过冷大水滴变形及阻力特性的温度影响实验研究

摘要

In order to explore the influence of temperature on the dynamic characteristics of the supercooled large droplet (SLD),SLD dynamics experiments were conducted in room tem-perature and low-temperature environments.Studies have shown that:when a supercooled large droplet is moving in a rapidly accelerated stream,the changing history of the drop’s deformation characteristics and drag characteristics with the variation of the We number can be divided into three stages:fluctuation stage,step stage and smooth stage,and it is subj ected to the influence of the low-temperature environment.The deformation rate and drag coefficient of the droplet with the same We number decrease with decreasing temperature.In the fluctuation phase,tem-perature has the largest influence on SLD dynamic characteristics,but the temperature effect weakens in the step and smooth stage.%为探索温度对过冷大水滴(SLD)变形及阻力特性的影响规律，在常温和低温环境下开展了过冷大水滴动力学特性的实验研究。研究表明：过冷大水滴在快速加速气流中运动时，水滴变形特征和阻力特性随We 数的变化规律主要分为3个阶段：波动阶段、阶跃阶段和平滑阶段，并会受到低温环境的影响；同一We 数的水滴变形率、阻力系数会呈现出随着温度的降低而降低的趋势；温度对处于波动阶段的过冷水滴影响最大，随后在阶跃和平滑阶段，温度对水滴动力学行为的影响逐渐减小。