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| Effect of blade leading edge shape on sediment erosion of blade in double-suction centrifugal pumps |
| Qian Zhongdong1, Zhang Kai1, Wang Zhiyuan1, Xue Jun2 |
| 1.State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan, Hubei 430072, China; 2.Management Office of Linyi Huilong Pump Water Engineering, Yuncheng, Shanxi 044103, China |
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Abstract In order to improve the anti-abrasion characteristics of pumps, the water flow and movement of silt in a double-suction centrifugal pump was simulated using an Euler-Lagrange multiphase flow model. The erosion rate of blade was predicted with a particle erosion model and the influence of the four different blade leading edge shapes on the erosion rate was analyzed. The results show that the blade leading edge and the blade trailing edge are usually severely destroyed by sediment erosion, and the average erosion rate on the suction side is always greater than that on the pressure side. The relative velocity and the incidence angle are the two major factors that influence on the erosion rate of blade, and are able to be controlled by changing the blade leading edge shape. The relative velocity near the blade leading edge appears uniform after cutting the tip area of the blade leading edge, and the erosion rates at both the blade leading edge and the blade trailing edge are decreased while the pump head is also decreased. Sediment erosion of the blade is effectively controlled and the pump head is slightly increased while cutting the tip side of the blade trailing edge as well as increasing the incidence angle near the hub.
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Received: 20 December 2012
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