台阶式溢洪道纯台阶消能率变化规律研究

Research on pure step energy dissipation rate change law of stepped spillway

台阶式溢洪道在水利工程泄洪消能中得到了广泛应用,其与光滑溢洪道相比具有较高的消能率。消能率是研究台阶式溢洪道消能特性的重要参数,但其与流动参数间的关系十分复杂,总消能率并不能反映出各台阶的消能效果。本文采用模型试验与数值计算相结合的方法,分析了纯台阶单宽流量、台阶高度、坡度对消能率的影响。研究表明:纯台阶消能率与流量、坡度间存在较好的线性关系,这两个参数可用于研究纯台阶消能特性。

Stepped spillway is widely applied in flood discharge and energy dissipation of water conservancy projects. It has higher energy dissipation rate compared with smooth spillway. The energy dissipation rate is one of the important parameters to study stepped spillway energy dissipation characteristics. However, its relationship with flow parameters is very complex. Total energy dissipation rate does not reflect the effect of each step energy dissipation. In the paper, method combining model test and numerical calculation is adopted for analyzing the influence of pure step per width discharge, step height and slope on energy dissipation rate. Research shows that pure step energy dissipation rate has better linear relationship with discharge and slope. Both parameters can be used for studying pure step energy dissipation characteristics.