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利用高速显微摄像技术捕捉到航空煤油RP-3挂滴的燃烧现象——微气泡周期性暴涨/破碎现象。环境温度为973K时,在直径为1.25mm的燃烧油滴内,捕捉到了微气泡的急剧暴涨和瞬间碎裂现象。即:(1)在0.04s内,微气泡直径增长41.6%;(2)在0.01s内,暴涨的气泡在油滴内破碎,激发油滴急剧振荡;(3)油滴恢复相对稳定的蒸发燃烧,内部残留的微气泡,启动第2轮暴涨/破碎;(4)经过3轮暴涨/破碎,油滴燃烧殆尽。因而得出:被高温加热的石英丝挂钩在油滴内部诱发的快速蒸发效应,是微气泡周期性暴涨/碎裂的驱动力,而表面张力则是油滴恢复并保持稳定燃烧的约束机制。
The use of high-speed microscopy imaging technology to capture the jet of aviation kerosene RP-3 droplet combustion phenomenon - periodic bubble burst / crushing phenomenon. At an ambient temperature of 973K, a sharp surge of microbubbles and instantaneous fragmentation were captured within the oil droplets of 1.25mm in diameter. Namely: (1) Within 0.04s, the diameter of microbubbles increased by 41.6%; (2) Within 0.01s, the soaring bubbles crushed within the oil droplets and caused the oil droplets to oscillate sharply; (3) The oil droplets recovered relatively stable evaporation Burning, the internal micro-bubbles left, start the second round of soaring / broken; (4) After 3 ups and downs / broken oil droplets burn out. It is concluded that the rapid evaporation induced by the high temperature heated quartz wire hook in the droplet is the driving force for the periodic bubble / fragmentation of the microbubbles, while the surface tension is the constraint mechanism of oil droplet recovery and stable combustion.