this Turbec T100 micro gas turbine test rig. Furthermore, the effects of additional pressure loss on the compressor surge margin are quantified and a linear relation between the relative surge margin and additional pressure loss is shown. For transient variation of pressure loss at constant turbine speed, time delays are presented and an instability issue of the commercial gas turbine Controller is discussed. Finally, bleed-air blow-off and reduction of the turbine outlet temperature are introduced as methods of increasing the surge margin. It is quantified that both methods have a substantial effect on the compressor surge margin. Furthermore, a comparison between both methods is given in terms of electric power output. DOI: 10.1115/1.4002866
C. Oleśkowicz-popiel - One of the best experts on this subject based on the ideXlab platform.
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Investigations of Butterfly Control Valve flow characteristics
Foundations of Civil and Environmental Engineering, 2006Co-Authors: Janusz Wojtkowiak, C. Oleśkowicz-popielAbstract:Butterfly Valves are the most popular Control devices in ventilation and air conditioning systems. The results of experimental and numerical (CFD) investigations of a commonly used Valve having a thin-flat-sharp-edge disk and blockage ratio d/D = 0.947 have been presented. Flow characteristics, flow patterns and pressure distributions in the disk vicinity have beenshown and discussed. Steady-state, three-dimensional, laminar and turbulent flows (10 3 < Re < 2×10 4 ) have been analyzed. It is shown that the literature data differ considerably from our new experimental and numerical results. Based on the new results an improved flow characteristics equation K=f(d/D, α, Re) valid for d/D = 0.947 has been proposed.
Janusz Wojtkowiak - One of the best experts on this subject based on the ideXlab platform.
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Investigations of Butterfly Control Valve flow characteristics
Foundations of Civil and Environmental Engineering, 2006Co-Authors: Janusz Wojtkowiak, C. Oleśkowicz-popielAbstract:Butterfly Valves are the most popular Control devices in ventilation and air conditioning systems. The results of experimental and numerical (CFD) investigations of a commonly used Valve having a thin-flat-sharp-edge disk and blockage ratio d/D = 0.947 have been presented. Flow characteristics, flow patterns and pressure distributions in the disk vicinity have beenshown and discussed. Steady-state, three-dimensional, laminar and turbulent flows (10 3 < Re < 2×10 4 ) have been analyzed. It is shown that the literature data differ considerably from our new experimental and numerical results. Based on the new results an improved flow characteristics equation K=f(d/D, α, Re) valid for d/D = 0.947 has been proposed.
