In most compressors the flow is adiabatic, but in low-speed turbochargers, the compression process has both heat transfer and work input. This paper examines different compressor efficiency definitions for such diabatic flows. Fundamental flaws in the use of the isentropic efficiency for this purpose are identified, whereas the polytropic efficiency can be used with or without heat transfer without ambiguities. The advantage of the polytropic approach for a practical application is demonstrated by analyzing the heat transfer in a turbocharger compressor. A simple model of the heat transfer allows a correction for this effect on the polytropic efficiency at low-speed to be derived. Compressor characteristics that have been corrected for this surprisingly large effect maintain a much higher efficiency down to low-speeds.
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July 2010
Research Papers
The Efficiency of Turbocharger Compressors With Diabatic Flows
Michael V. Casey,
Michael V. Casey
Institute of Thermal Turbomachinery and Machinery Laboratory (ITSM),
Universität Stuttgart
, Pfaffenwaldring 6, D-70569 Stuttgart, Germany
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Thomas M. Fesich
Thomas M. Fesich
Institute of Thermal Turbomachinery and Machinery Laboratory (ITSM),
Universität Stuttgart
, Pfaffenwaldring 6, D-70569 Stuttgart, Germany
Search for other works by this author on:
Michael V. Casey
Institute of Thermal Turbomachinery and Machinery Laboratory (ITSM),
Universität Stuttgart
, Pfaffenwaldring 6, D-70569 Stuttgart, Germany
Thomas M. Fesich
Institute of Thermal Turbomachinery and Machinery Laboratory (ITSM),
Universität Stuttgart
, Pfaffenwaldring 6, D-70569 Stuttgart, GermanyJ. Eng. Gas Turbines Power. Jul 2010, 132(7): 072302 (9 pages)
Published Online: April 21, 2010
Article history
Received:
June 17, 2009
Revised:
June 18, 2009
Online:
April 21, 2010
Published:
April 21, 2010
Citation
Casey, M. V., and Fesich, T. M. (April 21, 2010). "The Efficiency of Turbocharger Compressors With Diabatic Flows." ASME. J. Eng. Gas Turbines Power. July 2010; 132(7): 072302. https://doi.org/10.1115/1.4000300
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