水滴撞击特性的粒子统计法研究

基于水滴撞击特性研究的拉格朗日方法,提出了适合于考察非定常情况的粒子统计法.通过统计非定常流场中不同时刻撞击在防冰表面上不同区域的粒子数,获得防冰表面上粒子浓度分布随时间的变化情况,与基于染色法水滴撞击试验获得的色度分布具有直接对应关系;采用基于染色法的动态图像测量方法对某型发动机帽罩缩比模型开展了水滴撞击特性试验,对所提粒子统计法进行了验证.基于拉格朗日方法的粒子统计法获得的计算结果与试验结果符合较好,与采用拉格朗日轨迹法获得的结果具有较好的一致性.粒子统计法所模拟的物理过程与试验过程一致,在处理湍流随机性和来流液态水含量分布不均等方面具有优势.

Research on Particle Statistic Method of Water Droplet Impingement Characteristics

A statistic method on Lagrangian method is proposed based, which is suitable for use in the research of water droplet impingement characteristics in an unsteady flow. By counting the number of particles which impact on different regions of an anti-ice surface at different times, the time history of particle concentration distribution on the anti-ice surface is obtained, and the results are directly related with the chroma distribution obtained by water droplet impingement experiments. Such experiments are carried out on a scaled model of an engine dome which is used to verify the statistic method proposed in this paper. The calculation results obtained through the statistic method fit with the experimental results commendably, and are consistent with the results calculated by Lagrangian trajectory method. The physical process simulated by the statistic method is in agreement with that of the experiment, and is superior in treating such unsteady effect as the randomicity of turbulent flow and the nonuniform distribution of liquid water content contained in the coming flow.