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

International audienceWe present 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 efficiencies fit well for values of turbine inlet temperatures of 600°C. For other temperatures the differences between the determined values and CHT are greater. e differences rise with higher temperatures. Hence, an additional dependency of turbine inlet temperatures has been implemented in the model. The modification has shown better results and smaller differences to CHT results. Especially at low speeds where the former approach has had big differences the modification improves the distribution. A wastegate turbocharger has been investigated from small gasoline engine applications. In future investigations the approach will be tested on the compressor with a modification, too, as well as on different turbochargers. The objective is to create a methodology for parameterization of a thermal network model based on the modified approach as a start point. Recently the experimental basis has been developed to determine heat flows on radial turbines and compressors. It has been validated for the compressor with experimental data under near adiabatic conditions. For the turbine a CFD simulation has been carried out. Both comparisons have shown good results for turbine inlet temperatures of 600°C