In order to analyze the influence of inlet/exhaust volutes of turbocharger turbine component on turbine stage performance and the interaction mechanism

and improve turbine efficiency

numerical simulation was used to optimize the design of the intake/exhaust casing in the turbocharger. The optimization scheme of the intake volute and the exhaust volute was proposed

and the calculation was combined with the entire turbine to compare and analyze the performance of the entire turbine. The results show that the intake volute mainly affects the inlet angle of attack of the stator with 10% blade height

and the optimization scheme can provide better inlet conditions for the turbine. The exhaust volute mainly affects the load distribution of the trailing edge of the rotor. The optimization scheme can increase the working ability of the turbine

so the optimization design of the intake/exhaust volute can improve the total static efficiency of the whole machine by 1.19%.