过渡式台阶溢洪道的水力特性研究

鉴于台阶式溢洪道的研究多集中于台阶尺寸﹑坡度﹑流态﹑消能等方面,而对台阶本身的布置形式研究很少,提出了新的过渡式台阶溢洪道布置形式,采用紊流数值模拟方法研究了不同坡度﹑不同单宽流量以及不同过渡形式下的过渡式台阶溢洪道的水力特性。结果表明,与连续等高的台阶溢洪道相比,在相同条件下过渡式台阶溢洪道台阶面上的负压区较小,消能率较高且随单宽流量的增加而增加,所提出的台阶布置形式可供相关工程参考。

Hydraulic Characteristics of Transitional-type Stepped Spillways

The study of stepped spillway was focused on the step size, slope, energy dissipation and other issues while seldom studied on the step layout for spillways. A new type of transitional stepped spillway was put forward. The turbulent-flow numerical simulation method was used to analyze the hydraulic characteristics of the transitional stepped spillway under conditions of different slope, unit discharge and different transition type. The results show that under the same conditions, the negative pressure area on the surface of transition type step is smaller. The dissipation rate of the transition type stepped spillways is higher than that of the traditional stepped spillways, and increase with the increase of unit discharge. The proposed step layout for spillways can provide reference for the related project.