空间导叶式离心泵的数值计算及优化设计

基于Navier-Stokes方程和标准k-ε湍流模型,采用SIMPLEC算法对一空间导叶式离心泵进行全流道三维湍流数值计算,分析了导叶式离心泵在设计工况下整个流道、环形空间及其空间导叶内部的流场分布,并进行试验验证计算结果.结果表明,叶轮叶片吸力面靠近进口区域压力最小,出现负值,该区域将有可能发生空化;液体流经叶轮和空间导叶之间的环形空间时将产生较大的冲击损失;液体由叶轮出口高速旋转流出经过环形空间流入空间导叶,空间导叶进口附近流速较大,在空间导叶吸力面的入口处存在二次流.试验结果和计算结果吻合较好,在相同流量下数值计算结果和试验数据的最大误差基本小于15%,在可以接受的范围之内,证明了数值计算的有效性.该研究结果为空间导叶的几何参数优化提供了一定的理论参考.

Numerical calculation and optimal design of centrifugal pump with space guide vanes

Based on Navier-Stokes equations and standard k-ε turbulence model,the three-dimensional turbulent flow in a centrifugal pump with space guide vanes was numerically simulated by using a SIMPLEC algorithm.The internal flow field of a centrifugal pump with entire flow,annular space and space guide vanes under design condition was analyzed,and the experiment was carried out to examine the simulation results.The results showed that the pressure of suction surface of impeller blades near the inlet area was lowest and negative pressure appeared.Higher impact loss was found in the annular space between impeller and space guide vanes.The high-speed rotating fluid from impeller outlet flowed into the guide vanes through annular space,the velocity near the inlet of space guide vanes was high,and there existed secondary flow near the leading edge of the space guide vane suction surface.The calculation and experimental results coincided well,and the maximum error was less than 15% between the numerical calculation results and experimental data under the same flow,which was in the acceptable limits and proved the effectiveness of numerical calculation.The research results provide a theoretical reference for geometric parameters optimization of the space guide vanes.