摘要
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 reveal the mechanism of the drop breakup and the factors that affect the breakup, the LES turbulence model and VOF method were combined to simulate the deformation and breakup of liquid droplet in air flow. The calculation results were in good agreement with the experiments and better than the previous calculation results using RANS method. On this basis, the deformation and breakup of liquid droplet were simulated by LES/VOF method under several initial conditions. Simulation results show that the particle wave effect, the initial conditions and the droplet surface pressure play catalytic roles in deformation and breakup of liquid droplet.
出处
《航空计算技术》
2012年第6期58-61,共4页
Aeronautical Computing Technique
关键词
LES
VOF方法
液滴变形
液滴破碎
数值模拟
LES/VOF method
droplet deformation
droplet breakup
numerical simulation
