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. The microscopic bubble nucleation, growth, aggregation and spillage were observed and the phenomena of droplet beating were observed by high-speed microscopy. The results showed that: 1 droplet The location at which microbubbles are generated; 2 the expansion of the volume of droplets caused by the microbubbles at the initial stage of evaporation; 3 the beating of droplets by the action of bubbles during combustion; and 4 the steady (no-burst) phenomenon of the droplet combustion. The effect of surface tension on the combustion of the droplet was analyzed. The critical characteristic volume under the critical condition of the droplet combustion was determined at 2.5 ~ 5.0μL.