离心式空气压缩机叶轮内湍流的数值模拟

Numerical Simulation of the Centrifugal Air Compressor Impeller Turbulence

应用粘性标准两方程湍流模型、三维雷诺时均N-S方程,采用非定常数值模拟方法,研究了带分流叶片离心式空气压缩机叶轮内部的流场分布情况。研究结果表明,压力面的静压大于相应位置吸力面的压力,最大静压位于压力面后缘;最大相对速度位于叶片入口,长叶片吸力面有回流现象,短叶片对遏止回流有明显作用;长叶片压力面前缘压力非定常波动最严重,后缘其次,叶片中部的压力波动最弱。该项研究成果可应用于叶轮结构的优化设计及指导叶轮的再制造。

Applying the viscous criterion two-equation turbulence model and the Reynolds time-averaged N-S e- quation, the unsteady numerical simulation method was used to study the distribution of the flow field inside the im- peller of centrifugal air compressor with splitter blade. The research findings show that the static pressure of pressure surface is larger than the pressure of suction surface at the corresponding place. The maximum static pressure is lo- cated on the trailing edge of pressure surface. The maximum relative velocity is located at impeller inlet. There is backflow on the long impeller suction surface. The short blade has remarkable effect on prevention of backflow. The unsteady fluctuation of pressure on the front of long impeller pressure face is most serious; next to it is that on the trailing edge. The pressure fluctuation in the middle of impeller is the weakest. The researeh achievement can be ap- plied to the design optimization of impeller structure and serve as a guide to the re-manufacture of impeller.