论文部分内容阅读
为了获得热气流中单液滴剪切破碎特性,采用高速摄像机对液滴变形、破碎过程进行了捕获。结果表明:液滴初始直径减小、气流温度增加,降低了液滴发生剪切破碎所需最小气动力;液滴破碎特征时间,随气动力增加呈线性递减变化趋势,且其值与变化梯度都随液滴初始直径增加而增大;液滴破碎区域面积、子液滴质量百分数随气动力增加呈先增加后减小的变化趋势,液滴初始直径增加,液滴破碎区域面积随之增加,而子液滴质量百分数则随之减小;剪切破碎锥角,随气动力增加呈线性减小的变化趋势;液滴破碎程度随液滴初始直径增加有明显改善;标准离差率数学模型可以用于子液滴群空间分布均匀性方面的研究。
In order to obtain the shear and crushing characteristics of a single droplet in a hot gas stream, a high-speed camera is used to capture the deformation and the crushing of the droplet. The results show that the initial diameter of the droplet decreases and the temperature of the gas flow increases, which reduces the minimum aerodynamic force required for shear breaking of the droplet. The characteristic time of droplet breakup decreases linearly with increasing aerodynamic force, The area of droplet disintegration area and the mass percent of sub-droplet increase first and then decrease with the increasing of aerodynamic force, the initial diameter of droplet increases and the area of droplet disintegration area increases accordingly , While the percentage of sub-droplet mass decreases. The shear cone angle decreases linearly with the increase of aerodynamic force. The degree of droplet breakup is obviously improved with the droplet initial diameter. The standard deviation rate The model can be used to study the spatial distribution uniformity of subdrops.