Investigation of the Effect of Engine Speed on the Radial Inflow Turbine for Automotive Exhaust Energy Recovery
Keywords:
Vaned Single-entry, Radial inflow turbine, Non-Pulsatile Flow, Numerical Simulation, Finite Volume, Computational Fluid Dynamics.Abstract
A computational fluid dynamic investigation of flow across a vaned single-entry radial inflow turbine coupled to an exhaust pipe of a 2.5L petrol engine was carried out to ascertain the extent of exhaust energy recoverability for driving the vehicle auxiliaries. A 3D model of the turbine cascade was developed, meshed and imported into Autodesk CFD. Appropriate boundary conditions for the simulation were specified assuming a 100% volumetric efficiency for the test engine at specified speeds. A steady non-pulsatile flow was modelled with volume flow rate inlet boundary condition while the outlet condition was specified as unknown in order to determine the properties of the flow and fluid spouting into the turbine from the engine. The turbulence model and advanced advection scheme were applied for the study. Results obtained provide insight to the variations of flow and fluid properties across the volute and outlet pipe at different engine speeds.
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