高压端出流条件对多级泵径向力的影响
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摘要
为了降低节段式多级泵叶轮所受的径向力,提高多级泵运行时的稳定性,采用剪切应力传输κ-ω湍流模型对高压双壳体多级泵末级导叶出口有出口压盖和无出口压盖2种情况分别进行了全流道非稳态数值计算,比较了2种情况在设计与非设计工况下末级叶轮及整个叶轮所受的径向力。研究结果表明,1个旋转周期内,末级叶轮径向力波动周期与末级导叶叶片数(即反导叶数)相同,整个叶轮的波动周期与正导叶叶片数相同。此外,添加出口压盖后,末级叶轮及末级导叶流道内流线分布更均匀,旋涡区明显减少,径向力幅值及主频也明显减小。
To reduce the radial force of segmental multistage pump and improve the stability of multistage pump operation,the shear stress transportκ-ω turbulence model is applied to the numerical unsteady simulation of whole flow channel for the last stage guide vane outlet with and without export gland.A comparison of the radial forces between the last stage impeller and the whole impeller under the two conditions is performed.Results show that in a whole rotation cycle the fluctuation periods coincide with the blade number of the return guide vanes for last stage impeller,and the fluctuation periods coincide with the blade number of the positive guide vane for the all impeller.When adding the export gland,the streamline distribution in the outlet of last impeller and last guide vane gets more uniform,the vortex zone gets smaller,and the radial force on the last impeller and the all impellers are reduced.
To reduce the radial force of segmental multistage pump and improve the stability of multistage pump operation,the shear stress transportκ-ω turbulence model is applied to the numerical unsteady simulation of whole flow channel for the last stage guide vane outlet with and without export gland.A comparison of the radial forces between the last stage impeller and the whole impeller under the two conditions is performed.Results show that in a whole rotation cycle the fluctuation periods coincide with the blade number of the return guide vanes for last stage impeller,and the fluctuation periods coincide with the blade number of the positive guide vane for the all impeller.When adding the export gland,the streamline distribution in the outlet of last impeller and last guide vane gets more uniform,the vortex zone gets smaller,and the radial force on the last impeller and the all impellers are reduced.
引文
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[14]关醒凡.现代泵理论与设计[M].北京:中国宇航出版社,2011:527-530.
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[16]史凤霞.离心泵作液力透平的水力学特性及其压力脉动研究[D].兰州:兰州理工大学,2017:29-40.
[2]ADKINS D R,BRENNEN C E.Analyses of hydrodynamic radial forces on centrifugal pump impellers[J].Journal of Fluids Engineering,1988,110(1):20-28.
[3]CHAMIEH D S,ACOSTA A J,BRENNEN C E,et al.Experimental measurements of hydrodynamic stiffness matrices for a centrifugal pump impeller[R].Pasadena,CA,USA:National Aeronautics and Space Administration,1982:382-398.
[4]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 and Fluids,2010,39(5):859-870.
[5]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 steptongue[J].Transactions of the Chinese Society of Agricultural Machinery,2010,41(s1):21-26.
[6]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 Guojun,ZHANG Xinsheng.Numerical analysis the influence of collector configurations on radial force for centrifugal pumps[J].Journal of Drainage and Irrigation Machinery Engineering,2013,31(2):93-97.
[7]TAN M,GUO B,LIU H,et al.Investigation of radial force and hydraulic performance in a centrifugal pump with different guide vane outlet angel[J].Journal of Vibroengineering,2015,17(6):3247-3259.
[8]陆国成,左志钢,刘树红,等.压水室形状对某离心泵径向力影响的数值模拟[J].工程热物理学报,2015,36(4):770-774.LU Guocheng,ZUO Zhigang,LIU Shuhong,et al.Numerical analysis of the influence of casing’s shape on radial force of a centrifugal pump[J].Journal of Engineering Thermophysics,2015,36(4):770-774.
[9]HERGT P.Radial forces in centrifugal pumps with guide vanes[J].Proceedings of the Institution of Mechanical Engineers,1970,184(314):101-107.
[10]BRENNEN C E.Hydrodynamics of pumps[M].Cambridge,UK:Cambridge University Press,2011:230-233.
[11]PLUTECKI J,SKRZYPACZ J.CFD simulation of 3Dflow in a pump stator with a spherical surface[J].World Pumps,2003(443):28-31.
[12]GLICH J F.Centrifugal pumps[M].Berlin,Germany:Springer,2008:544-545.
[13]GUO S,OKAMOTO H.An experimental study on the fluid forces induced by rotor-stator interaction in a centrifugal pump[J].International Journal of Rotating Machinery,2003,9(2):135-144.
[14]关醒凡.现代泵理论与设计[M].北京:中国宇航出版社,2011:527-530.
[15]YOO I S,PARK M R,YOON E S.Modification of balancing piston for trimming of impeller diameter for maintaining centrifugal pumps[J].Transactions of the Korean Society of Mechanical Engineers:B,2011,35(9):875-882.
[16]史凤霞.离心泵作液力透平的水力学特性及其压力脉动研究[D].兰州:兰州理工大学,2017:29-40.