高速离心泵平衡孔轴面安放角对其性能的影响

为研究高速离心泵平衡孔轴面安放角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。结果表明:随着轴面安放角的增大，高速离心泵轴功率P基本保持下降趋势，下降为最大轴功率的2.8%；效率η基本保持上升趋势，上升为最小效率的1.1%；扬程H最大变化量为设计扬程的1.5%,并出现极值点；随着轴面安放角的增大，平衡孔泄漏的高压射流对离心轮进口的主流排挤越小；当轴面安放角? 30° ≤ θ ≤ ? 10°与0° ≤ θ ≤ 20°时，随着轴面安放角的增大，转子轴向力减小，在轴面安放角θ = 0°时，轴向力发生骤增，出现极大值点；与传统轴面安放角θ = 0°的平衡孔安装方式相比，本研究中轴面安放角θ = 20°时，轴向力降低67.92%，可有效平衡转子轴向力。

Effect of Balancing Hole Meridianal Angle on Performance of High Speed Centrifugal Pump

Inorder to study the influence of the balancing hole meridional angle of the high speed centrifugal pump on its internal and external characteristics and the axial force of the rotor, taken a high speed centrifugal pump with a rotational speed of 30 000 r/min as the research object, the whole flow field was numerically calculated by using the N-S equation and the RNG k-ε turbulence model. The results show that with the increase of the meridional angle, the shaft power of the high speed centrifugal pump decreases to 2.8% of maximum shaft power, and the efficiency increases to 1.1% of the minimum efficiency, and the maximum variation of head is 1.5% of the designed head and appears the extreme point. With the increase of the meridional angle, high pressure jet leaked by balancing hole squeezes the main stream of centrifugal wheel inlet smalle. When the meridional angle is within the range of ? 30° ≤ θ ≤ ? 10° and 0° ≤ θ ≤ 20°,with the increase of the meridional angle, rotor axial force of the high speed centrifugal pump decreases. When the meridional angle is θ=0, the axial force of the rotor increases sharply and reaches the maximum point. Comparing with the traditional installation method of balanceing hole those meridional angle is θ = 0°, the axial force decreases by 67.92% and can be effectively balanced when the meridional angle is θ = 20° in this study.