折边对旋流泵性能影响的数值计算与试验

为提高旋流泵的扬程和效率,进行了折边对旋流泵性能影响的数值模拟与试验研究.通过对3种具有不同折边大小的叶片的水力性能进行对比,分析折边对旋流泵性能的影响.采用Pro/E造型和非结构化网格,把旋流泵无叶腔和叶轮作为一个整体来模拟旋流泵内部三维不可压湍流场.数值模拟计算选取工作介质为清水.计算结果表明,旋流泵内部存在较强的纵向旋涡和轴向旋涡,折边可以改善旋流泵内部流动情况,限制径向转为轴向的循环流动;通过对比试验讨论了折边对旋流泵性能的影响,试验结果表明,扬程提高3.64 m,效率提高近7.0%,折边能够减小水力损失,提高旋流泵的扬程和效率.

Numerical simulation and experiment of influence of hem on performance of vortex pump

In order to improve the head and efficiency of vortex pumps,numerical simulation and experimental research of influence of hems on performance of a vortex pump was carried out.Something was got by contrasting three kinds of blades with different sizes hems on performance of the pump.The model was designed by Pro/E considering impeller and volute as a whole and with unstructured grid generation technique.The numerical results by contrasting the calculated values of three different hems show that the internal flow includes longitudinal and transverse vortices,and hems can improve the flow patterns inside the pump and restrict the transformation of radial flow to axial one.The influence of hems on vortex pump′s performance was discussed.The experimental results show that the head increases by 3.64 m and the efficiency increases by 7.0%.The research shows that hem can reduce the loss of hydraulic and improve head and efficiency.