为提高已有两级离心泵中径向导叶的水力性能,按照正交试验要求,选取径向导叶的喉部面积、扩散角、反导叶数、反导叶高度4个因素,每个因素取3个水平,设计9个导叶.基于ANSYS CFX软件,选取k-ε湍流模型,并结合全隐式耦合算法对装配具有不同几何参数径向导叶的两级泵全流场进行数值计算,获得了9组设计方案在额定工况下的扬程、效率.以泵的扬程和效率作为试验指标,利用极差分析法分析了所选几何参数对于两级泵扬程、效率的影响规律,以及影响径向导叶性能的主要因素和次要因素,提出了性能较优的径向导叶方案.径向导叶喉部面积对两级泵的扬程、效率影响较大.经数值计算可得,较优方案的额定工况下的扬程为211.70 m,效率为47.63%,较之优化前的径向导叶,扬程提高了1.24 m,效率提高了4.00%,取得了较好的优化效果.
In order to improve the hydraulic performance of radial guide vanes in two-stage centrifugal pumps, four factors of guide vane including the area of throat, diffuser angle, back vanes numbers and height of back vanes were selected to meet the L9 （34） orthogonal experiment requirements, so nine different guide vanes were designed. Based on ANSYS CFX, the whole flow field of two-stage pump was simulated by using the standard k -ε turbulence model and the fully implicit coupled algorithm. The heads and efficiencies of nine design schemes were obtained. The head and efficiency was selected as the criterion of the test, the effects of geometrical parameters on heads and efficiencies were studied by using orthogonal test method, and the primary and secondary factors of the design parameters were all analyzed by ways of variance analysis. The area of guide vanes throat has great effect on two-stage pump performance. According to the test results, an optimum scheme was put forward. The simulation results of the optimum scheme show that the head of the pump at rated flow point is of 211.70 m and the efficiency is of 47.63%. Compared to the significantly improved by 1.24 m and 4.00% original radial guide vane, the head and efficiency are respectively.
Drainage and Irrigation Machinery
two-stage centrifugal pump
radial guide vanes