龙抬头式泄洪洞反弧末端边墙掺气减蚀设施的研究

Study on the sidewall aerators of high head ogee spillways

高水头龙抬头式明流泄洪洞发生空蚀的部位一般位于反弧末端下游边墙及底板上,因此研究该部位的掺气减蚀设施具有十分重要的应用价值。结合二滩水电站1号泄洪洞,研究了反弧段边墙掺气问题,基于掺气挑坎设计中应遵循的基本原则,提出了一种新型的斜侧收缩式掺气挑坎体形,并分析了影响侧收缩掺气挑坎挟气量及挑坎下游水流流态的因素。

The cavitation damage usually appears on the sidewalls and the plate downstream of high head spillway elbow. Therefore, it is very important to study sidewall aeration for safe operation of the ogee spillway tunnel. The sidewall aeration for the first spillway tunnel of Ertan Hydropower Plant is deeply studied in this paper. Basic principles for design of the aerator are described, and a new aerator, that is the side contracted ramp, is presented. Furthermore, factors affecting the flow pattern and aeration are also analyzed.