Abstract:To reduce the pressure fluctuation amplitude in a double-suction centrifugal pump, the blades of both sides of the impeller are separated circumferentially with 0?, 10?, 20?, 30? staggered angles respectively in double-suction pump ES350-585 with a usual double-suction impeller. A structured grid in the flow domains of five pumps with usual and staggered impellers is generated by using Gridpro; subsequently aunsteady, 3D fluid dynamics analysis is launched in ANSYS CFX to obtain pump performance and unsteady static pressure profiles. It is seen that the staggered blades can reduce pressure fluctuation in the pumps effectively. Moreover the pressure fluctuation amplitude decreases with the increasing staggered angle. Importantly, when the staggered is 30?, the pressure fluctuation amplitude in the volute reaches the minimum and the static pressure becomes the most uniform at the entrance to the volute.
[1]Gonzalez J,Santolaria C,Blance E. The influence of volute tongue on the pressure oscillations inside a centrifugal pump[C]//Proceedings of the 1st IAHR Symposium Hydraulic Machinery and System,2002.[2]黎义斌, 李仁年,王秀勇,等. 低比转混流泵压力脉动特性的数值模拟[J]. 排灌机械工程学报, 2013,31(3): 205-209. Li Yibin,Li Rennian,Wang Xiuyong,et al. Numerical analysis of pressure fluctuation in low specific speed mixed-flow pump [J]. Journal of Drainage and Irrigation Machinery Engineering,2013,31(3): 205-209.(in Chinese)[3]李辰光,王福军,许建中,等, 两级双吸离心泵压力脉动特性[J]. 农业机械学报, 2011,42(7): 41-49. Li Chenguang,Wang Fujun, Xu Jianzhong,et al. Pressure fluctuation of a two-stage double-suction centrifugal pump[J].Transactions of the Chinese Society for Agricultural Machinery,2011,42(7): 41-49.(in Chinese)[4]Chu S,Dong R,Katz J. Relationship between unsteady flow,pressure fluctuations,and noise in a centrifugal pump-Part B: Effects of blade tongue interactions[J]. Journal of Fluids Engineering,Transactions of the ASME,1995,117(1): 30-35.[5]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(6): 1243-1257.[6]Miyabe M,Maeda H,Umeki I,et al.Unstable head-flow characteristic generation mechanism of alow specific speed mixed flow pump[J].Journal of Thermal Science,2006,15(2): 115-20,144.[7]Moises S,Bakir S,Khelladi F,et al.Pressure fluctuations reduction in centrifugal pumps: Influence of impeller geometry and radial gap[C]//Proceedings of the ASME Fluids Engineering Division Summer Conference,2009.[8]姚志峰,王福军,杨敏,等.叶轮形式对双吸离心泵压力脉动特性影响试验研究[J].机械工程学报,2011,47(12):137-141. Yao Zhifeng,Wang Fujun,Yang Min,et al. Effects of impeller type on pressure fluctuations in double-suction centrifugal pump[J]. Journal of Mechanical Engineering, 2011,47(12):137-141.(in Chinese)[9]黄思, 管俊. 基于空化模型的多级离心泵汽蚀性能分析[J].流体机械,2011,39(1):29-31,28. Huang Si, Guan Jun.Analysis on cavitation performance in multi-stage centrifugal pump based on cavitation model[J]. Fluid Machinery, 2011,39(1):29-31,28.(in Chinese)[10]靳栓宝,王永生,常书平,等. 混流泵内流场压力脉动特性研究[J].农业机械学报,2013,44(3):64-68. Jin Shuanbao,Wang Yongsheng,Chang Shuping,et al. Pressure fluctuation of interior flow in mixed-flow pump[J]. Transactions of the Chinese Society for Agricultural Machinery,2013,44(3):64-68.(in Chinese)[11]耿少娟,聂超群,黄伟光,等.不同叶轮形式下离心泵整机非定常流场的数值研究[J].机械工程学报,2006,42(5):27-31. Geng Shaojuan,Nie Chaoqun,Huang Weiguang,et al.Numerical study of unsteady flow in centrifugal pump with different type of impellers[J].Journal of Mechanical Engineering,2006,42(5):27-31.(in Chinese)[12]Lobanoff V S,Ross R R.Centrifugal Pump:Design and Application[M].2nd Edition.Houston:Gulf Publication Company,1996.[13]Pavesi G,Cavazzini G,Ardizzon G.Time-frequency characterization of the unsteady phenomena in a centrifugal pump[J].International Journal of Heat and Fluid Flow,2008,29(5): 1527-1540.[14]Jens F, Günter K. Rotating cavitation in a centrifugal pump impeller of low specific speed[J]. Journal of Fluids Engineering, 2002, 124(2):356-361.[15]关醒凡.现代泵技术手册[M].北京:中国宇航出版社,2011.[16]司乔瑞,袁寿其,袁建平,等. 叶片与隔舌干涉对离心泵性能和压力脉动影响的数值研究[J].流体机械,2012,40(8):22-26. Si Qiaorui,Yuan Shouqi,Yuan Jianping,et al. Effect of interaction between blade and volute tongue of centrifugal pumps on the performance and pressure pulsation[J]. Fluid Machinery, 2012, 40(8): 22-26.(in Chinese)