Performance of a Twin Scroll Turbine for an Automotive Turbocharger Under Full-Admission and Partial-Admission

Abstract

Aerodynamic performance of a twin scroll turbine was investigated under full-admission and partial-admission using steady CFD (Computational Fluid Dynamics). The CFD result shows good agreement with the experimental result quantitatively in terms of mass flow, and qualitatively in terms of efficiency. As for the flow field of CFD results, it is shown that the loss occurring downstream of the rotor inlet mainly makes the difference of the performance characteristics of each condition. Moreover, in the case of partial-admission, the flow back to non-inflow passage also generates the large loss.