挑流水舌入水喷溅的水滴生成数值模型研究  

Study on numerical model of water droplet generation caused by water jet plunging into scour pool

作　　者：何贵成 张华[1] 彭燕祥 HE Guicheng;ZHANG Hua;PENG Yanxiang(School of Water Resources and Hydropower Engineering,North China Electric Power University,Beijing 102206,China)

机构地区：[1]华北电力大学水利与水电工程学院,北京102206

出　　处：《水力发电学报》2023年第9期1-10,共10页Journal of Hydroelectric Engineering

基　　金：国家自然科学基金项目(52279065)。

摘　　要：挑流泄洪雾化与水滴的生成及运动特性密切相关,其中水滴的生成问题是一个关键。本研究使用欧拉方法和拉格朗日方法相结合,提出了一种新的数值模型,用于模拟挑流水舌入水喷溅的水滴生成。首先,采用流体体积法获取挑流水舌的形态、速度和湍流动能等背景场信息。然后,利用液滴破碎的能量平衡理论构建特征参数,计算喷溅水滴的生成位置和数量。最后,使用拉格朗日方法追踪水滴的运动轨迹,并将模拟结果与水工模型试验数据进行对比。结果表明,模拟获得的水舌挑距、水滴生成位置、水滴群分布和降雨强度分布与水工模型试验的观测情况和数据高度一致,验证了模型的准确性,为挑流泄洪雾化研究提供了新思路。Atomization of jet nappes in flood discharge is closely related to the moving behaviors of splashed water droplets,and its droplet generation is a key issue.This paper develops a numerical model of water droplet formation by coupling the Eulerian and Lagrangian methods.First,the volume of fluid method is used to simulate flow patterns,flow velocity,and turbulent kinetic energy of the flow in the scour pool.Then,by the energy balance theory of droplet breakup,characteristic parameters are constructed to calculate the position and quantity of water droplets splashed out from the jet nappe plunging into the pool water body.Finally,the Lagrange method is used to track the trajectories of droplet movement,and the results are compared with the experimental data of a hydraulic model.The results show that the simulations-of water jet distance,water droplet generation position,water droplet group distribution,and rainfall intensity distribution-are in good agreement with the measurements,verifying the accuracy of the model and a new idea for further studying jet atomization in flood discharge.

关 键 词：泄洪雾化 挑流水舌 流体体积法 水滴生成数值模型 水滴群 降雨强度 

分 类 号：TV135.2[水利工程—水力学及河流动力学]