|
|
|
| Optimization of impeller back vanes in doublesuction centrifugal pump by CFD technique |
| QIAN Zhong-Dong, GAO Yuan-Yong, XIE Hua, WANG Zhi-Yuan |
(State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan, Hubei 430072, China) |
|
|
|
|
Abstract The water flow and sand particles motion in a prototype of doublesuction centrifugal pump were simulated using the RNG k-ε turbulence model and the Euler-Lagrange multiphase flow model. The influence of length and relative position of the back vanes on sand mass concentration around the wearrings and pump efficiency were analyzed. According to the predicted results, the flow models adopted in this paper can predict the water flow pattern and the sand concentration near the wearrings precisely. The velocity of water flow near the wearrings is so low that the flow carries less sand particles away from the entrance to wearrings, causing there exits a much high sand concentration near the rings compared with the bulk sand concentration in the flow. Eventually the two surfaces of the wearrings gap are damaged quite quickly.With decreasing length of back vanes the pump efficiency is degraded and there exits a minimum length for back vanes to prevent sediment erosion in the wearrings. When the number of backvanes is reduced to three from four, the ability for flow to carrying sand particles is retained and its protecting effect on the wearrings the impeller rings is significant. Further, the pump efficiency is kept in a reasonable level. The case 7 is the optimal design of the blade vanes.
|
|
Received: 10 April 2012
Published: 30 September 2012
|
|
|
|
| 1］施卫东,孙相春,陈培伦,等.双“S”形叶轮浆料泵的设计与试验［J］.排灌机械,2008,26(4):22-25.Shi Weidong, Sun Xiangchun, Chen Peilun, et al. Design and experiment of slurry pumpwith dual "S" impeller［J］. Drainage and Irrigation Machinery,2008,26(4):22-25.(in Chinese)［2］徐建林.离心泵的轴向力计算公式及叶轮背叶片的设计方法［J］.甘肃工业大学学报, 1989(6):59-62.Xu Jianlin. A formula for determination of axial force and a design method of bake blade in centrifugal pump［J］. Journal of Gansu University of Technology, 1989(6):59-62.(in Chinese)［3］Wang Fujun, Li Yaojun, Wang Yanli. CFD simulation of 3D flow in largebore axialflow pump with halfelbow suction sump［J］. Journal of Hydrodynamics, 2006,18(2):243-247.［4］Blanco M. Numerical flow simulation in a centrifugal pump with impelvolute interaction［C］／／Proceedings of the ASME 2000 Fluid Engineering Division Summer Meeting. Boston, Massachusetts:［s.n.］, 2000:11-15.［5］Shukla S N, Kshirsagar J T. Numerial experiments on a centrifugal pump［C］／／Proceedings of the American Society of Mechanical Engineers, Fluids Engineering Division, 2002: 709-720.［6］Chen Hongxun. Research on turbulent flow within the vortex pump［J］. Journal of Hydrodynamics, 2004, 16(6):701-707.［7］刘伟超,张克危,王江祥.泵副叶片动密封的CFD分析［J］. 通用机械,2003(6):59-62.Liu Weichao, Zhang Kewei, Wang Jiangxiang. CFD analysis of back blade in pump for dynamic sealing［J］. General Machinery,2003(6):59-62. (in Chinese)［8］Wang Ze, Liu Weiming. Two modificatory k-ε turbulence models for turbulent swirling flows［J］.Journal of Hydrodynamics, 2003,15(2):51-57. |
|
|
|
