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为了探究阶梯—深潭结构在不同流量工况下的消能机理,采用紊流数值模拟方法分析研究了阶梯—深潭结构紊动能、紊动能耗散率、流场结构、潭底压力强度等主要水力参数。结果表明,随着流量的增大,平均紊动能耗散率不及平均紊动能增加速率快,验证了阶梯—深潭随着流量的增加消能率会有所下降;小流量工况下深潭内环流区明显,增大了水流滞留潭区时间,能量耗散效果较优;大流量工况下流量的增加促使结构发生自适应调整,水深加大,形成水垫及漩滚耗能,水流阻力增大且维持潭底压差分布趋于平稳,削弱了主流对河床的直接冲刷,有利于河床稳定。
In order to explore the energy dissipation mechanism of ladder-deep pool structure under different flow conditions, the turbulence numerical simulation method was used to analyze the turbulence energy, the turbulence energy dissipation rate, the flow field structure, the pressure intensity at the bottom of the pool The main hydraulic parameters. The results show that with the increase of flow rate, the average turbulence energy dissipation rate is less than the average turbulent acceleration increasing rate, which verifies that the energy dissipation rate of the ladder-deep pool decreases with the increase of the flow rate. When the flow rate is low, The circulation area is obvious, which increases the time when the water is stagnant in the lake area, and the energy dissipation effect is better. The increase of the flow rate under the large flow rate condition causes the structure to be adaptively adjusted and the water depth increases, forming the water cushion, Increase and maintain the pressure distribution at the end of the pond tends to be stable, weakening the mainstream of the direct erosion of the riverbed, is conducive to the stability of the riverbed.