叶片进口几何参数对离心泵磨损规律的影响

Effects of Blade Entrance Geometrical Parameter on Centrifugal Pump Wear Rule

基于Mixture多项流模型和标注k-ε湍流模型,壁面处设置成无滑移壁面条件,运用Fluent软件对某双吸离心泵的全流道进行固液两相流的数值模拟。分析了离心泵进口处的固体颗粒的体积分数、固体颗粒的直径对离心泵叶片进口磨损的影响,并且在原叶轮的基础上对叶轮进行改进。研究表明,在一定范围内,减小叶轮中间流线处进口安放角可以改善叶轮的抗磨损性能,并且改变叶轮进口安放角对离心泵的扬程、效率的影响不大;叶片进口工作面的磨损量大于相同位置叶片背面处的磨损量,且叶片进口的磨损量从前盖板至后盖板呈递减趋势;随着颗粒直径的增加,叶片进口工作面的磨损加剧而叶片进口背面处的磨损减轻。

Based on Mixture multi flow model and marked k-εturbulence model,the wall was set by nonslipping;with Fluent,the whole flow passage of some double suction centrifugal pump was conducted with numerical simulation of solid liquid.We analyzed the effects of volume fraction and diameter of solid particles in the pump＇s entrance on wear of its blade entrance,and improved the impeller on the basis of primary impeller.It shows that increasing blade angle of middle flow line can improve anti-wear performance with little influence on its lift and efficiency;wear extent of blade entrance working surface is higher than that in the back of blade,and the wear extent is decreased from front cover board to back cover plate;with diameter of particles increasing,the wear in entrance working surface is increasing while decreasing in the back.