过渡阶梯大小对一体化消能工消能特性的影响研究

发布时间：2018-11-22 19:47

【摘要】：由"宽尾墩+阶梯溢流坝+消力池"组成的一体化消能工在现代高水头大单宽泄流量的水利水电工程建设中得到广泛的应用。基于阿海水电站,研究了WES曲面与阶梯溢流坝连接处的连接形式对该消能工水力特性的影响。采用水气两相流VOF计算方法辅以三维RNG k-ε湍流数值模型,对分别由12个0.5 m×0.375 m(高×宽)台阶、6个1 m×0.75 m(高×宽)台阶、3个2 m×1.5 m(高×宽)台阶以及2个3 m×2.25 m(高×宽)台阶组成的过渡阶梯进行三维数值模拟。研究结果表明:随着过渡阶梯台阶尺寸的增大,溢流坝面最大湍流动能k逐渐减小,最大湍流耗散率ε逐渐增大,消能率也将逐渐增大;k及ε在消力池内分布规律基本一致,主要分布在消力池前端的底部和中部。由2个3 m×2.25 m(高×宽)台阶组成的过渡阶梯消能效果最好。
[Abstract]:The integrated energy dissipator composed of a "wide tail pier stepped overflow dam stilling pool" has been widely used in the construction of modern water conservancy and hydropower projects with high water head and large single wide discharge. Based on the Ahai Hydropower Station, the influence of the connection form of the WES surface and the stepped overflow dam on the hydraulic characteristics of the energy dissipator is studied. The VOF calculation method of water and gas two-phase flow is combined with a three-dimensional RNG k- 蔚 turbulent numerical model. The numerical results show that there are 12 0.5 m 脳 0.375 m (height 脳 width) steps and 6 1 m 脳 0.75 m (height 脳 width) steps, respectively. Three transition steps composed of 2 m 脳 1.5 m (height 脳 wide) steps and 2 3 m 脳 2.25 m (high 脳 wide) steps were numerically simulated. The results show that the maximum turbulent kinetic energy k decreases gradually, the maximum turbulent dissipation rate 蔚 increases and the energy dissipation rate increases with the increase of the step size of the transition step. The distribution of k and 蔚 in the stilling pool is basically the same, mainly in the bottom and middle of the front end of the stilling pool. The energy dissipation efficiency of the transition step is the best, which consists of 2 steps (3 m 脳 2.25 m) (height 脳 width).
【作者单位】：铜仁学院农林工程与规划学院;昆明理工大学现代农业工程学院;
【基金】：国家自然科学基金资助项目(51569010)
【分类号】：TV135.2

【相似文献】