水口电站导流底孔封堵方案中挟气对负压和气蚀的影响

闽江水口电站导流底孔封堵方案研究中提出两截门方案，即先沉放高度9．5m的下截平板门，门项过水，直至最终沉放上截门完全封堵面积为15m×8m的导流孔，由此新方案在上截闸门沉放过程中产生了负压面流、过渡流和挑射流三种工况以及墙顶和侧墙负压、气蚀等复杂情况，本文研究了这些情况并根据模型试验结果，确定圆形或矩形补气孔的挟气减蚀效果，对有关工程问题提出了一些建议．

Effects of Air-Supplementation on Negetive Pressure and Cavitation in Process of Closing Diversion Conduit

In the research on the model test of double-section gate scheme, there were three cases to bc considered, i.e. the negative pressure surface flow, the transition flow and the jet-in sinking or the upper-section gate. At the same time, the cavitation on the top and on the wall or the conduit, as well as the other complex condition were also found. In accordance with the result of the model test, effects or circular or rectangular opening for air-supplementation were evaluated. Some qualitative suggestions were made for engineering.