Abstract：Based on Fluent software of computational fluid dynamics, the internal unsteady flow in a double pump with specific speed of 99 was numerically calculated under design condition by adopting sliding mesh technique. The pressure fluctuation principle of detecting points at different time in the impeller and volute channels was obtained. The calculation results show that the pressure fluctuation presents periodical variation in a period time at different positions of impeller channel, and increases gradually from impeller inlet to outlet at the same time. The interval time of pressure between the peak and valley are almost the same. In the volute channel, pressure fluctuation on monitoring points is more obvious when the detecting points get nearer to the tongue. The pressure fluctuation at volute outlet also presents periodical variation in a period time. The pressure fluctuation features of the two points that are centrosymmetric about basic circle center inside the volute channel seem extremely similar. The pressure fluctuation around the volute outlet was tested by virtual instrument technique and subaqua pressure sensor. By comparison, the results of numerical simulation agree well with the experiment ones, and which indicates that the unsteady simulation can satisfy the requirements of the forecast of pressure fluctuation.
刘厚林, 任 芸, 谈明高, 陆斌斌, 舒敏骅. 双流道泵内压力脉动的CFD计算及测试[J]. 排灌机械工程学报, 2010, 28(4): 277-281.
Liu Houlin, Ren Yun, Tan Minggao, Lu Binbin, Shu Minhua. CFD calculation and test of pressure fluctuationin doublechannel pump. Journal of Drainage and Irrigation Machinery Engin, 2010, 28(4): 277-281.
［1］田 辉,郭 涛,孙秀玲,等. 离心泵内部动静干涉作用的数值模拟［J］.农业机械学报,2009,40(8):92-95.Tian Hui, Guo Tao, Sun Xiuling, et al. Numerical simulation of unsteady flow in a centrifugal pump［J］. Transactions of the Chinese Society for Agricultural Machinery, 2009, 40(8): 92-95. (in Chinese) ［2］袁寿其,薛 菲,袁建平,等. 离心泵压力脉动对流动噪声影响的试验研究［J］. 排灌机械,2009,27(5):287-290.Yuan Shouqi, Xue Fei, Yuan Jianping,et al. Experimental study on impact of pressure fluctuation on flownoise in centrifugal pump［J］. Drainage and Irrigation Machinery, 2009, 27(5): 287-290. (in Chinese) ［3］赵啸冰,许洪元,王晓东,等. 水力机械蜗壳的研究进展［J］. 农业机械学报,2003,34(2):136-140.Zhao Xiaobing, Xu Hongyuan, Wang Xiaodong, et al. Research and development on volute of hydraulic machinery［J］. Transactions of the Chinese Society for Agricultural Machinery, 2003, 34(2):136-140. (in Chinese) ［4］Parrondo J, Gonzlez J, Fernndez J. The effect of the operating point on the pressure fluctuations at the blade passage frequency in the volute of a centrifugal pump［J］. Journal of Fluids Engineering, 2002, 124(3): 784-790.［5］Pavesi G, Cavazzini G, Ardizzon G. Timefrequency characterization of the unsteady phenomena in a centrifugal pump［J］. International Journal of Heat and Fluid Flow, 2008, 29(5): 1527-1540. ［6］徐朝晖,吴玉林,陈乃祥,等. 基于滑移网格与RNG k-ε湍流模型计算泵内的动静干扰［J］. 工程热物理学报,2005,26(1):66-68.Xu Zhaohui, Wu Yulin, Chen Naixiang, et al. Simulation of turbulent flow in pump based on sliding mesh and RNG k-ε model［J］.Journal of Engineering Thermophysics, 2005, 26(1): 66-68. (in Chinese)［7］Liu Houlin, Lu Mingzhen, Lu Binbin, et al. Unsteady flow numerical simulation in a doublechannel pump and measurements of pressure fluctuation at volute outlet ［C］∥Proceedings of the ASME 2009 Fluids Engineering Division Summer Meeting. USA, Colorado:［s.n.］, 2009.［8］Yakhot V, Orszag S A. Renormalization group analysis of turbulence［J］. Journal of Scientific Computing, 1986, 1(1): 3-51.［9］Admek K. Numerical modelling of air flow in jet weaving system［J］. International Journal of Polymeric Materials, 2000, 47(4): 613-623. ［10］Farrant T,Tan M, Price W G. A cell boundary element method applied to laminar vortex shedding from circular cylinders［J］.Computers and Fluids, 2001, 30(2): 211-236.［11］Woo S O, Kim J S, Kwon O J. Timeaccurate Navier-Stokes simulation of vortex convection using an unstructured dynamic mesh procedure［J］.Computers and Fluids, 2003, 32(5): 727-749.［12］赵斌娟,袁寿其,陈汇龙. 基于滑移网格研究双流道泵内非定常流动特性［J］. 农业工程学报, 2009, 25(6):115-119.Zhao Binjuan, Yuan Shouqi, Chen Huilong. Unsteady flow characteristics in doublechannel pumps based on sliding mesh［J］. Transactions of the CSAE,2009, 25(6):115-119.(in Chinese)
