Test and analysis on pressure pulsation and hydraulic performance of saddle zone in axial flow pump
HE Naichang1, TAN Minggao1*, LIU Houlin1, HUANG Xin2, WU Xianfang3
1.National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2.Sulzer Sewage Treatment Equipment(Shanghai)Co. Ltd., Shanghai, 200122, China; 3.School of Energy & Power Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China
In order to analyze the running characteristics of axial flow pump in saddle zone, the pressure pulsation and hydraulic performance of saddle zone in an axial flow pump were tested under diffe-rent conditions. The pressure pulsation and hydraulic performance of saddle zone in the axial flow pump were analyzed. The results show that the H-Q curve of the model pump has an obvious saddle zone under small flow rate conditions in the axial flow pump. Saddle zone is in the flow rate range of 0.50Qd-0.60Qd. There is a minimum head at 0.55Qd which is lower than the head at 0.60Qd by 0.33 m. And the difference is 5.5% of design head. The pressure pulsation at the impeller inlet and pump outlet has an obvious time domain periodicity which reflects the four wave crest and trough behavior in one period. The peak-to-peak value of pressure pulsation at the impeller inlet at 0.55Qd is 2.3 times the value under design condition. The pressure pulsation regularity of guide vane middle and outlet is complex. The main frequency at the impeller inlet is the blade passing frequency. The maximum pressure pulsation amplitude is located at the blade passing frequency of 0.55Qd,which is 27.6% higher than the maximum amplitude of the pressure pulsation at design condition. There appear many low-frequency signals at guide vanes middle and outlet under small flow rate conditions and the pressure pulsation is complicated. The main frequency at the pump outlet shows a blade passing frequency at design condition. The research results can provide a reference for the optimization of unstable running characteristics in the axial flow pump.
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