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Energies 2018, 11(2), 269;

An Investigation on the Efficiency Correction Method of the Turbocharger at Low Speed

Department of Mechanical Engineering, Korea University of Technology and Education, Chungnam 31253, Korea
Green Car Power System R & D Division, Korea Automotive Technology Institute, Chungnam 31214, Korea
R & D Center, Keyyang precision Co. LTD, Gyeongsangbuk 39537, Korea
Author to whom correspondence should be addressed.
Received: 14 December 2017 / Revised: 12 January 2018 / Accepted: 16 January 2018 / Published: 23 January 2018
(This article belongs to the Section Energy Fundamentals and Conversion)
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The heat transfer in the turbocharger occurs due to the temperature difference between the exhaust gas and intake air, coolant, and oil. This heat transfer causes the efficiency of the compressor and turbine to be distorted, which is known to be exacerbated during low rotational speeds. Thus, this study proposes a method to mitigate the distortion of the test result data caused by heat transfer in the turbocharger. With this method, the representative compressor temperature is defined and the heat transfer rate of the compressor is calculated by considering the effect of the oil and turbine inlet temperatures at low rotation speeds, when the cold and the hot gas test are simultaneously performed. The correction of compressor efficiency, depending on the turbine inlet temperature, was performed through both hot and cold gas tests and the results showed a maximum of 16% error prior to correction and a maximum of 3% error after the correction. In addition, it shows that it is possible to correct the efficiency distortion of the turbocharger by heat transfer by correcting to the combined turbine efficiency based on the corrected compressor efficiency. View Full-Text
Keywords: turbocharger; compressor; efficiency; low speed; correction turbocharger; compressor; efficiency; low speed; correction

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Chung, J.E.; Chung, J.W.; Kim, N.H.; Lee, S.W.; Kim, G.Y. An Investigation on the Efficiency Correction Method of the Turbocharger at Low Speed. Energies 2018, 11, 269.

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