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 original radial guide vane, the head and efficiency are significantly improved by 1.24 m and 4.00% respectively.
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