宽尾墩阶梯溢流坝出闸室水舌下缘挑距水力计算

将宽尾墩安置在阶梯溢流坝上游,形成宽尾墩和阶梯溢流坝面相结合的消能设施,水流具有其独特的特点.结合索风营水电站宽尾墩后接台阶式溢流坝消能设施的物理模型实验和数值模拟结果,对出闸室抛物型跌落射流进行了研究,综合出闸室水流的影响因素给出了水舌下缘挑距的计算关系式,分析了堰面坡度和挑坎高度对挑距的影响,并利用已建类似工程的实验数据进行了验算.结果表明,给出的计算公式可供估算类似工程水舌下缘挑距参考应用.

Hydraulic calculation method for deflecting distance of lower nappe profile in dissipator with flaring gate piers and stepped spillway

The flaring gate piers are located at the upstream of the stepped spillway to form a new style united dissipator.Due to the flaring gate piers,the flows behave obvious three-dimensional characteristics.In this paper,a study on the parabolic jet flow from gate chamber was carried out based on the result of the physical model test and numerical simulation on Suofengying hydro plant.From analyzing the primary factors of the outflows,an empirical relationship of deflecting distance of lower nappe profile was obtained.In addition,the influence of slope gradient and bucket's height to deflecting distance was analyzed.With the experimental data of an existed analogous project,it shows that the formula proposed is appropriate for evaluation.