Model of Aerodynamics and Heat Transfer of a Turbocharger

Autor*innen

• Xunan Gao

Parameter

• Technologie & Industrie

Mehr zum Buch

This thesis focuses on modeling the aerodynamics and heat transfer of a turbocharger for passenger cars, aiming to quantify heat transfer and enhance 1D simulation by incorporating heat transfer effects. The first part involves a measurement study on a turbocharger at a hot gas test bench, assessing aerodynamic characteristics and heat transfer behavior under adiabatic and diabatic conditions. The second part conducts a numerical analysis of heat transfer using conjugate heat transfer (CHT) simulations for both the turbine and compressor. A novel combined-CHT approach is introduced for the turbine, improving external convection resolution while maintaining computational efficiency, resulting in reliable heat transfer modeling comparable to traditional single-CHT simulations. For the compressor, the analysis reveals that measured efficiency can be up to 15 percent lower than the actual value due to heat transfer effects. The final part develops a new 1D/3D-FEM model, integrating a 1D flow field model with a 3D FEM model for the turbine and compressor housings. This model accounts for heat transfer in typical engine simulations, yielding comparable estimates for turbo speeds and compressor outlet temperatures while significantly reducing errors in turbine outlet temperature predictions. The 1D/3D-FEM model is anticipated to be applicable across various turbocharger configurations and operating scenarios.

• Sprache: Englisch
• Erscheinungsdatum: 2019