基于ANSYS CFX的車用渦輪增壓機(jī)壓氣機(jī)渦管計算機(jī)優(yōu)化模擬分析

雷汝婧　周天俊

摘 要：運(yùn)用ANSYS CFX軟件對渦輪增壓器壓氣機(jī)渦管內(nèi)流體進(jìn)行運(yùn)動仿真。使用3D模型軟件對基本型號的小型車用渦輪增壓器壓氣機(jī)進(jìn)行3D模型建模，建立出適合流體仿真的流體域3D模型;對渦管內(nèi)的壓力分布、速度分布、壓力恢復(fù)指數(shù)分布以及總壓力損失指數(shù)分布等參數(shù)進(jìn)行分析，找到設(shè)計上的不足并予以改進(jìn);通過改進(jìn)基本型模型的渦管截面形狀，使得渦管內(nèi)部的紊流減少，渦管壓力恢復(fù)指數(shù)得以提高，總壓力損失指數(shù)得以減少，從而提高壓氣機(jī)的進(jìn)氣壓力并獲得更好的速度矢量分布，使渦輪增壓器壓氣機(jī)的工作效率提高。

關(guān)鍵詞：渦輪增壓器 壓氣機(jī) 渦管 壓力恢復(fù)指數(shù) 總壓力損失指數(shù)

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