The exhaust gas spouting from the exhaust manifold into the radial inflow turbine coupled to
an exhaust pipe of a 2.5L petrol engine has been computationally simulated in order to ascertain the extent
of exhaust energy recoverability for driving the vehicle auxiliaries, using Autodesk CFD. In order to
determine the amount of power available at the turbine shaft at varying engine speeds, properties of the
flow and fluid spouting into the turbine from the engine and out of the turbine from the volute outlet were
examined by applying the πππ π β π turbulence model and advanced πππ‘πππ£ β πΊπππππππβ²π advection
scheme. For the test engine used with the operating range of 2000-6000rpm, at engine speeds up to
3000rpm, the available power was about 0.3kW. At 4000rpm, about 2.8kW of power is available at the
turbine shaft, increasing to 7.7kW at 5000rpm and 43.6kW at 6000rpm. Curve-fitting shows that at
5500rpm, as much as 15kW reversible power can be extracted from a shaft coupled to the turbocharger
turbine. With an electrically-assisted turbine component of the turbocharger used, the compressor of
vapour compression refrigeration system of the vehicle will be efficiently driven at all engine speeds while
exhaust energy recovery is achieved
