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Effect of elbow on guide vane region flow for a bidirectional axial flow pump |
Ma Pengfei1, Wang Jun1, Liu Weiwei2, Cai Kuiyi2 |
1.School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China; 2.Shanghai East Pump(Group)Co. Ltd., Shanghai 201906, China |
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Abstract The elbow on an axial flow pump can cause interference to the upstream fluid of it. In order to investigate the best relative position between elbow and guide vane,a high specific speed bidirectional axial-pump was chosen as the study object to analyze the cause of numerical simulation results change, which occurred when guide vane grid rotated. It was found that the relative positions both between vane and blade and between vane and elbow can affect the steady numerical simulation results. Then the flow field of passage without guide vane and blade was simulated by the LES(Large Eddy Simulation)method, the cause of pump performance change was analyzed, and the result was verified by comparing the flow field of guide vane area at different positions. The results show that the pump performances at different positions of guide vane have a certain difference, and the inlet incidence angle of guide vane may deviate from the design angle.It can be used to reduce the influence of elbow on pump performance by extending diffusion tube, reducing elbow angle and adjusting guide vane arrangement in design.
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Received: 25 December 2014
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