大型立式轴流泵水力模型导叶改型及试验验证

Modification and experimental verification of guide vaneshydraulic model for large vertical axial-flow pumps

为改善轴流泵导叶与叶轮的匹配性,以某立式轴流泵装置为研究对象,通过正交试验对水力模型导叶改型,应用计算流体动力学软件和模型试验,对匹配不同导叶的轴流泵水力模型进行比对和优选.研究结果表明:数值计算结果与模型试验结果的最大误差小于5%,性能曲线的整体趋势相对良好,数值计算方法合理可靠;在设计流量工况下,优化后的导叶能够减小导叶体的水力损失及导叶出口环量,动能回收效果较好,在有效降低设计扬程的同时保证泵站以80.7%的效率高效运行;不同导叶对立式轴流泵装置的性能有明显影响,优化后的导叶能够改变装置设计流量,使泵装置高效区向大流量偏移,同时提高小流量工况下泵的装置扬程,降低大流量工况下的装置扬程.

In order to improve the matching between the guide vanes and impellers of the axial-flow pumps,a vertical axial-flow pump was taken as the research object.The guide vane of the hydraulic models were modified by an orthogonal experiments.The hydraulic models of axial-flow pumps with different guide blades were compared and optimized by using computational fluid dynamics software(CFD)and model tests.The results show that the maximum error between the numerical calculation results and the model test results is less than 5%.The overall trend of the performance curve is relatively good.The numerical calculation method is reasonable and reliable.Under the design flow condition,the optimized guide vane can reduce the hydraulic loss of the guide vane body and the outlet circulation of the guide vane,and the kinetic energy recovery effect is better.It can effectively reduce the design head and ensure the efficient operation of the pump station with 80.7%efficiency.Different guide vanes have a significant impact on the performance of the vertical axial-flow pump device.The optimized guide vanes can change the design flow rate of the device,so that the efficient area of the device is biased towards large flow rate.And the optimized guide vanes simultaneously increase the device head of the pump under small flow conditions and reduce the device head under large flow conditions.