溢洪道贴角斜挑坎挑流水舌水力特性研究

溢洪道出口挑坎体型的设计会依据工程的需求而有所不同.通过模型试验和数值模拟结合的方法,将常规的斜切式挑坎与加贴角的斜切式挑坎的水舌形态、水舌挑距、挑高、水舌及下游紊动能和紊动能耗散率进行比较分析,得出了加贴角后斜挑体型的新的特征.对于狭窄河道大交角溢洪道,加贴角斜切式挑坎能够使挑流翻转偏向一侧,有利于挑流的归槽,减小了入水宽度和对单侧岸坡的冲刷,且挑流在空中运动时紊动剧烈,砸落水垫时紊动能耗散迅速,有利于下游消能防冲.

Hydraulic characteristics of spillway fillet slanted pick

The designs of flip bucket forms about spillway are different with the engineering requirements. New characteristics of fillet beveled flip bucket are found through the research of physical model and numerical simulation which have analyzed their difference in water jets about shape, horizontal length, height, energy of turbulence, and turbulence dissipation rate. For the spillway with large angle in narrow channel, fillet beveled flip bucket can reverse the flow to another side, retain the flow to main channel and decrease width of the flow and scour to the bank. Moreover, water jets turbulent violently in the air and energy dissipate quickly when the water hit the plunge pool which are beneficial for energy dissipation and erosion control in the downstream.