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.
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