活动导叶出水边射流：一种通过调整转轮进口旋涡角度来提高非设计工况水轮机性能的方法  

Wicket Gate Trailing-Edge Blowing： A Method for Improving Off-Design Hydroturbine Performance by Adjusting the Runner Inlet Swirl Angle

作　　者：B J Lewis[美] 崔金声 

出　　处：《国外大电机》2018年第3期58-65,共8页

摘　　要：在最优设计点，水轮机在最高效率运行。但是，随着替代性能源的不断增加，为了维持电网的稳定性，水轮机在非设计工况运行的情况越来越普遍。本文提出一种通过活动导叶出水边狭缝射流来提高水轮机在非设计工况性能的方法。射流在转轮进口处改变了整体流动方向。活动导叶出水边喷嘴引起流动角度改变，从而能够独立地改变经过转轮的流量及旋涡角度，这在目前的设计中只能通过调整活动导叶开口来实现。在适当地调整流动角度后，非设计工况水轮机效率能够得到显著提高。At their best efficiency point （BEP）, hydroturbines operate at very high efficiency. However, with the ever-increasing penetration of alternative electricity generation, it has become common to operate hydroturbines at off-design conditions in order to maintain stability in the electric power grid. This paper demonstrates a method for improving hydroturbine performance during off-design operation by injecting water through slots at the trailing edges of the wicket gates. The injected water causes a change in bulk flow direction at the inlet of the runner. This change in flow angle from the wicket gate trailing-edge jets provides the capability of independently varying the flow rate and swirl angle through the runner, which in current designs are both determined by the wicket gate opening angle. When properly tuned, altering the flow angle results in a significant improvement in turbine efficiency during off-design operation.

关 键 词：水轮机效率 非设计工况 活动导叶 转轮 调整 射流 性能 涡角 

分 类 号：O35[理学—流体力学]