偏置短叶片离心泵内三维流场数值模拟

Numerical simulation of three-dimensional flow field in centrifugal pump with deviated short splitter vanes

改善离心泵的水力性能,提高效率是离心泵优化设计的重要研究内容。采用Fluent软件,基于Reynolds时均N-S方程和RNGκ-ε湍流模型,对IS65-40-250型偏置短叶片离心泵进行三维流场数值模拟,分析了流体在离心泵内的速度和压力分布,揭示其内部的流动规律。研究表明:采用短叶片偏置设计方法,有利于提高离心泵内流场速度和压力分布的均匀性,减小了叶轮出口处的压力脉动,降低了冲击损失;对改进后的离心泵扬程和水力效率进行计算,发现其扬程和水力效率较原型离心泵分别提高了3.46%和1.7%,达到增效节能的目的。

Improving hydraulic properties to elevate the efficiency is an important research content in optimization design of centrifugal pumps.Based on the Reynolds time averaged N-S equations（RANS） and RNG κ-ε turbulence models,the three-dimensional flow field of the IS65-40-250 centrifugal pump with deviated short splitter vanes was simulated in Fluent software.The velocity and pressure of the flow in the centrifugal pump were analyzed and the internal flow rule was revealed.The result showed that by design of short splitter vane,the velocity and uniformity of pressure distribution in the centrifugal pump were improved,and the pressure pulse of impeller exit decreased,and the loss of impact was reduced.According to calculation of head and waterpower efficiency of the improved pump,the head and waterpower efficiency increased by 3.46% and 1.7% respectively,and the purpose of energy saving was achieved.