孔板泄洪洞水流三维数值模拟研究

Numerical Simulation of Three-dimensional Flow through Flood-discharge Tunnel with Orifices

采用k-ε紊流模型模拟小浪底水电站9#孔板泄洪洞三维水流运动,利用试验资料对其计算结果进行了验证,数值模拟结果与原型试验数据吻合性良好.通过对数值模拟结果的分析,获得了流速、压力和紊动能等水力要素的分布规律,发现三者均在孔板附近剧烈变化,详细地反映出孔板泄洪洞的消能特性.数值模拟结果表明用k-ε紊流模型来研究孔板消能的水力特性是可行的,可以与物理模型并用,需更为深入研究内部机理和消能特点,为孔板泄洪洞的应用提供可靠的参考依据.

Numerical simulations are conducted with a k-ε two-equation turbulence model to simulate the three-dimensional turbulent flow in No.9 flood-discharge tunnel with orifices of Xiaolangdi Hydropower Station.The results of the simulation are compared with the results from experiments and in agreement with each other.Through analysis for the results of the simulations,the distribution regulationis obtained about the flow velocity and the pressure as well as the turbulent kinetic energy,there are changed obviously near the orifices.The energy dissipation characteristics are investigated in detail as well.The numerical results indicate that it is feasible to use k-ε two-equation turbulence model to simulate the flow in orifice energy dissipator.It can be used to investigate the mechanism and the energy dissipation characteristics of orifice energy dissipator in details,which could give reference to the application of orifice energy dissipator.