窄缝挑坎收缩段急流冲击波及其控制水深的计算

Calculations of Shock Waves and Controlling Water Depth in Region of Contraction on Slit-type Flip Bucket

本文首先对适用于宽浅明渠的伊本冲击波理论进行了分析,并给出了计算波角的近似显函数解析表达式,改变了长期以来通过查图计算波角的方法。然后将其修正并应用于窄缝挑坎收缩段急流冲击波的水力计算中,给出了波角及收缩始端波前下游水深的半经验计算式,最后还给出了挑坎末端控制水深的计算式。这些成果可供设计时参考。

In this paper, on the basis of Ippen's thcoty of supercritical shock wavc, a formula for calculating the wave angle has been provided. This formula can direetly be applied compute the angle of the supereritieal shock wavc and the original way of the caleulation of the angle by cheeking graphs has been replaced.With some modification,the formula can bc cmployed in the hydraulic calculalion for the slit-type bucket, an cmpirieal cocffieient is introduced. Therefore, the formula for calculating the angle of shock wave on slit-type flip bucket is obtained. The results proposed in this paper can be referred to in the dcsign stage.