流体机械

2020, v.48;No.576(06) 31-37+19

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高速离心泵平衡孔比面积对其性能的影响
Effect of Balancing Hole Specific Area on Performance of High Speed Centrifugal Pump

程效锐;常正柏;
Cheng Xiaorui;Chang Zhengbai;College of Energy and Power,Engineering,Lanzhou University of Technology;Key Laboratory of Fluid Machinery and Systems of Gansu Province;

摘要(Abstract):

为了研究高速离心泵平衡孔对其内外特性及转子轴向力的影响,以一台转速为30 000 r/min的高速离心泵为研究对象,利用N-S方程及RNG k-ε湍流模型进行全流场数值计算。研究结果表明,当比面积0.5≤k≤5时,随着比面积的增大,高速离心泵扬程H下降2.4%,效率η下降3.4%,轴功率P上升3.8%;当比面积3≤k≤5时,高速离心泵平衡孔内流动产生漩涡,对主流产生较大的影响。随着平衡孔比面积的增大,平衡孔泄漏量增大,最大泄漏量可达设计流量的23%。比面积变化对高速离心泵转子轴向力的大小和方向均有显著影响,当比面积k<1时,转子轴向力方向指向离心轮进口;当比面积k≥1时,转子轴向力背离离心轮进口;当比面积k=1时,平衡孔可有效地平衡转子轴向力。
In order to study the influence of the balancing hole of the high-speed centrifugal pump on its internal and external characteristics and the axial force of the rotor,a high-speed centrifugal pump with a rotating speed of 30 000 r/min was used as the research object,and the full flow field was calculated using N-S equation and RNG k-ε turbulence model.The research results show that when the specific area is 0.5≤k≤5,with the increase of the specific area,the head of the high-speed centrifugal pump is decreased by 2.4%,the efficiency is decreased by 3.4%,and the shaft power is increased by 3.8%.When the specific area is 3≤k≤5,a vortex is generated in the balancing hole of the high-speed centrifugal pump,which has a great influence on the mainstream.With the increase of the area of the balancing hole,the leakage amount of the balance hole increases,and the maximum leakage amount can reach 23% of the design flow.The change of specific area has a significant influence on the magnitude and direction of axial force on the rotor of high speed centrifugal pump.When the specific area is k<1,the axial force of the rotor points to the inlet of the centrifugal wheel;when the specific area is k≥1,the axial force of the rotor deviates from the inlet of the centrifugal wheel;when the specific area is k=1,the balancing hole can effectively balance the axial force of the rotor.

关键词(KeyWords): 高速离心泵;平衡孔;轴向力;泄漏量
high speed centrifugal pump;balancing hole;axial force;leakage amount

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作者(Author): 程效锐;常正柏;
Cheng Xiaorui;Chang Zhengbai;College of Energy and Power,Engineering,Lanzhou University of Technology;Key Laboratory of Fluid Machinery and Systems of Gansu Province;

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