防射水式门楣对潜孔事故闸门闭门特性影响研究

为降低大型水电站泄洪中孔（或底孔）事故闸门闭门过程中的门体振动，减小门槽及门槽附近区域的脉动压力强度，改善中孔流道流态，以乌东德水电站5号泄洪中孔作为研究对象，建立1〖DK(〗∶〖DK)〗25水工试验模型，研究了事故闸门动水关闭过程中中孔内水流流态、沿程压力及闸门压力等特性，分析了设置通气管、设置防射水式门楣以及常规门楣加高3种方案对闸门闭门动力特性的影响。结果表明：增设防射水式门楣结构可以有效阻断高速水流冲击门体，降低闸门振动，改善中孔流道及闸门受力条件，确保闸门安全、可靠完成动水闭门。相关经验可供类似工程借鉴。

Influence of water-proof gate lintel on closed-door characteristics of submerged emergency gate

To reduce the vibration of the emergency gate of the middle water passage outlet(or the bottom outlet) for large hydropower station in the gate closing process under dynamic water condition, and reduce the intensity of fluctuating pressure in the vicinity of small gate slot as well as gate slot, and improve the flow regime of the middle outlet, taking the No.5 water passage outlet in Wudongde Hydropower Station as the research object, a 1:25 hydraulics test model was established. The flow regime, pressure along the middle outlet and the gate pressure was studied, and the effects of ventilation pipe, water-proof lintel and conventional lintel raising on the gate dynamic characteristic in the closing process were analyzed. The results showed that the design of water-proof lintel structure can prevent the impact of high-speed water flow on the gate effectively, reduce the gate vibration, and improve the force condition of the middle water passage outlet and the emergency gate, finally ensuring the gate to close safely and reliably under the dynamic water.