Study on shape optimization of energy dissipation structure in flood discharge bottom hole of hydropower station
ZHANG Yao1, YIN Jinbu1*, WU Xijie1, WU Wei1, GONG Gang2
1. College of Water Resources and Architectural Engineering, Northwest Agricultural and Forestry University, Yangling, Shaanxi 712100, China; 2. PowerChina Guiyang Engineering Corporation Limited, Guiyang, Guizhou 550081, China
Abstract：As one of the important components of the flood discharge of the dam body, the energy dissipation design of the bottom orifice has an important influence on the safety and efficienty of the project. In view of the problem that the energy dissipation area of a hydropower station is narrow and the tailrace comal of the left bank power station is easily affected, according to the idea of guiding the water tongue to the center of the stilling basin, the shape of the flip-flow guidance scheme and the surface flow diffusion scheme was modified. Finally, the recommended shape was the surface flow diffusion energy dissipater. The flow pattern, time-averaged pressure, pulsating pressure, velocity distribution, scouring characteristics and energy dissipation rate of the original design shape and the recommended shape were compared and studied by means of model test and numerical simulation.The results show that the energy dissipation effect of the original narrow slit scheme is good, but the mainstream of the water tongue is concentrated on both sides of the left and right banks, resulting in local scour on both sides. The surface flow diffusion scheme allows the discharge of water to form a free surface flow pattern, and rapidly diffuses to the whole river channel. The energy dissipation area is expanded, which effectively reduces the time-averaged pressure, pulsating pressure and bottom velocity of the bottom plate, with the velocity and pressure distribution becoming more uniform. The scour pit depth of the downstream river channel is reduced by 34%, and the scour range is reduced by 35%, which ensures the safe operation of the left bank power station. The recommended scheme can provide reference for similar projects.
张曜,尹进步*,吴西杰,吴伟,龚刚. 某水电站泄洪底孔消能工体型优化[J]. 排灌机械工程学报, 2024, 42(): 403-409.
ZHANG Yao,YIN Jinbu*,WU Xijie,WU Wei,GONG Gang. Study on shape optimization of energy dissipation structure in flood discharge bottom hole of hydropower station. Journal of Drainage and Irrigation Machinery Engin, 2024, 42(): 403-409.
