疏勒河青羊沟水电站枢纽挑流消能鼻坎设计与优化

青羊沟水电站枢纽采用挑流消能设计,枢纽布置为3孔泄洪表孔和1孔泄洪冲沙表孔。枢纽下游河床非常狭窄,宽度仅为20余m,消能防冲设计难度大,对挑流鼻坎在不同流量下的水力性能要求很高。原设计采用宽尾墩结合扭曲式鼻坎消能,左右表孔出口水流对两岸坡脚有直接冲刷,且对下游河道的冲刷深度较大。针对原设计水流冲刷两岸及冲深较大的问题,结合枢纽水工模型试验,优化了鼻坎体型,使挑坎结构布置安全、合理,并满足运行要求。

Design and optimization of flip trajectory bucket for Qingyanggou Hydropower Station on Shulehe River

The design of flip trajectory bucket is adopted for the project of Qingyanggou Hydropower Station with the project layout of 3 surface overflow bays and 1 discharging and flushing sluice. The downstream river bed of the project is quite narrow and the width is only about 20 m， and then the design of the energy dissipation and scouring protection is very difficult， furthermore， the requirement on the hydraulic characteristics of the flip trajectory bucket under various discharges is very high as well. In the original design， the flaring gate pier integrated with distorted type flip bucket is adopted; with which the slope toes of both the banks are directly scoured by the water flow from outlets of both the right and left surface bays with the scouring on the downstream river channel with a larger depth. Aiming at the problem of the scouring on both the banks with a larger scouring depth from the discharge in the original design， the shape of the flip bucket is optimized based on the hydraulic model test of the project， so as to make the layout of the flip bucket more safe and reasonable， thus satisfy the operation requirement concerned.