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为进一步揭示气体介质中液滴破碎的机理与影响因素,采用LES与VOF相结合的方法对液滴破碎过程进行了数值模拟,计算结果与实验结果符合较好,并且优于前人RANS模拟的计算结果。在此基础上,对多工况液滴破碎进行了LES/VOF模拟,分析计算结果发现,液滴破碎初期,液滴的尾涡效应影响液滴的初始变形位置,在变形过程中,液滴表面压力分布直接影响液滴的破碎状态;另外,在一定初始速度范围内,液滴破碎过程保持一致,但初始速度对液滴变形破碎时间及强度影响明显。
In order to further reveal the mechanism and influencing factors of liquid droplet breakage in gas medium, the droplet breakup process is simulated by LES and VOF. The calculated results are in good agreement with the experimental results and better than the previous RANS simulation Calculation results. On the basis of this, the LES / VOF simulation of liquid droplet breakage in multi-working condition was carried out. The results of calculation and calculation showed that the wake vortex effect of liquid droplet affected the initial deformation position of droplet in the early stage of liquid droplet breakage. During the deformation, The surface pressure distribution directly affects the broken state of the droplet. In addition, the droplet breakup process is consistent within a certain initial speed range, but the initial velocity has a significant effect on the droplet breakup time and strength.