灯泡贯流泵装置水力模型设计研究

Hydraulic Model Design Study of Bulb Tubular Pump Device

该文对后置灯泡贯流泵装置的水力设计进行了研究。先结合CFD方法,分析几何参数变化对装置外特性和流动特性的影响,将其作为一个整体考虑提出了设计方法。然后参考已有的设计方法,通过合理地给定叶轮出口环量和轴面速度的分布来进行泵段设计,并基于CFD流场分析调整泵段设计参数以有效提高泵段水力性能。在此基础上,结合流道水力设计方法,完成对装置水力模型的初步设计,并以装置性能最优为目标,研究流道水力参数的优化。分析导叶叶片数和灯泡体尾部缩角对装置性能的影响,优化导叶和灯泡体的水力设计。通过分析装置几何参数变化对装置外特性和内部流场的影响,完成对后置灯泡贯流泵装置水力模型的设计。经CFD性能预测,在设计工况(1.0Q)下,模型的装置扬程为5.45m,装置效率达到83.13%,临界空化余量约为6.4 m。

In this paper,the hydraulic design of a post-bulb tubular pump device is studied.Combined with the CFD method,the effect of geometric parameter changes on the external characteristics and flow characteristics of the device is analyzed,and the design method of the device is proposed by considering the device as a whole.Concerning the existing design methods,the pump section design is carried out by reasonably giving the distribution of impeller outlet ring volume and shaft surface velocity,and the pump section design parameters are adjusted based on CFD flow field analysis to effectively improve the hydraulic performance of the pump section.On this basis,the preliminary design of the hydraulic model of the device is completed by combining the flow channel hydraulic design method.The influence of the number of guide vane blades and the tail angle of the bulb body on the performance of the device is analyzed,and the hydraulic design of the guide vane and the bulb body is optimized.By analyzing the effect of the change of device geometric parameters on the external characteristics and internal flow field of the device,the design of the hydraulic model of the post bulb tubular pump device is completed.The CFD performance prediction shows that the model device head is 5.45 m at the design condition(1.0Q),and the device efficiency reaches 83.13%with a critical cavitation margin of about 6.4 m.