基于ANSYS CFX的车用涡轮增压机压气机涡管计算机优化模拟分析

雷汝婧　周天俊

摘 要：運用ANSYS CFX软件对涡轮增压器压气机涡管内流体进行运动仿真。使用3D模型软件对基本型号的小型车用涡轮增压器压气机进行3D模型建模，建立出适合流体仿真的流体域3D模型;对涡管内的压力分布、速度分布、压力恢复指数分布以及总压力损失指数分布等参数进行分析，找到设计上的不足并予以改进;通过改进基本型模型的涡管截面形状，使得涡管内部的紊流减少，涡管压力恢复指数得以提高，总压力损失指数得以减少，从而提高压气机的进气压力并获得更好的速度矢量分布，使涡轮增压器压气机的工作效率提高。

关键词：涡轮增压器 压气机 涡管 压力恢复指数 总压力损失指数

Computational Fluid Simulation Analysis of the Automotive Turbocharge Compressor Volute Based on ANSYS CFX

Lei Rujing Zhou Tianjun

Abstract：Investigating the compressor volute now is a popular way to research the turbocharge. Analysis the CFD results help to modify the shape of volute cross section to improve the pressure ratio and efficiency. In this paper， the ANSYS CFX is used to simulation of the flow inside the volute. First， the compressor 3D model is established which by using 3D software includes the impeller， diffuse and volute， and then making the fluid domain for the simulation. After setting the boundary condition at the compressor design point， the simulation is started. When getting the results which have pressure， velocity vector， pressure recovery coefficient and total pressure loss coefficient， the disadvantage of the basic model is analyzed. Making the modification model which change the shape of the volute cross-section can decrease the vortex inside the volute. The modification model succeeds in increasing the pressure ratio and pressure recovery coefficient. The new turbocharge compressor performance is improved by using the modification volute.

Key words：turbocharge， compressor， volute， pressure recovery coefficient， total pressure loss coefficient