ABSTRACT
Turbochargers performance maps need to be extrapolated by automotive manufacturers: experimental techniques could be difficult and extrapolation models could be too simplified. A CFD model is presented with a reduced calculation time and power required for a radial turbine complete performance map: mass flow rate and efficiency. The turbine is studied as an entire system without separating the different components. The calculation is carried with a non-moving rotor mesh and extended to the negative mass flow rate region. The tendency of the efficiency curves is studied as a function of the turbine expansion ratio and the blade speed ratio.
Keywords: Turbocharger, radial turbine, simulation, CFD, performance map, extrapolation, mass flow rate, efficiency.
