摘要
高拱坝表孔宽尾墩收缩射流水舌的扩散特性与其出口流速分布密切相关,为了求得收缩射流的水力特性,应用RNGk ε双方程湍流模型对高拱坝表孔不同体型及过流量条件下可能出现的降水曲线流态、急流冲击波流态、水跃壅水流态、缓流流态4种流态进行了数值模拟计算,水流自由表面的模拟采用VOF法,得到了溢流水面及流速分布。结果表明,无论在何种流态下,计算所得的水面曲线均与物理模型试验值吻合良好,所得的出口流速分布结构也验证了高拱坝宽尾墩收缩射流水舌不同流态下分散的机理。
The dispersion of the contracted jet from a spillway with flaring gate piers for high arch dams depends on the distribution of the velocity at the exit section of the jet. In this research, a 3-D numerical simulation of spillway with flaring gate piers is presented with the volume of fluid (VOF) method for the free surface flow in order to find out the hydraulic features. The results show that four kinds of flow patterns emerge, depending on the water heads over the weir and the geometrical meters of the flaring gate piers. The discharges and water surface profiles from the numerical modeling agree with the experimental results from different flow patterns, including free over-fall, shockwave, hydraulic jump and subcritical flow, which verifies that the model is suitable in this situation.
出处
《水科学进展》
EI
CAS
CSCD
北大核心
2005年第2期185-188,共4页
Advances in Water Science
基金
教育部优秀博士论文基金资助(200043)~~
