For fluid-structure interaction problems of centrifugal pump cavitation, centrifugal pump cavitation was simulated numerically based on the full cavitation and gas-liquid two-phase model, and the deformation of the rotor system was simulated under different cavitation conditions using one-way coupling. Cavitation bubbles on the impeller, static pressure, relative liquid velocity distribution of centrifugal pump and pressure pulsation in volute, impeller radial force characteristics were analyzed, the effect on the internal flow field and rotor system deformations were studied. The results show that the vapor volume fraction and area on blade suction surface are larger than blade pressure surface, impeller static pressure distribution is more uneven with cavitation development. The bubbles on the impeller will plug flow channel under serious cavitation, results in flow separation phenomenon, then vortex is generated. Cavitation lead to the increase of pressure fluctuation in volute and irregular distribution of radial force. Cavitation has an effect on the deformation of centrifugal pump rotor system, impeller appears non-axisymmetric deformation caused by vortex under cavitation condition.
[1] 高波, 孙鑫恺, 杨敏官, 等. 离心泵内空化流动诱导非定常激励特性[J]. 机械工程学报, 2014, 50(6): 199-205.
GAO Bo, SUN Xin-kai, YANG Min-guan, et al. Characteristics of unsteady excitation induced by cavitating flow in centrifugal pumps[J]. Journal of Mechanical Engineering, 2014, 50(6): 199-205.
[2] 牟介刚, 张生昌, 邓鸿英, 等. 离心泵汽蚀判据的研究[J]. 农业机械学报, 2006, 37(9): 97-99.
MOU Jie-gang, ZHANG Sheng-chang, DENG Hong-ying, et al. Research and discussion of cavitation criterion of centrifugal pump[J]. Transactions of the Chinese Society for Agricultural Machinery, 2006, 37(9): 97-99.
[3] 蒋爱华, 张志谊, 章艺, 等. 离心泵噪声研究的综述与展望[J]. 振动与冲击, 2011, 30(2): 77-84.
JIANG Ai-hua, ZHANG Zhi-yi, ZHANG Yi, et al. Review and outlook of studying on noise of centrifugal pumps[J]. Journal of Vibration and Shock, 2011, 30(2): 77-84.
[4] 谭磊, 王玉川, 曹树良, 等. 离心泵蜗壳区非定常流动特性[J]. 北京理工大学学报, 2014, 34(7): 670-675.
TAN Lei, WANG Yu-chuang, CAO Shu-liang, et al. Characteristic of unsteady flow around the tongue region in a centrifugal pump[J]. Transactions of Beijing Institute of Technology, 2014, 34(7): 670-675.
[5] 王玉川, 谭磊, 曹树良, 等. 离心泵叶轮区瞬态流动及压力脉动特性[J]. 机械工程学报, 2014, 50(10): 163-169.
WANG Yu-chuang, TAN Lei, CAO Shu-liang, et al. Characteristics of transient flow and pressure fluctuation in impeller for centrifugal pump[J]. Journal of Mechanical Engineering, 2014, 50 (10): 163-169.
[6] Ji B, Luo X W, Peng X X, et al. Numerical analysis of cavitation evolution and excited pressure fluctuation around a propeller in non-uniform wake[J]. International Journal of Multiphase Flow, 2012, 43(6): 13-21.
[7] Luo X W, Zhang Y, Peng J Q, et al. Impeller inlet geometry effect on performance improvement for centrifugal pumps[J]. Journal of Mechanical Science and Technology, 2008, 22(10): 1971-1976.
[8] Tan L, Zhu B S, Cao S L, et al. Numerical simulation of unsteady cavitation flow in a centrifugal pump at off-design conditions[J]. Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 2014, 228(11): 1994-2006.
[9] Tan L, Zhu B S, Cao S L, et al. Influence of prewhirl regulation by inlet guide vanes on cavitation performance of a centrifugal pump[J]. Energies, 2014, 7(2): 1050-1065.
[10] 谭磊, 曹树良, 桂绍波, 等. 带有前置导叶离心泵空化性能的试验及数值模拟[J]. 机械工程学报, 2010, 46 (18): 177-182.
TAN Lei, CAO Shu-liang, GUI Shao-bo, et al. Experiment and numerical simulation of cavitation performance for centrifugal pump with inlet guide vane[J]. Journal of Mechanical Engineering, 2010, 46 (18): 177-182.
[11] 肖若富, 王娜, 杨魏, 等. 复合叶轮改善双吸式离心泵空化性能研究[J]. 农业机械学报, 2013, 44(9): 35-39.
XIAO Ruo-fu, WANG Na, YANG Wei, et al. Improvement of cavitation characteristics of double suction centrifugal pump with compound impeller[J]. Transactions of the Chinese Society for Agricultural Machinery, 2013, 44(9): 35-39.
[12] Cudina M, Prezelj J. Detection of cavitation in situ operation of kinetic pumps: effect of cavitation on the characteristic discrete frequency component[J]. Applied Acoustics, 2009, 70(9): 1175-1182.
[13] Rivhard B M. Performance analysis of cavitating flow in centrifugal pumps using multiphase CFD[J]. ASME Journal of Fluids Engineering, 2002, 124(2): 377-383.
[14] 王秀礼, 袁寿其, 朱荣生, 等. 离心泵汽蚀过渡过程瞬态特性分析[J]. 西安交通大学学报, 2012, 46(7): 38-43.
WANG Xiu-li, YUAN Shou-qi, ZHU Rong-sheng, et al. Analysis on transient hydraulic characteristics of cavitation process in centrifugal pumps[J]. Journal of Xi’an Jiaotong University, 2012, 46(7): 38-43.
[15] Yedidiah S. Oscillations at low NPSH caused by flow-conditions in the suctions in pipe[J]. ASME Cavitation and Polyphase Flow Forum, 1994, 5: 27-28.
[16] Zhang Y, Hu S B, Zhang Y G, et al. Optimization and analysis of centrifugal pump considering fluid-structure interaction[J]. The Scientific World Journal, 2014, 2014: 1-9.
[17] 蒋爱华, 李国平, 周璞, 等. 离心泵流体激励力诱发的振动:蜗壳途径与叶轮途径[J]. 振动与冲击, 2014, 33(10): 1-7.
JIANG Ai-hua, LI Guo-ping, ZHOU Pu, et, al. Vibration incited by fluid forces on centrifugal pump from volute path and impeller path[J]. Journal of Vibration and Shock, 2014, 33(10):1-7.
[18] Kato C, Yamade Y, Wang H, et al. Prediction of the noise from a multistage centrifugal pump[C]. ASME FEDSM2005, 2005 , Houston, texas.
[19] 张金凤, 王文杰, 方玉建, 等. 分流叶片离心泵非定常流动及动力特性研究[J]. 振动与冲击, 2014, 33(23):37-41.
ZHANG Jin-feng, WANG Wen-jie, FANG Yu-jian, et al. Influence of splitter blades on unsteady flow and structure dynamic characteristic of a molten salt centrifugal pump[J]. Journal of Vibration and Shock, 2014, 33(23):37-41.
[20] Pei J, Yuan S Q, Yuan J P. Dynamic stresses analysis in a sewage centrifugal pump impeller based on two-way coupling method[J]. Chinese Journal of Mechanical Engineering, 2014, 27(2): 369-375.