基于CFD的汽油机电动增压压气机叶轮结构优化

Optimization of Impeller Structure of Gasoline Engine Electric Booster Compressor Based on CFD

电动增压压气机具有良好的响应特性与工况适应性,越来越受到厂家的重视。利用计算流体力学(computational fluid dynamics,CFD)对离心式压气机的内部流场进行模拟仿真,建立了某型压气机的三维流场模型,分析了压气机典型工况下分流叶片的作用及其对压气机压比的影响,从而对叶轮结构进行优化。结果表明:对于试验中的压气机,采用分流叶片可以抑制附面层分离,在转速为10000 r·min^(-1)条件下,带分流叶片的压气机压比比不带分流叶片的压气机压比增加了12.67%,从而提高了压气机的性能。

Electric booster compressors have good response characteristics and adaptability to working conditions,and are more and more valued by manufacturers.In this paper,the computational fluid dynamics is employed to simulate the internal flow field in the centrifugal compressor and to establish a three-dimensional flow field model of a certain type of compressor.The effect of the splitter blades under typical compressor conditions and their influence on the compressor pressure ratio are analyzed to optimize the structure of compressor impeller.The results show that for the compressor in the paper,the use of splitter blades can suppress the separation of the boundary layer,and at a speed of 10000 r·min^(-1),the pressure ratio of the compressor increases 12.67%more than that of the compressor without the splitter blades,which obviously improves the compressor performance.