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| Numerical simulation on flow performance and blade profile optimal design of mixedflow pump impeller |
| Xie Rong, Shan Yujiao, Wang Xiaofang |
| (Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology, Dalian, Liaoning 116024, China) |
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Abstract A numerical calculation was carried out to simulate threedimensional turbulent flow in a high specificspeed mixedflow pump impeller under design condition. Through the analysis of impeller internal flow, some problems caused by the unsuitable local structure were found, such as vast vortexes aeras and wall flow separations, which added flow losses. Aimed at the problems, a multiparameter optimal method was adopted to redesign blade profile, and the action rules of blade profile on impeller internal flow were analyzed. The results show that the horse hoof shaped vortexes at impeller inlet and passage vortexes and wall flow separations can be removed and the passage vortex intensity and influencing range are reduced by adjusting blade curvature. The hydraulic efficiency of the optimized impeller increases 4.74% relatively, and the head per power dissipation increases 11.5%. The calculated data of impeller performance parameters are in good agreement with the experimental ones, which proves accuracy and reliability of the adopted method and model.
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Received: 16 March 2010
Published: 30 July 2010
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