Performance Evaluation of a Multi-stage Axial Flow Turbocharger Turbine

Abstract

- This paper focuses on designing a multi-stage axial flow turbocharger turbine as a suitable
alternative for some applications to a traditional radial turbine. Also, multi-stage turbine technology is
integrated into the axial flow turbine to further improve both performance and efficiency. Through
computational fluid dynamic simulation, the design and optimisation of the inlet stator and rotor blades for
the axial inflow turbine was developed. Multi-stage CFD techniques are proposed to the last stator
throughout the three-dimensional redesign process to investigate its capability for aerodynamic
enhancement. Required data were collected for engine modelling under different flow conditions to evaluate
the turbocharger turbine output achieved through the application of multi-stage axial turbine, which reached
a high isentropic efficiency of 86.73 percent at 100 krpm. Different initial designs have been studied through
computational fluid dynamic simulations and the configuration selected has been further improved to
increase overall stage performance. Turbocharger turbine model simulations demonstrated that the proposed
multi-stage axial turbocharger turbine dramatically improves performance and efficiency.