Browse Publications Technical Papers 2011-36-0081
2011-10-04

Automotive Turbocharger Radial Turbine CFD and Comparison to Gas Stand Data 2011-36-0081

Nowadays, most diesel engines are turbocharged. This component was proved of great importance to bring power and torque levels of diesel engines to those of its gasoline counterparts. Also, turbochargers help diesel engines achieve the most strict emissions levels. The design of more effective turbocharger components provides more room for increased engine performance levels.
This study evaluates the performance of a radial inflow turbine typically used in commercial diesel engine turbochargers. The CFD commercial code Ansys CFX 11.0 was used to reproduce the operating environment seen in Gas Stands to obtain the performance map of such radial turbines. Only volute and radial turbine geometries were meshed and simulation was run as adiabatic and steady-state. The turbulence model κ-ω SST was chosen for calculations. All simulations were in good agreement with experimental results from Gas Stand testing from the point of view of mass flow parameter. A shift in efficiency was expected due to divergences between data measurement and calculation using CFD.
The main motivator of this work is to develop a methodology for running CFD calculations for future predictions of the trend that geometrical changes on the turbine mass flow parameter and efficiency.

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