摘要
宽尾墩与阶梯溢流坝联合消能是一种新型坝面泄流形式的消能工。由于宽尾墩和阶梯的共同作用,其水流表现为很强的三维特性,水气二相混掺剧烈,目前对其流场的三维数值模拟还未见报道,本文采用双方程紊流模型对X型宽尾墩-阶梯溢流坝联合消能的三维流场进行了全场数值模拟,给出了压力特性、流速分布、阶梯及宽尾墩墩后水气两相流的部分特性,计算结果与模型试验数据对比,两者吻合良好,计算发现,在第一级阶梯脱体处存在负压,随后在试验中得到了验证。研究结果表明,采用X型宽尾墩-阶梯溢流坝联合消能,阶梯坝面上能形成明显的纵、横向旋滚,提高了消能效果。
The combination of stepped spillway with flaring gate pier is a new type of energy dissipater for overflow dam. In this paper the double k-ε equations turbulent model is applied to numerically simulate the characteristics of overflow. The calculated pressure distribution, velocity distribution and the regime of aerated flow well agree with model test result. It is concluded that the combination of stepped surface with X-shape flaring gate pier remarkably enhances the efficiency of energy dissipation due to the longitudinal and transverse eddies taken place on the stepped dam surface.
出处
《水利学报》
EI
CSCD
北大核心
2004年第8期15-20,共6页
Journal of Hydraulic Engineering
基金
教育部博士点基金
关键词
X型宽尾墩
阶梯溢流坝
数值模拟
X-shape flaring gate pier
stepped spillway
numerical simulation
double k-ε equations turbulence model
