立式轴流泵装置外特性试验研究

Experimental study on external characteristics of vertical axial flow pump

为进一步了解具有蜗壳式出水流道轴流泵装置的外特性,确保泵站完建后的安全稳定运行,以涧沟泵站泵装置模型试验结果为基础,研究了涧沟泵站泵装置的水力性能,并根据试验结果优选该泵站的运行方案。试验结果表明:该泵站以叶片角度-2°运行时,流量和扬程均满足设计要求,泵装置可以达到最高效率71.4%;随着扬程的增大,流量降幅减小,符合排涝泵站需长时间大流量排涝的经济性要求;该泵装置汽蚀性能符合设计要求,叶片角度为-4°时,飞逸转速达到最高值,最高值小于2倍的额定转速,飞逸特性优良。此试验泵装置作为排涝泵装置时各项性能较为优异,具备深入研究开发的价值,可为扬程相近、流量较大的排涝工程设计提供参考。

In order to further study the external characteristics of axial flow pump device with volute outlet channel for ensuring the safe and stable operation of Jiangou pump station after construction,the hydraulic performance of Jiangou pump station was studied based on the model test and its optimized operation scheme.The result shows that when the pump station works with the blade angle of−2°,the pump device could operate with the highest efficiency of 71.4%,and the flow and head are similar to the designed condition,indicating that it can be used as the designed angle for the future operation of the pump station.With the gradual increase of head,the flow decreases gently,which satisfies the economic requirements of long-time and large flow drainage of the pumping station.Additionally,the cavitation performance of the pump device has met the design requirements and when the blade angle is−4°,the runaway speed reaches the highest value which is less than twice the rated speed,in which the runaway characteristics are excellent.In conclusion,the performance of the tested pump device is relatively excellent as a drainage pump device which has the great value of in-depth research and development.This study can provide some reference for the design of drainage projects with similar heads and large flow rates.