Turbocharger Heat Transfer Determination with a Power Based Phenomenological Approach and a CHT Validation

[+] Author and Article Information
Bojan Savic

Department of Powertrain Technologies, Technical University Berlin, Germany

Xunan Gao

Department of Powertrain Technologies, Technical University Berlin, Germany

Roland Baar

Department of Powertrain Technologies, Technical University Berlin, Germany

1Corresponding author.

ASME doi:10.1115/1.4041806 History: Received February 15, 2018; Revised October 16, 2018


We present here from our work on models to determine heat flows on turbochargers. A Conjugate- Heat-Transfer simulation has been carried out on the turbine for validation of the approach. Results have shown that isentropic effciencies fit well for values of turbine inlet temperatures of 600°C. For other temperatures the differences between the determined values and CHT are greater. The differences rise with higher temperatures generally. Hence, an additional dependency of turbine inlet temperatures has been implemented in the approach. The modifcation has shown better results and smaller differences to CHT results. Especially at low speeds where the former approach has had big differences the modifcation improves the distribution for various turbine inlet temperatures. A wastegate turbocharger has been investigated from a small gasoline engine. In future investigations the approach will be tested on the compressor with a modifcation, too. The overall objective is to create a methodology for parameterization of a thermal network model based on the modifed approach as a start point. Recently the basis was developed to determine heat flows on radial turbines and compressors. Further, it was validated for the compressor with experimental data under near adiabatic conditions. For the turbine a CFD simulation was carried out. Both comparisons showed good results for turbine inlet temperatures of 600°C.

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