Study on Performance Improvement of the Radial Turbine for Turbochargers by Novel Design of the Variable Nozzle Vane Shape

Abstract

Variable Geometry System(VGS) turbochargers are widely applied to automotive diesel engines in order to improve the engine performance the design of a VGS turbine nozzle is crucial to ensure the engine requirement. In a current design of a VGS nozzle, two dimensional vane profile is commonly applied, but a three dimensional vane profile can be adopted due to the recent progress of a metallurgical technology. In this study, the effects of three dimensional VGS nozzle vane on turbine performance and aerodynamic force of nozzle vane, which will affect controllability of boost pressure, are investigated numerically and experimentally.