Experimental study and numerical modelling of a pulsed flow radial turbine pulsed flow
Résumé:
Reducing the environmental footprint of the internal combustion engine is a global challenge. Turbochargers help to reduce CO2 emissions. This study focuses on an experimental approach to test and optimize turbocharger, considering the pulsating flow within the turbine stage. A pulsating flow generator is used on a turbocharger test rig to reproduce engine-like flow: hot and pulsating. The part upstream of the turbine is designed to replicate the secondary flows inherent to the engine’s exhaust manifold. Three operating points are investigated. They are located on the engine’s full load curve, at low rotational speed. A computational fluid mechanics (CFD) simulation of pulsating flow within a radial turbine enhances and completes the experimental results. An in-depth study of the flow structure within the turbine stage highlights the impact of pulsating flow on turbine performance.