Abstract:Using SST k-ω turbulent model, both steady and unsteady numerical methods were applied to simulate centrifugal pumps with various collectors of single volute, double volute, and vaned diffuser with a volute, in which the same impeller was adopted. The overall characteristics, steady and unsteady radial forces characteristics of the centrifugal pumps with three different collectors were compared and analyzed according to the simulated results. The results show that the curves of capacityhead of both single volute and double volute centrifugal pump are flat and the high efficiency areas are relatively wide. Radial force of the single volute centrifugal pump is much larger than that of the other two. As flow rate increases, radial force direction of the vaned centrifugal pump changes slightly, while those of the other two change greatly and move from the tongue to the volute exit. The overall trend of radial forces of single volute and double volute centrifugal pumps is elliptic distribution, and that of the vaned centrifugal pump is irregular. Radial force balance of the single volute centrifugal pump is poor and transient amplitude fluctuations are much larger than the other two models. The research results can be beneficial reference for cognition and design of centrifugal pumps.
江伟, 李国君, 张新盛. 压水室结构对离心泵径向力影响的数值分析[J]. 排灌机械工程学报, 2013, 31(2): 93-97.
JIANG Wei, LI Guo-Jun, ZHANG Xin-Sheng. Numerical analysis the influence of collector configurations on radial force for centrifugal pumps. Journal of Drainage and Irrigation Machinery Engin, 2013, 31(2): 93-97.
[1]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(5): 859-870.[2]Solis M, Bakir F, Khelladi S.Pressure fluctuations reduction in centrifugal pumps:Influence of impeller geometry and radial gap[C]//Proceedings of the ASME 2009 Fluids Engineering Division Summer Meeting, USA:[s.n.], 2009: 253-265.[3] Gonzlez J, Santolaria C, Parrondo J L, et al. Unsteady radial forceson the impeller of a centrifugal pumpwith radial gap variation[C]//Proceedings of 4th ASME/JSME Joint Fluids Engineering Conference, USA:[s.n.], 2003: 1173-1181.[4] 杨敏,闵思明,王福军.双蜗壳泵压力脉动特性及叶轮径向力数值模拟[J].农业机械学报,2009,40(11):83-88.Yang Min,Min Siming,Wang Fujun.Numerical simulation of pressure fluctuation and radial force in a double volute pump[J].Transactions of the Chinese Society for Agricultural Machinery, 2009,40(11):83-88. (in Chinese)[5]José González,Jorge Parrondo,Carlos Santolaria,et al. Steady and unsteady radial forces for a centrifugal pump with impeller to tongue gap variation[J]. Transactions of the ASME, 2006,27:454-462.[6]Van Esch B P M.Performance and radial loading of a mixedflow pump under nonuniform suction flow [J]. Journal of Engineering for Power, 2009,131:1-7.[7]关醒凡.现代泵理论与设计[M].北京:中国宇航出版社,2011:303-360.[8]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.[9]杨敏官,孙鑫恺,高波.离心泵内部非定常空化流动特征的数值分析[J].江苏大学学报:自然科学版,2012,33(4):408-413.Yang Minguan,Sun Xinkai, Gao Bo.Numerical analysis of unsteady cavitating flow characteristic in centrifugal pump[J].Journal of Jiangsu University:Natural Science Edition, 2012, 33(4):408-413.(in Chinese)[10]祝磊,袁寿其,袁建平.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. Numerical simulation on pressure fluctuations and radial hydraulic forces in centrifugal pump with step tongue[J]. Transactions of the Chinese Society for Agricultural Machinery, 2010,41(S1):21-26. (in Chinese)