压缩机旋转失速发展传播的计算分析

Calculation and Analysis of the Rotating Stall Development and Dissemination in a Compressor

针对实际运行过程中某型压缩机首级叶轮叶片断裂的问题,利用CFD软件Numeca搭建一个基于完整真实的三维几何结构的离心压缩机内部流场数值分析平台,选用实际运行工况进行计算,发现由于进气室和进气导叶的设计存在一定的问题,导致首级叶轮前的流场畸变,从而诱发压缩机首级叶轮失速;通过进行非定长流动计算,动态模拟了旋转失速的发展传播过程,得到了比较真实的旋转失速的压力脉动情况,为该机组产品的叶轮叶片断裂问题的研究找到一个突破口,并为进一步研究分析提供了充足的数据资料。

In the light of a blade fracture problem occurring to the first impeller of a compressor during its operation,set up was an inner flow field numerical-analytic platform based on a centrifugal compressor with an entire and true three-dimensional geometrical structure by using CFD (Computational Fluid Dynamics) software Numeca.A calculation was performed by choosing practical operating conditions.It has been found that a definite problem existing in the design of the air inlet chamber and guide vanes leads to a distortion of the flow field before the first-stage impeller,triggering a stall of the impeller in the compressor.Through an unsteady flow calculation,the development and dissemination process of the rotating stall was dynamically simulated and a relatively true pressure fluctuation caused by the rotating stall,obtained.As a result,a breakthrough for the study of blade fracture problems of the compressor unit was attained,offering sufficient data and information for further investigation and analysis.