挂滴燃烧中的微汽泡行为和液滴跳动

利用高速显微摄像技术,观察研究了RP-3微尺度挂滴燃烧过程中,微汽泡的核化、生长、聚并和溢出的行为过程及液滴跳动现象.结果得出:①液滴中微汽泡产生的位置;②在蒸发初期时由微汽泡引起液滴体积的膨胀;③在燃烧中由汽泡行为导致液滴的跳动;④液滴燃烧的稳定(不爆裂)现象.分析了表面张力在挂滴燃烧过程中的作用,确定了挂滴稳定燃烧的临界条件下的临界特征体积在2.5~5.0μL. 

Micro bubble behavior and droplet oscillations in pendant droplet combustion

High-speed microscopic camera technology was applied to observe and research RP-3 micro-scale pendant droplet combustion process, the micro bubble nucleation, growth and coalescence and overflow behavior process and droplet oscillations phenomenon. The results show that:①The location of the micro bubbles generated inside droplet.②The volume expansion of the droplet caused by the micro bubble in incipient evaporation.③The droplet oscillates caused by the bubble behavior in combustion.④The droplets stability combust (not burst) phenomenon. The role of surface tension is analyzed in pendant droplets combustion. It is established that the critical condition of stability combust combustion for pendant droplet, the critical characteristic valume within 2.5-5.0μL.