不同活动导叶对水泵水轮机飞逸特性的影响

The Influence of Different Guide Vanes of Pump-turbine on Runaway Characteristics

以水泵水轮机活动导叶翼型为主要研究对象,选取活动导叶开度11、33、41 mm,分析不同活动导叶翼型对水泵水轮机飞逸特性的影响,为水泵水轮机活动导叶翼型的设计及优化提供方法和理论指导。结果表明:在3种导叶开度下,改进的活动导叶翼型对机组的“S”特性存在较佳的改善效果;改进导叶翼型后机组在飞逸工况运行时其内部流动状态有所改善,活动导叶-转轮区域速度流线分布均匀,涡核集中分布区域减少;改进导叶翼型后不同开度下无叶区监测点的压力脉动振幅相对值有不同程度的减小,速度脉动曲线比改进前平缓,速度峰值较小;改进导叶翼型后尾水管内涡核集中分布区域减少,机组可以在较为稳定的状态下运行。

With the guide vane of the pump-turbine as the main research object,the guide vane opening of 11,33 and 41 mm is selected to analyze the influence of different guide vane airfoils on runaway characteristics of pump-turbine,so as to provide methods and theoretical guidance for the design and optimization of guide vane airfoil of pump-turbine.The results show that the improved guide vane airfoil has a better improvement effect on the"S"characteristics of the unit under three kinds of guide vane openings.After the improvement of the guide vane airfoil,the internal flow state of the unit is improved on runaway characteristics.The velocity streamlines in the guide vane and runner area are evenly distributed,and the concentrated distribution area of vortex core is reduced.After the improvement of guide vane airfoil,the relative value of pressure pulsation amplitude of monitoring points in vaneless area at different openings decreases in different degrees,and the velocity pulsation curve is gentle and the velocity peak value is smaller than before the improvement.The concentrated distribution area of vortex core in the draft tube of the improved guide vane airfoil is reduced,and the unit can operate in a relatively stable state.