|
|
|
| Pressure fluctuation and radial thrust characteristics in double volute pumps with single and double outlet |
| Jiang Yue1 , Li Hong1, Liu Yi2 |
| 1.National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2.School of Energy and Power Enginee-ring, Lanzhou University of Technology, Lanzhou, Gansu 730050, China |
|
|
|
|
Abstract In order to study the internal flow field in double volute pumps with different types of outlet, the three-dimensional, unsteady turbulent flows in a double volute pump with single and double outlet are simulated under various operational conditions by making use of the RNG k-ε turbulence model and sliding mesh technique. The pressure fluctuation and the corresponding frequency spectra at a few monitoring points are obtained as well. It is revealed that the pressure fluctuations in the double volute with single outlet are larger than those in the double volute with double outlet. The blade passing frequency dominates in the pressure fluctuations on the volute tongue and at the outlet under the design and off-design conditions for two volutes. At low flow rates, however, the impeller rotational frequency becomes dominant in the pressure fluctuations on the rib tip and at the volute outlet for the pump with single outlet. Two kinds of double volute can eliminate the radial thrust under different flow rates effectively, but the impeller in the double volute with single outlet is subject to a larger radial thrust because of a significant pressure fluctuation in that volute.
|
|
Received: 22 September 2013
|
|
|
|
| [1]谈明高,刘厚林,袁寿其.离心泵能量性能预测对比[J].农业工程学报,2008,24(11):95-98. Tan Minggao,Liu Houlin,Yuan Shouqi. Comparative research on energy performance prediction of centrifugal pumps[J]. Transactions of the CSAE,2008,24(11):95-98.(in Chinese)[2]Hodkiewicz M R,Norton M P. The effect of change in flow rate on the vibration of double suction centrifugal pumps[J].Journal of Process Engineering,2001,216(1):47-58.[3]Chu S,Dong R,Katz J. Relationship between unsteady flow,pressure fluctuations,and noise in a centrifugal pump,Part A:Use of PDV data to compute the pressure field[J]. Journal of Fluids Engineering, 1995,117(1):24-35.[4]刘阳,袁寿其,袁建平.离心泵的压力脉动研究进展[J].流体机械,2008,36(9):33-37. Liu Yang,Yuan Shouqi,Yuan Jianping. Over of pressure fluctuation in centrifugal pump[J].Fluid Machinery,2008,36(9):33-37.(in Chinese)[5]严敬,谢功耋,张江源,等.国外一种离心泵双蜗壳设计方法的介绍和分析[J].排灌机械, 2008,26(6):46-49. Yan Jing,Xie Gongdie,Zhang Jiangyuan,et al. Analysis and brief introduction for a foreign-designed centrifugal pump of double-volute[J]. Drainage and Irrigation Machinery,2008,26(6):46-49.(in Chinese)[6]González J,Blanco E,Santolaria C,et al. Unsteady flow structure on a centrifugal pump:Experimental and numerical approaches[C]// Proceedings of the ASME Fluids Engineering Division Summer Meeting.Montreal,Canada:[s.n.], 2002:761-768.[7]González J, Parrondo J L, Santolaria C, et al. Steady and unsteady radial forces for a centrifugal pump with impeller to tongue gap variation [J]. Journal of Fluids Engineering, 2006, 128(3): 454-462. [8]González J, Fernndez J, Blanco E, et al. Numerical simulation of the dynamic effects due to impeller-volute interaction in a centrifugal pump [J]. Journal of Fluids Engineering, 2002, 124(2):348-355.[9]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)[10]肖若富,吕腾飞,王福军.双蜗壳式双吸泵隔板结构对叶轮径向力的影响[J].农业机械学报,2011,42(9):85-88. Xiao Ruofu,Lü Tengfei,Wang Fujun. Influence of rib structure in double-volute centrifugal pumps on the impeller radial force [J].Transactions of the Chinese Socie-ty for Agricultural Machinery,2011,42(9):85-88.(in Chinese)[11]关醒凡.现代泵理论与设计[M].北京:中国宇航出版社,2011.[12]Farrant T,Tan M,Price W G.Cell boundary element method applied to laminar vortex shedding from circular cylinders[J].Computers and Fluids,2001,30(2):211-236.[13]Issa R I. Solution of implicitly discredited fluid flow equations by operator splitting[J]. Journal of Computational Physics,1986, 62(1):40-65.[14]王福军.计算流体动力学分析—CFD软件原理与应用[M].北京:清华大学出版社, 2004.[15]Nere N K, Patwardhan A W, Joshi J B. Prediction of flow pattern in stirred tanks: New constitutive equation for eddy viscosity[J]. Industrial and Engineering Chemi-stry Research, 2001, 40(7): 1755-1772. |
|
|
|
