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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。
Based on the Lagrange method of the study of droplet impact properties, a particle statistical method suitable for investigating unsteady conditions is proposed. By counting the number of particles colliding on different areas on the anti-icing surface at different times in the unsteady flow field, the variation of particle concentration distribution over time on the anti-icing surface is obtained, which is directly related to the chromaticity distribution obtained by the droplet impact test based on the dyeing method The droplet impact characteristics of a certain engine hood shrinkage ratio model were tested by the dynamic image measurement method based on the dyeing method. The particle statistical method was verified. The calculated results obtained by the particle statistics method based on the Lagrange method are in good agreement with the experimental results and have good agreement with the results obtained by the Lagrange method. The physical process simulated by the particle counting method is consistent with the experimental process and has advantages in dealing with the randomness of turbulence and the uneven distribution of incoming liquid water content.