A study on the unsteady characteristics of the backflow vortex cavitation in a centrifugal pump

PDF(2244 KB)

Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (16) : 24-30.

YUAN Jianping1,HOU Jingsheng1,FU Yanxia2,HU Jiwei2,ZHANG Haoyang2,SHEN Chendong3

Author information +

History +

Abstract

In order to analyze the unsteady characteristics of the backflow vortex cavitation in a centrifugal pump, the standard k-ε turbulence model coupled with the homogenous cavitation model based on the simplified Rayleigh-Plesset equation were applied to simulate the unsteady inner flow in a centrifugal pump named IS65-50-160 at the low flow rate of 0.4Q_d (40% of the design flow rate) through ANSYS CFX 14.5.The developing process of the backflow vortex cavitation as well as the pressure fluctuation at the blade leading edge were obtained and compared with experimental results.The phase-crossing analysis of the monitoring points of pressure pulsation at the blade leading edge was also carried out.The results show that at the low flow rate of 0.4Q_d and as the cavitation number σ is the value of σ=0.056, the patterns of the developing backflow vortex cavitation involving basically three rotating components near the blade leading edge in the whole process will change with the blade rotating.There is no rotating component near the impeller eye.The propagation speed ratios of the three rotating components were 0.35, 0.66 and 1.95, respectively.

Key words

centrifugal pump / inlet backflow vortex cavitation / pressure fluctuation / unsteady numerical simulation / experiment

Cite this article

EndNote

Ris (Procite)

Bibtex

Download Citations

YUAN Jianping1,HOU Jingsheng1,FU Yanxia2,HU Jiwei2,ZHANG Haoyang2,SHEN Chendong3. A study on the unsteady characteristics of the backflow vortex cavitation in a centrifugal pump[J]. Journal of Vibration and Shock, 2018, 37(16): 24-30

