Heat transfers in an automotive turbocharger comprise significant energy flows, but are rarely measured or accounted for in any turbocharger performance assessment. Existing measurements suggest that the difference in turbine efficiency calculated in the conventional way, by means of the fluid temperature change, under adiabatic conditions differs considerably from the usual diabatic test conditions, particularly at low turbine pressure ratio. In the work described in this paper, three commercial turbochargers were extensively instrumented with thermocouples on all accessible external and internal surfaces in order to make comprehensive temperature surveys. The turbochargers were run at ranges of turbine inlet temperature and external ventilation. Adiabatic tests were also carried out to serve as a reference condition. Based on the temperature measurements, the internal heat fluxes from the turbine gas to the turbocharger structure and from there to the lubricating oil and the compressor, and the external heat fluxes to the environment were calculated. A one-dimensional heat transfer network model of the turbocharger was demonstrated to be able to simulate the heat fluxes to good accuracy, and the heat transfer coefficients required were ultimately found to be mostly independent of the turbochargers tested.
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April 2010
Research Papers
The Analysis of Heat Transfer in Automotive Turbochargers
Nick Baines,
Nick Baines
Concepts NREC
, 23 Banbury Road, Oxford OX2 6NX, UK
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Karl D. Wygant,
Karl D. Wygant
Concepts NREC
, 217 Billings Farm Road, White River Junction, VT 05001-9486
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Antonis Dris
Antonis Dris
Technology & Solutions Division, Engine Technologies Europe,
Caterpillar Inc.
, Peterborough PE1 5NA, UK
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Nick Baines
Concepts NREC
, 23 Banbury Road, Oxford OX2 6NX, UK
Karl D. Wygant
Concepts NREC
, 217 Billings Farm Road, White River Junction, VT 05001-9486
Antonis Dris
Technology & Solutions Division, Engine Technologies Europe,
Caterpillar Inc.
, Peterborough PE1 5NA, UKJ. Eng. Gas Turbines Power. Apr 2010, 132(4): 042301 (8 pages)
Published Online: January 25, 2010
Article history
Received:
March 22, 2009
Revised:
May 24, 2009
Online:
January 25, 2010
Published:
January 25, 2010
Citation
Baines, N., Wygant, K. D., and Dris, A. (January 25, 2010). "The Analysis of Heat Transfer in Automotive Turbochargers." ASME. J. Eng. Gas Turbines Power. April 2010; 132(4): 042301. https://doi.org/10.1115/1.3204586
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