In order to study the influence of axial clearance between the front cover plate and the pump body on the axial force,traditional theoretical calculation method was used to obtain the axial force of the pump first, then based on CFX software, RNG k-ε turbulent model and high order algorithm were used to perform numerical simulations for the whole flow field of centrifugal pump. The external cha-racteristics of the pump, static pressure variation between the axial clearance and the axial force of the rotor components were obtained by changing the axial clearance between the impeller front shroud and the pump body. The effects of axial clearance on the hydraulic performance and the axial force of the impeller were analyzed. Through the numerical simulation, it was found that the head and the efficiency of the pump decrease gradually with the increasing of the clearance between the impeller front shroud and the pump body; the static pressure in the impeller and the auxiliary impeller changes a little, and the static pressure changing in the clearance between front cover plate and the pump body is obvious;the axial force of the pump increases first and then decreases with the increase of the clearance between the impeller front shroud and the pump body.The error ratio of the head between numerical simulation result and experiment is 0.84% and the maximum error ratio of the axial force between theo-retical calculation result and numerical simulation is 5.75%.The numerical simulation method verified the accuracy of the axial force of the new type pump by the empirical formula.
LI Cai-Hong-,XUE Zhi-Kuan-,LI Hong-. Effects of axial clearances between impeller front shroud and pump body on axial force[J]. Journal of Drainage and Irrigation Machinery Engin, 2016, 34(4): 295-300.
WANG Yang, LYU Zhongbin, CAO Puyu, et al. Numerical simulation and orthogonal test of baffle in suction chamber of double-suction pump[J].Journal of Jiangsu University(natural science edition), 2014,35(5):525-530.(in Chinese)
LI Wei, SHI Weidong, JIANG Xiaoping, et al. New method for axial force balance of canned motor pump[J]. Transactions of the CSAE, 2012, 28(7): 86-90.(in Chinese)
STEPANOFF A J. Centrifugal and axial flow pumps: theory, design, and application[M]. New York: John Wiley & Sons Inc, 1948.
关醒凡. 现代泵技术手册[M]. 北京:宇航出版社,1995.
VAN HK, BAILEY J, MAJUMDAR A. Numerical prediction of transient axial thrust and internal flows in a rocket engine turbo pump[C]//Proceedings of 35th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit. LosAngeles:[s.n.], 1999.
HU Jingning, PAN Jinqiu, YANG Sunsheng, et al. Axial thrust numerical calculation compared with experimental result of high pressure pump for seawater desalination[J]. Fluid machinery, 2009, 37(7): 8-12.(in Chinese)