Pump hydraulic stability appraisal by means of energy performances
ZHANG Ren-tian1, 2, ZHU Hong-geng1, YAO Lin-bi2, WEI Jun1
1.College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou, Jiangsu 225009, China; 2.Jiangsu Surveying & Design Institute of Water Resources Co Ltd, Yangzhou, Jiangsu 225009, China
Abstract:In order to evaluate the operational stability of large-scale low-head pumps in design and off-design conditions,based on the basic design theory of blade pumps,main factors affecting their hydraulic stabilities are analyzed,including inlet pre-swirl,outlet circulation axial-vortex and flow separation.Starting from the fundamental equations of blade pumps,a new concept of optimized operational condition was presented.According to the pump energy performances the equations of calculating turbulent losses for appraising pump hydraulic instability are formulated.Some calculations of various specific speeds are made to compare the measured pressure fluctuations with the calculated turbulent losses,and the identical results are obtained.It indicates that the methodology of pump operational stability appraisal by means of energy performances is feasible and realizable.
张仁田;朱红耕;姚林碧;魏军. 用能量特性评价水泵机组水力稳定性[J]. 排灌机械工程学报, 2008, 26(6): 50-54.
ZHANG Ren-tian, , ZHU Hong-geng, YAO Lin-bi, WEI Jun. Pump hydraulic stability appraisal by means of energy performances. Journal of Drainage and Irrigation Machinery Engin, 2008, 26(6): 50-54.
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