离散液滴运动模型研究

汽水分离器和安全壳喷淋系统是核电厂安全可靠运行的关键设备和设施，其运行过程涉及液滴在流场中的运动、碰撞和相变等物理现象。本文采用欧拉 拉格朗日耦合方法首先建立了离散液滴运动模型，包括单/多液滴运动模型、液滴碰撞、流场耦合、液滴相变、液滴产生和液滴消亡等单立模型，及相应的边界条件和空间条件，来描述多液滴在流场中的运动行为；其次给出了离散液滴运动模型的应用实例，来描述自然界蒸发、冷凝和喷雾等物理现象中的离散液滴运动行为；最后指出了现阶段离散液滴运动模型和算法存在的问题，希望感兴趣的学者在离散液滴运动模型研究方面进一步完善和推动其发展。

Study on Discrete Droplet Motion Model

The steam-water separator and the containment spray system are key equipment of nuclear power plant. There are many physical phenomena, such as discrete droplet motion in flow field, droplet collision and droplet phase change etc., during the operation process of the steam-water separator and the containment spray system. Based on the Euler-Lagrange method, the discrete droplet motion model was established, which includes independent models, such as the single and many droplets motion model, the droplet collision model, the two-way-coupling between droplet and continuous flow model, the droplet phase change model, the film droplet produced by bubble bursting at a free water surface model, the droplet extinction model etc., and their boundary conditions, to describe droplet behavior at flow field. Some examples about application of the discrete droplet motion model were shown to describe the discrete droplet motion behavior in the physical phenomena of evaporation, condensation and spray. Finally, some topics about the discrete droplet motion model and its computational method were shown to hope more researchers who have interests to push forward its development.