双向竖井贯流泵装置物理模型试验及分析

Physical Model Experimental Analysis of Bi-directional Shaft Tubular Pump Device

以江阴市定波水利枢纽工程双向贯流泵站预研为工程背景,对双向竖井贯流泵模型装置开展了能量性能、空化性能及飞逸性能试验,获得了在正、反向运行时双向竖井贯流泵装置的性能试验数据。结果表明:双向竖井贯流泵装置在竖井正向作为进水流道、反向作为出水流道时,竖井流道内部流态均稳定,无大尺度漩涡产生,泵装置运行稳定。在正向设计扬程3.05 m工况时,叶片安放角-4°时双向竖井贯流泵装置的物理模型效率为70.95%;在反向设计扬程1.43 m工况时,叶片安放角-4°时双向竖井贯流泵装置物理模型效率为57.39%;正、反向设计扬程时双向贯流泵叶轮的临界必需汽蚀余量均低于8 m,汽蚀性能优异。在正向最高净扬程2.99 m工况时,原型贯流泵叶轮最大飞逸转速是额定转速的1.5倍;在反向最高净扬程2.57 m时,原型贯流泵叶轮最大飞逸转速是额定转速的1.13倍;叶片安放角越小,单位飞逸转速越高。

Based on the preliminary study of the bi-directional cross-flow pump station of Dingbo Water Conservancy Complex Project in Jiangyin City,the energy performance,cavitation performance and runaway performance tests of the bi-directional shaft cross-flow pump model device were carried out,and the performance test data of the bi-directional shaft cross-flow pump device were obtained when operating in both directions.The results show that when the bi-directional shaft tubular pump device takes the shaft forward as the intake channel and reverse as the outlet channel,the flow pattern in the shaft flow channel is stable,and there is no large-scale vortex generation,and the pump device operates stably.Under the condition of 3.05 m forward design head,the physical model efficiency of the bi-directional shaft tubular pump device is 70.95%at blade placement angle of-4°;57.39%at blade placement angle of-4°and 57.39%at 1.43 m reverse design head;and the critical NPSHr of the bi-directional shaft tubular pump impeller is less than 8 m at forward and reverse design head.The cavitation performance is excellent.The maximum runaway speed of prototype tubular pump impeller is 1.5 times of rated speed when the maximum net head is 2.99 m in forward direction;the maximum runaway speed of prototype tubular pump impeller is 1.13 times of rated speed when the maximum net head is 2.57 m in reverse direction;the smaller the blade placement angle,the higher the unit runaway speed.