排涝泵站立式轴流泵装置模型试验

针对排涝泵站改造工程的需要，开展了立式轴流泵装置模型试验研究，轴流泵装置模型由比转速700的水力模型、肘形进水流道和直管式出水流道组成，获得了模型泵和原型泵装置的能量和汽蚀特性曲线以及飞逸转速特性．在叶轮叶片转角为～4。时，泵装置模型最高效率为76．21％，扬程为6．39m，流量为0．298m3／s；对应的原型泵装置设计工况点扬程6．00m，效率为83．87％．流量为25．9m3／s，满足设计流量的要求；在最高扬程下，轴功率小于2300kW．所选用的水力模型性能满足泵站的实际运行要求，经过优化的直管式出水流道保证了泵装置高效稳定运行．

Model experiment of vertical axial-flow pump system for drainage Pumping Station

In order to meet the requirements for the rebuilding of a drainage pumping station, a model experimental research on characteristics of vertical axial-flow pump system has been conducted. The vertical axial-flow pump model is comprised of a hydraulic model of specific speed 700, an elbow inlet and a straight outlet conduit. Performance and cavity characteristics of the model pump and the prototype pump are obtained, so is the runaway speed characteristics. At - 4° of impeller blades install angle, the maximum efficiency of the model pump is 76.21% with head 6.39m and flow rate 0.298 m3/s. The maximum efficiency of the prototype pump is 83.87% with head 6.00 m and flow rate 25.9 m3/s. At the maximum head, the shaft power of prototype pump is less than 2 300 kW. The hydraulic model and optimal straight outlet conduit meet the operating condition of the pumping station.