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
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.
[1]吴玉林,葛亮,陈乃祥. 离心泵叶轮内部固液两相流动的大涡模拟[J]. 清华大学学报:自然科学版,2001,41(10):93-96. Wu Yulin, Ge Liang, Chen Naixiang. Large eddy simulation of silt-liquid two-phase flow through a centrifugal pump impeller[J]. Journal of Tsinghua University:Science and Technology, 2001, 41(10):93-96.(in Chinese)[2]Iwai Y, Nambu K. Slurry wear properties of pump lining materials[J]. Wear,1997, 210(1/2):211-219.[3]钱忠东,王焱,郜元勇. 双吸式离心泵叶轮泥沙磨损数值模拟[J].水力发电学报,2012,31(3):223-229. Qian Zhongdong, Wang Yan, Gao Yuanyong. Numerical simulation of sediment erosion in double-suctions centrifugal pump[J]. Journal of Hydroelectric Enginee-ring, 2012,31(3):223-229.(in Chinese)[4]许洪元,吴玉林,高志强,等. 稀相固粒在离心泵轮中的运动实验研究和数值分析[J]. 水利学报,1997(9):12-18. Xu Hongyuan, Wu Yulin, Gao Zhiqiang, et al. Experimental study and numerical analysis of the motion of dilute soild particles in centrifugal pump impellers[J]. Journal of Hydraulic Engineering, 1997(9):12-18.(in Chinese)[5]郜元勇,钱忠东,董斌. 楔形槽对离心泵口环磨损的影响分析[J]. 中国农村水利水电,2012(5):121-124. Gao Yuanyong, Qian Zhongdong, Dong Bin. Influence of wedge-groove on sediment erosion of impeller ring in a centrifugal pumps[J]. China Rural Water and Hydropower, 2012(5):121-124.(in Chinese)[6]Launder B E, Spalding D B. The numerical computation of turbulent flows[J]. Computer Methods in Applied Mechanics and Engineering, 1974, 3(2):269-289.[7]Wang Ze, Liu Weiming. Two modificatory k-ε turbulence models for turbulent swirling flows[J]. Journal of Hydrodynamics, 2003, 15(2):51-57.[8]Yakhot V,Orszag S A. Renormalization group analysis of turbulence.Ⅰ:Basic theory[J]. Journal of Scientific Computing, 1986, 1(1):3-11.[9]Patanker S V. Numerical Heat Transfer and Fluid Flow[M].Washington:Hemiphere,1980:131-134.[10]Patanke S V, Spalding D B. A calculation procedure for heat, mass and momentum transfer in three-dimensional parabolic flows[J]. International Journal of Heat and Mass Transfer, 1972,15(10):1787-1806.[11]钱忠东,郜元勇,谢华,等. 基于CFD技术的双吸式离心泵的转轮副叶片优化[J].排灌机械工程学报, 2012, 30(5):503-507. Qian Zhongdong, Gao Yuanyong, Xie Hua, et al. Optimization of impeller back vanes in double-suction centrifugal pump by CFD technique[J]. Journal of Drai-nage and Irrigation Machinery Engineering,2012,30(5):503-507.(in Chinese)
