水滴撞击特性的高效计算方法

An efficient method to simulate water droplet trajectory and impingement

针对拉格朗日方法计算水滴撞击特性效率低、通用性差等问题,发展了一种水滴撞击特性的高效计算方法。在求解绕流流场的基础上,结合逐级结构化管理的边界信息存储方式,采用目标扩散追踪方法对水滴所在网格单元进行快速计算,并插值得到该点处的流场信息,逐个求解水滴运动方程得到各水滴的运动轨迹,从而确定水滴撞击极限、收集系数等撞击特性参数。通过对NACA0012翼型、GA-W(1)两段翼型和某三段翼型的计算得到不同状态下的水滴撞击特性,计算结果表明,该方法与传统方法相比具有计算效率高、结果可靠、通用性好等优点。

Ice formation on aircraft is of great safety concern because icing may lead the aircraft to a dangerous situation quickly.Numerical method for determining the trajectories of the water droplets is the base of the icing research and the design of the anti-icing system.The traditional Lagrangian method for simulating water droplet trajectory and impingement has some shortages such as lower computation efficiency and poor applicability currency in peculiar geometry.In order to overcome these shortages,an improved Lagrangian method was developed.It′s based on the calculation of the flow field around icing surface,using a method of searching extended target to calculate the droplet location and determining the insert value of flow field information at the droplet location in a grid cell,the boundary of the droplet trajectories are judged based on a manage system of boundary information with framework structure.The method can overcome theses shortages meanwhile maintaines the robustness of original method.Local droplet collection and impingement efficiency at NACA0012 and multi-element airfoils are calculated with this method in order to verify its correctness.The results show that the improved method is very efficient,reliable,and robust. Furthermore,it can be used in different geometries directly.