燃烧油滴内部蒸发的气泡周期性暴涨/碎裂

陆奇志; 龚景松; 朴英; 殷雅俊; 李辉; 范红雨

doi:10.13224/j.cnki.jasp.2017.08.011

燃烧油滴内部蒸发的气泡周期性暴涨/碎裂

doi: 10.13224/j.cnki.jasp.2017.08.011

清华大学航天航空学院,北京 100084

基金项目: 国家自然科学基金(51036004,11672150,11272175); 高等学校博士生导师基金（20130002110044）

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出版历程
- 收稿日期: 2017-03-08
- 刊出日期: 2017-08-28

Periodic expansion/fracture of bubbles in burning oil droplets by internal evaporation

摘要

摘要: 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。
- 挂滴 /
- 燃烧 /
- 内部蒸发 /
- 微气泡 /
- 暴涨和碎裂
Abstract: The following phenomena were captured in combustion process by high-speed microscopic camera technology: the periodic expansion/fracture of micro bubbles in aviation kerosene RP-3 suspended droplet. The phenomena that the micro bubbles sharply expanded and suddenly fractured were found inside the burning 1.25mm diameter droplet at environment temperature of 973K. Namely: (1) in 0.04s, the diameter of the micro bubbles increased by 41.6%; (2) in 0.01s, the expansion bubble was fractured inside the droplet, which stimulated the droplet's sharply oscillations; (3) the droplet resumed relatively stable evaporation and combustion，and the internal residuals of the micro bubbles were observed to start the second round of expansion/fracture; (4) the droplet burned away after three rounds of expansion/fracture. The following mechanism was speculated: the quartz fiber heated by high temperature induced the rapid evaporation effect inside the droplet, which was the driving force of the micro bubble periodic expansion/fracture. Moreover, surface tension was the restraint mechanism to restore and maintain the droplet stable combustion.
- suspended droplet /
- combustion /
- internal evaporation /
- micro bubbles /
- expansion and fracture

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