|
|
|
| Influence of two types of cut-water shapes on simulated performance of centrifugal pump |
| Yuan Shouqi, Heng Yaguang, Hong Feng, Yuan Jianping, Si Qiaorui, Hu Bo |
| Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang, Jiangsu 212013, China |
|
|
|
|
Abstract A comparative study was conducted between two types of cut-water shapes which significantly affect the performance of a centrifugal pump to improve the accuracy of performance prediction and reduce development costs for the pump. The computational fluid domains include suction pipe, impeller and volute, which were meshed with Ansys ICEM CFD code to generate a structured mesh and the numerical simulation of flow in the pump was accomplished with Ansys CFX. There is the normal velocity boundary condition at the inlet to the suction pipe, and there exists the outlet pressure condition at the discharge of the volute diffuser. The mechanical and volumetric efficiencies were considered to be 89% and 96%, respectively. It was found that the simulated performance for the pump with round cut-water shape is close to the test data at various flow rates. The simulated performance for the pump with rectangular cut-water shape is near the measured result at low flow rates, but shows a relatively noticed difference from the measured one at a high flow rate. According to the pressure contours and streamline plots, the high pressure zone on the round cut-water is relatively stable and the streamlines around it are smooth with increasing flow rate. For the rectangular cut-water shape, however, the high pressure zone is unstable to shed a series of vortices at the design condition and high flow rate. Those vortices alter flow patterns in the volute and eventually result in that the predicted performance differs from the measurement considerably. The reason, why there is a significant difference in the perfor-mance exists between two types of cut-water shapes, has been clarified by analyzing the flow field in the volute. It is confirmed that a round cut-water can make flow pattern in the volute smoother and subsequently improves the pump performance.
|
|
Received: 20 December 2012
|
|
|
|
| [1]张淑佳,李贤华,朱保林,等.k-ε涡粘湍流模型用于离心泵数值模拟的适用性[J].机械工程学报,2009,45(4):238-242. Zhang Shujia,Li Xianhua,Zhu Baolin,et al.Applicability of k-ε eddy viscosity turbulence models on numerical simulation of centrifugal pump[J].Journal of Mechanical Engineering,2009,45(4):238-242.(in Chinese)[2]祝磊,袁寿其,袁建平,等.不同径向间隙对离心泵动静干涉作用影响的数值模拟[J].农业机械学报,2011,42(5):49-55. Zhu Lei,Yuan Shouqi,Yuan Jianping,et al.Numerical simulation on rotor-stator interaction in a centrifugal pump with different gaps between impeller and tongue[J].Transactions of the Chinese Society for Agricultural Machinery,2011,42(5):49-55.(in Chinese)[3]Spence R,Amaral-Teixeira J.A CFD parametric study of geometrical variations on the pressure pulsations and performance characteristics of a centrifugal pump[J].Computers & Fluids,2009,38:1243-1257.[4]瞿丽霞,王福军,丛国辉,等.隔舌间隙对双吸离心泵内部非定常流场的影响[J].农业机械学报,2011,42(7):50-55. Qu Lixia,Wang Fujun,Cong Guohui,et al.Effect of volute tongue-impeller gaps on the unsteady flow in double-suction centrifugal pump[J].Transactions of the Chinese Society for Agricultural Machinery,2011,42(7):50-55.(in Chinese)[5]刘全忠,官汝志,王洪杰,等.离心泵隔舌间隙对叶轮流体作用力的影响[J].水泵技术,2009(4):26-29. Liu Quanzhong,Guan Ruzhi,Wang Hongjie,et al.Impact of tongue gap on fluid force in pump impeller[J].Pump Technology,2009(4):26-29.(in Chinese)[6]Rudolf Bachert,Bernd Stoffel,Matevž Dular.Unsteady cavitation at the tongue of the volute of a centrifugal pump[J].Journal of Fluids Engineering,2010,132(6):061301.[7]Barrio R,Parrondo J,Blanco E.Numerical analysis of the unsteady flow in the near-tongue region in a volute-type centrifugal pump for different operating points[J].Computers & Fluids,2010,39:859-870.[8]祝磊,袁寿其,袁建平,等.阶梯隔舌对离心泵压力脉动和径向力影响的数值模拟[J].农业机械学报,2010,41(S1):21-26. Zhu Lei,Yuan Shouqi,Yuan Jianping,et al.Numerical simulation on pressure fluctuations and radial hydraulic forces in centrifugal pump with step-tongue[J]. Transa-ctions of the Chinese Society for Agricultural Machinery,2010,41(S1):21-26.(in Chinese)[9]祝磊,袁寿其,袁建平,等.不同型式隔舌离心泵动静干涉作用的数值模拟[J].农业工程学报,2011,27(10):50-55. Zhu Lei,Yuan Shouqi,Yuan Jianping,et al.Numerical simulation for rotor-stator interaction of centrifugal pump with different tongues[J].Transactions of the CSAE,2011,27(10):50-55.(in Chinese)[10]周水清,孔繁余,王志强,等.基于结构化网格的低比转数离心泵性能数值模拟[J].农业机械学报,2011,42(7):66-69. Zhou Shuiqing,Kong Fanyu,Wang Zhiqiang,et al. Numerical simulation for low specific-speed centrifugal pump with structured grid[J]. Transactions of the Chinese Society for Agricultural Machinery,2011,42(7):66-69.(in Chinese)[11]纪兵兵,陈金瓶.ANSYS ICEM CFD 网格划分技术实例详解[M].北京:中国水利水电出版社,2012.[12]谢龙汉,赵新宇,张炯明.ANSYS CFX流体分析及仿真[M].北京:电子工业出版社,2012.[13]关醒凡.现代泵理论与设计[M].北京:中国宇航出版社,2011. |
|
|
|
