后置灯泡式贯流泵装置模型的优化与试验研究

Optimization and experimental investigation on post bulb type tubular pump device model

结合南水北调东线工程金湖泵站低扬程大流量工况要求,研制了贯流泵装置水力模型。采用标准k-ε湍流模型和SIMPLEC算法,对该模型进行了全流场数值模拟,并对叶片出口和导叶之间的距离进行了优化。优化结果表明,当叶片出口和导叶之间距离为0.11倍叶轮外径时,内部流动较稳定,装置效率高;当该距离为0.03和0.33倍叶轮外径时,导叶出口分别形成了脱流区和旋涡区。流线运动轨迹表明导叶出口存在一定的剩余环量,呈螺旋流态进入出水流道,没有出现局部旋涡。优化后的装置模型经过3个不同试验台的试验,结果基本相符。试验结果表明,该模型流量大,效率高,在-4°叶片角下,最高效率达到79.40%;在2.92m扬程下,流量为329L/s,汽蚀比转速为1267,效率达到79.15%,该模型可供南水北调工程及其他工程选用。

The low head and large flow rate condition is requested in Gold Lake Pumping Station in the East Route of South-to-North Water Diversion Project,and the numerical study on optimization and hydraulic model test on the tubular pump for this pumping station were carried out.The flow regions including inlet,rotor,and guide-vane and outlet channel were simulated based on standard [k-ε] turbulence model and SIMPLEC arithmetic,and the matching relation between rotor and guide-vane was optimized.The numerical results show that the device model has a steady flow and high efficiency when the distance between blade exit and guide-vane inlet equals 0.11 diameter of impeller.The results of model test show that the efficiency of the tubular pump reaches 79.40% at blade angle of-4°.At the condition of water head equal to 2.92m,its flow rate reaches 329 L/s,efficiency reaches 79.15%,and the cavitations specific speed reaches 1267.The device has obvious advantages when the operating head is less than 3m.