作　　者： (王强）; (杨具瑞）; (蒋瑜）; (龙远莎）; (万云娇）; (卜宁）;

机构地区： 铜仁学院农林工程与规划学院,铜仁554300

出　　处： 《铜仁学院学报》 2017年第9期40-47,共8页

摘　　要： 随着高水头大单宽流量水电站的快速发展,宽尾墩+阶梯溢流坝+消力池一体化消能工在国内外得到广泛应用,目前工程实践中已认识到WES曲面与阶梯溢流坝的连接形式对宽尾墩+阶梯溢流坝+消力池一体化消能工消能特性影响的重要性。基于阿海电站,采用水气两相流VOF法,辅以三维RNGk-ε湍流数值模型,对由不同大小台阶组合的过渡阶梯的宽尾墩+阶梯溢流坝+消力池一体化消能工的6种方案进行三维数值模拟。研究结果表明:湍动能k及湍流耗散率ε沿阶梯溢流坝面逐渐增大,随着过渡阶梯台阶尺寸的增大,阶梯坝面最大湍动能及最大湍流耗散率逐渐减小;湍动能k及湍流耗散率ε在消力池内分布规律基本一致,主要分布在消力池前端底部和中部的水跃主流区及主流与表面旋滚水流的交界面区域;其中过渡阶梯由1个高×宽=3 m×2.25m的台阶后接3个高×宽=1m×0.75m台阶组合的(方案六)对水流的消能率最高,消能率沿消力池向后从首个计算断面的28.9%增加到最后一个计算断面的55.51%,较其他方案为大。 With the rapid development of high-head,large-width and wide-flow energy dissipater,the flaring pier+staircase overflow dam+stilling basin integrated energy dissipater has been widely used at home and abroad.Now in the engineering practice,the significance of the influence of energy dissipation characteristics of transition steps combined by different size of steps of flaring gate pier+step overflow dam+stilling basin has been recognized.Based on the Ahai power station,this paper used the VOF method of water-gas two-phase flow and three-dimensional RNGk-εturbulence numerical model to simulate the three-dimensional value of the six schemes of energy dissipation characteristics of flaring gate pier+step overflow dam+stilling basin.The results showed:The turbulent kinetic energy k and the turbulent dissipation rateεincreased gradually along the step spillway dam surface’increase,and the maximum turbulent kinetic energy and the maximum turbulence dissipation rate decreased with the increase of the size of the step.The distribution rules of kinetic energy k and turbulence dissipation rateεwere consistent in the stilling basin.They mainly distributed in the front bottom and middle part of hydraulic jump mainstream area in stilling basin,and the interface area between the main flow and the surface spiral water flow.The transitional step that was combined by1step of height×width=3m×2.25m followed by3steps of high×widths=1m×0.75m(scheme6)had the highest energy dissipation rate.And its energy dissipation rate increased from28.9%in the first calculation section to55.51%in the last calculation section,which was larger than other schemes.

关 键 词： 消能率 过渡阶梯 湍动能 方法