三维复杂表面水滴撞击特性计算

为预测多段翼和发动机进气道等三维复杂形状表面在结冰气象条件下的水滴撞击特性,提出了一种基于欧拉两相流模型求解水滴收集系数的方法.空气相和水滴相认为是单相耦合的,空气流场由Euler或Navier-Stokes(N-S)方程独立求得.给出了一种水滴相撞击壁面边界条件的处理方法.为避免因局部水滴容积分数异常而导致计算发散,提出了一种自适应的数值扩散模型以增加高阶计算的稳定性.验证计算了圆柱、MS(1)-0317翼型、球面等典型二三维物面的收集系数,并计算了水滴直径呈某种分布时的情形.与公开发表的试验数据对比表明,计算方法准确有效,能很好的应用于三维复杂表面的水滴撞击特性预测.

Water droplet impingement prediction for three-dimensional complex surfaces

An Eulerian two-phase method was presented to predict water droplets impingement for three-dimensional complex surfaces such as multi-element airfoil and engine inlet under icing conditions.The air-droplet two-phase flow was considered one-way coupled,and the airflow field was solved independently from the Euler or Navier-Stokes(N-S) equations.A treatment of boundary conditions of the droplet phase at the impingement surfaces was given.An adaptive numerical diffusion model was proposed to avoid divergence in higher order simulations caused by the singularity of droplet volume fraction in localized regions.Validation cases were performed for typical two or three dimensional bodies,including a cylinder,a MS(1)-0317 airfoil,a sphere,a multi-element airfoil and an engine inlet.Cases with droplet sizes in certain distribution were also calculated.In comparison with published experimental results,the present computational method is accurate and effective,and applicable to three-dimensional complex surfaces.