References

[1] Fu Yanxia, Yuan Jianping, Yuan Shouqi, et al. Numerical and experimental analysis of flow phenomena in a centrifugal pump operating under low flow rates [J]. Journal of Fluids Engineering, 2015, 011102, 137(1): 1-12.
[2] 付燕霞，沈成栋，袁建平，等. 离心泵进口回流诱导的空化特性 [J]. 排灌机械工程学报，2016，34（10）：842-846.
Fu Yanxia, Shen Chendong, Yuan Jianping, et al. Cavitation characteristic induced by inlet backflow in a centrifugal pump [J]. Journal of Drainage and Irrigation Machinery Engineering, 2016, 34(10): 842-846.
[3] 李意民. 水泵回流理论与研究[J]. 流体机械，1996，23（9）：29-31.
Li Yimin. Theory and research of backflow in pumps [J]. Fluid Machinery, 1996, 23(9): 29-31.
[4] 李意民，王艳芬. 离心式水泵回流现象的研究[J]. 煤炭科学技术,1995,23(3):51-53.
Li Yimin, Wang Yanfen. Research of backflow in centrifugal pump [J]. Coal Science and Technology, 1995, 23(3): 51-53.
[5] 黄建德. 离心泵进口回流的发生机理及预估[J]. 上海交通大学学报，1998，32(7):5-9.
Huang Jiande. Mechanism and prediction of inlet reverse flow onset in centrifugal pump impellers [J]. Journal of Shanghai Jiaotong University, 1998, 32(7): 5-9.
[6] 袁建平，周邦伦，孙威，等. 离心泵进口回流特性的CFD与试验研究 [J]. 中国农村水利水电，2014，7:162--166．
Yuan Jianping, Zhou Banglun, Sun Wei, et al. Research on the inlet recirculation`s in centrifugal pumps based on CFD and experiment methods [J]. China Rural Water and Hydropower, 2014, 7:162-166.
[7] 魏立超，宋文武，石建伟，等. 基于CFD的高速离心泵进口段流动数值模拟分析[J]. 热能与动力工程，2016，31(7)：103-109.
Wei Lichao, Song Wenwu, Shi Jianwei, et al. Numerical simulation and analysis of the flow at the inlet of a high speed centrifugal pump based on the software CFD [J]. Journal of Engineering for Thermal Energy and Power, 2016, 31(7): 103-109.
[8] 史宏超，李意民. 离心泵进口回流及其控制研究 [J]. 水泵技术，2000，3：27-29．
Shi Hongchao, Li Yimin. Research on inlet reflow of centrifugal pump and its control [J]. Pump Technology, 2000, 3: 27-29.
[9] 张金凤，梁赟，袁建平，等. 离心泵进口回流流场及其控制方法的数值模拟[J]. 江苏大学学报，2012，33(4)：402-407.
Zhang Jinfeng, Liang Yun, Yuan Jianping, et al. Numerical simulation of recirculation control at centrifugal pump [J]. Journal of Jiangsu University, 2012, 33(4): 402-407.
[10] 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 Yuchuan, Tan Lei, Cao Shuliang, et al. Characteristics of Transient Flow and Pressure Fluctuation in Impeller for Centrifugal Pump [J]. Journal of Mechanical Engineering, 2014, 50(10): 163-169.
[11] Tan Lei, Zhu BaoShan, Cao ShuLiang, 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.
[12] Tan Lei, Zhu Baoshan, Cao Shuliang, et al. Influence of Prewhirl Regulation by Inlet Guide Vanes on Cavitation Performance of a Centrifugal Pump[J]. Energies, 2014, 7(2): 1050-1065.
[13] 袁建平, 沈陈栋, 刘君,等. 涡动下高速离心泵的内部流动特性研究[J]. 振动与冲击, 2016, 35(11):87-92.
Yuan Jianping, Shen Chendong, Liu Jun, et al. Internal flow characteristic of high-speed centrifugal pumps under whirling of their imp[J]. Journal of Vibration and Shock, 2016, 35(11):87-92.
[14] 邓育轩，李仁年，韩伟，等. 螺旋离心泵内回流涡空化特性[J]. 农业工程学报，2015，31(1):86-90.
Deng Yuxuan, Li Rennian, Han Wei, et al. Characteristics of backflow vortex cavitation in centrifugal pump [J]. Transaction of the Chinese Society of Agricultural Engineering, 2015, 31(1): 86-90.
[15] Tsujimoto Y, Semenvo Y. New types of cavitation instabilities in inducers [C]. Proceeding of the 4th International Symposium on Launcher Technology, Liege, Belgium, 2002.
[16] Yamamoto K, Tsujimoto Y. Backflow vortex cavitation and its effects on cavitation instabilities [J]. International Journal of Fluid Machinery and Systems, 2009, 2(1): 40-54.
[17] ANSYS Inc. Theory reference[M]. ANSYS Inc, 2012.
[18] 尹俊连，刘锦涛，王乐勤，等. 水泵水轮机泵工况小流量区压力脉动预测[J]. 工程热物理学报，2011，32（7）：1141-1144.
Yin Junlian, Liu Jintao, Wang Leqin, et al. Prediction of pressure fluctuations of pump turbine under off-design condition in pump mode [J]. Journal of Engineering Thermophysics, 2011, 32(7): 1141-1144.
[19] Tsujimoto Y. Cavitation Instabilities in inducer [M]. Neuilly-sur-Seine: NATO Research and Technology Organization, 2006.
[20] 王泽军，张幼新. 离心泵汽蚀的压力脉动判据研究[J]. 山东矿业学院学报，1994，13（1）：1-5.
Wang Zejun, Zhang Youxin. Study of pressure pulsation criterion for the cavitation of centrifugal pump [J]. Journal of Shan Dong Mining Institute, 1994, 13(1): 1-5.
[21] Yamamoto K, Tsujimoto Y. Backflow vortex cavitation and its effects on cavitation instabilities [J]. International Journal of Machinery and Systems, 2009, 2(1): 40-54.
[22] Escaler X, Egusquiza E, Farhat M, et al. Detection of cavitation in hydraulic turbines [J]. Mechanical Systems and Signal Processing, 2006, 20(4): 983-1007.