Experimental study on cavitation performance of centrifugal pump with impeller having leading edge slots
Chen Hongxun1,2, Lin Yuzhan1, Zhu Bing1
1. Shanghai Institute of Applied Mathematics and Mechanics, Shanghai University, Shanghai 200072, China; 2. Shanghai Key Laboratory of Mechanics in Energy Engineering, Shanghai 200072, China
Abstract：The cavitation performance of a low specific-speed centrifugal pump with impeller having leading edge slots and the conventional one were measured at various flow rates; and the vibration acceleration signals were acquired by the acceleration sensors installed in various locations in the experimental pump casing; eventually the cavitation performance of these two kinds of impellers was compared and the obtained signals indicating the cavitation characteristics were analyzed. The experimental results turn out that a much better cavitation performance has been achieved with the impeller having leading edge slots comparing with the conventional one. After the RMS(root mean square)of the vibration acceleration signals obtained at the Q=26 m3/h condition being analyzed, it was shown that all the normalized energy of the vibration acceleration at three monitoring points increase with decreasing NPSH available; meanwhile, the vibration of the pump with the impeller having leading edge slots is less violent than that with the conventional impeller during the cavitating process. It suggests that the vibration acceleration acquired can monitor the change in the signals effectively before and after cavitation occurs. The signals picked up at the monitoring point near the outlet of the pump is more sensitive to cavitation state, thus this point is more suitable to be used as the cavitation monitoring site compared with the rest monitoring points in this experimental investigation.
陈红勋,, 林育战, 朱兵. 缝隙引流叶轮离心泵空化试验研究[J]. 排灌机械工程学报, 2013, 31(7): 570-574.
Chen Hongxun,, Lin Yuzhan, Zhu Bing. Experimental study on cavitation performance of centrifugal pump with impeller having leading edge slots. Journal of Drainage and Irrigation Machinery Engin, 2013, 31(7): 570-574.
[1]段向阳,王永生,苏永生. 振动分析在离心泵空化监测中的应用[J]. 振动与冲击,2011, 30(4):161-165. Duan Xiangyang, Wang Yongsheng, Su Yongsheng. Vibration analysis applied in cavitation monitoring of a centrifugal pump[J].Journal of Vibration and Shock, 2011, 30(4): 161-165.(in Chinese)[2]苏永生,王永生,段向阳. 离心泵空化试验研究[J]. 农业机械学报,2010, 41(3):77-80. Su Yongsheng, Wang Yongsheng, Duan Xiangyang. Cavitation experimental research on centrifugal pump[J]. Transactions of the Chinese Society for Agricultural Machinery, 2010, 41(3):77-80.(in Chinese)[3]郝点,周昌静,张志飞. 相关小波分析用于离心泵初生汽蚀诊断[J]. 石油大学学报:自然科学版,2005, 29(2):78-82. Hao Dian, Zhou Changjing, Zhang Zhifei. Diagnosis of inception cavitation in centrifugal pump using wavelet combined with autocorrelation method[J]. Journal of the University of Petroleum, China:Edition of Natural Science, 2005, 29(2): 78-82.(in Chinese)[4]杨敏官,孙鑫恺,高波,等. 离心泵内部非定常空化流动特征的数值分析[J]. 江苏大学学报:自然科学版,2012, 33(4):408-413. Yang Minguan, Sun Xinkai, Gao Bo, et al. Numerical analysis of unsteady cavitating flow characteristic in centrifugal pump[J]. Journal of Jiangsu University:Natural Science Edition, 2012, 33(4):408-413.(in Chinese)[5]梁超. 压力脉动法在离心泵汽蚀故障诊断中的研究[D].长春:东北电力大学能源与机械工程学院,2010.[6]Wu Dazhuan, Wang Leqin, Hao Zongrui, et al. Experimental study on hydrodynamic performance of a cavita-ting centrifugal pump during transient operation[J]. Journal of Mechanical Science and Technology, 2010, 24(2):575-582.[7]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 Jiegang, Zhang Shengchang, Deng Hongying, 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.(in Chinese)[8]陈红勋,刘卫伟,见文,等. 基于流动控制技术的低比转数离心泵叶轮研发[J]. 排灌机械工程学报,2011, 29(6):466-470. Chen Hongxun, Liu Weiwei, Jian Wen, et al. Development of low specific-speed centrifugal pump impellers based on flow control technique[J]. Journal of Drainage and Irrigation Machinery Engineering, 2011, 29(6):466-470.(in Chinese)[9]李随波. 缝隙引流叶片对低比转数离心泵性能影响的试验研究[D]. 上海:上海大学上海市应用数学和力学研究所,2011.[10]岳桂杰,保承军,徐德权. 离心泵振动监测与诊断方法初探[J]. 机械研究与应用,2006(2):70-71. Yue Guijie, Bao Chengjun, Xu Dequan. The discussion of vibration monitoring and diagnostic methods for centrifugal pump[J]. Mechanical Research and Application, 2006(2):70-71.(in Chinese)
