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Numerical simulation and performance prediction of unsteady flow in multistage submersible centrifugal pump |
Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang, Jiangsu 212013, China |
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Abstract To investigate the internal characteristics of flow field in multistage submersible centrifugal pump, the first stage of the pump with impeller and diffuser was selected. The three dimensional unsteady flow field of impeller and diffuser was simulated with RNG k-ε turbulence model and sliding mesh technology. The relative velocity flow angle, the absolute velocity flow angle and the ratio of relative velocity and circumferential velocity at different radius in the first channel were obtained to analyze the velocity triangles of impeller pressure surface. The performance curves of numerical simulation were compared with the experiment results. The results show that the absolute velocity and the absolute velocity component are decreased with the increasing of flow rate. At the positions of 0.90R2 and 0.95R2, the changes of relative flow angle at 100% flow rate and at small flow rate are obvious. Unsteady calculation can accurately predict the performance of multistage submersible centrifugal pump.
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Received: 27 July 2012
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