离心压缩机内固粒运动规律与冲蚀磨损的数值模拟

针对离心压缩机叶轮的冲蚀磨损问题,利用FLUENT中离散相模型、质量冲蚀率模型,对压缩机内部不同粒径的固体颗粒的运行轨迹、运动速度、偏聚浓度及造成的叶片冲蚀率的分布进行了数值模拟。结果表明:粒径为5~20μm的绝大部分的固体颗粒流经大叶片压力面附近流道;固体颗粒在运动到叶片前缘过程中速度迅速升高,在压力面腹侧会有所减小,后缘处重新升高;大叶片后缘根部固体颗粒浓度高、运行速度快,冲蚀磨损严重,且固体颗粒直径越大对大叶片压力面造成的冲蚀磨损越严重。

Numerical Simulation of Solid Particle Motion and Erosion Within a Centrifugal Compressor

To study the solid particle erosion of the blades in the centrifugal compressor,based on discrete phase model,Finnie ductile materials erosion model of FLUENT software,the motion trajectory,motion speed and mass concentration of solid particles and the erosion rate of the blades were simulated successfully. According to the simulation results,when the diameter ranges from5μm to 20μm,most of the solid particles flow through the flow channel near the pressure surface of the large blade. Before arriving at the front edge,the particle speed increases quickly,but during the process of running to the rear edge of the blade,the speed first reduces and then increases. At the rear edge of the large blade where concentration and speed of solid particles are high,the maximum erosion rate appears. And particles with larger diameter cause more serious erosion wear to the pressure surface.