离心压缩机中间级内流动数值研究

NUMERICAL INVESTIGATION OF THE FLOW IN A CENTRIFUGAL COMPRESSOR INTERMEDIATE STAGE

本文采用数值方法对多级离心压缩机中间级内的流动进行了研究，重点考察了进口段、弯道和回流器对中间级气动性能的影响，发现与进口段相比弯道和回流器内的流动损失较小，并且回流器出口气流的扰动作用使得级的喘振流量减小。本文还研究了增大回流器叶片出口安装角对压缩机压比及效率的影响。

Numerical simulation is applied to investigate the flow in the intermediate stage of a multistage centrifugal compressor. The effects of the inducer, bend duct and return channel on the performance of the stage are intensively investigated. The results show that the losses in the bend duct and the return channel is much smaller than that in the inlet part, and that the disturbance of the flow from the deswirl exit reduces the surge flow rate of the intermediate stage. Besides, the influences of the outlet setting angle of the deswirl blades to the stage efficiency and pressure ratio are explored.