孔板前后倾角对高速离心泵流场特性的影响

摘要

The method of changing the dip angle of orifice plate is proposed in order to study the effect of orifice plate type on the inlet vortex backflow of high speed centrifugal pump.25 different kinds of dip angle of orifice plate are designed and the flow field of a high-speed centrifugal pump is simulated based on ANSYS-CFX software.Three dip angle schemes that can improve the hydraulic performance of high-speed centrifugal pump are selected.The overall flow field of high-speed centrifugal pump,the changing of velocity vector,pressure and internal flow field are analyzed,and the performance curves of orifice plate with different dip angles are studied.The results show that orifice plates with-20°/10° dip angle can improve the backflow whirlpool of the inlet vortex backflow and control the swirling flow inside the idler,thus the hydraulic performance of high speed pump is improved.%为了更深入的研究孔板形式对高速离心泵进口段回流漩涡的影响,提出改变孔板前后倾角大小的方法,主要设计了25种不同倾角孔板的组合方案,利用电脑模拟软件ANSYS-CFX对某一高速离心泵进行全流场的数值模拟分析,从中选取了对高速离心泵水力性能提高较大的3种倾角方案,对比分析高速离心泵的整体的流线和进口段的速度矢量变化情况,诱导轮叶轮压力和内部流场的影响,并对不同倾角孔板的性能曲线进行分析.综合对比分析为:-20°/10°型孔板能较好的改善进口段的回流漩涡,抑制诱导轮内部的回旋流,对高速离心泵的水力性能有很大提高.