| 燃烧油滴内部蒸发的气泡周期性暴涨/碎裂 |
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| 引用本文： | 陆奇志,龚景松,朴英,殷雅俊,李辉,范红雨.燃烧油滴内部蒸发的气泡周期性暴涨/碎裂[J].航空动力学报,2017,32(8):1869-1875. |
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| 作者姓名： | 陆奇志 龚景松 朴英 殷雅俊 李辉 范红雨 |
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| 作者单位： | 清华大学 航天航空学院,北京 100084 |
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| 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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| 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。
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| 关 键 词： | 挂滴 燃烧 内部蒸发 微气泡 暴涨和碎裂 |
| 收稿时间： | 2017/3/8 0:00:00 |
Periodic expansion/fracture of bubbles in burning oil droplets by internal evaporation |
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| LU Qizhi,GONG Jingsong,PIAO Ying,YIN Yajun,LI Hui,FAN Hongyu.Periodic expansion/fracture of bubbles in burning oil droplets by internal evaporation[J].Journal of Aerospace Power,2017,32(8):1869-1875. |
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| Authors: | LU Qizhi GONG Jingsong PIAO Ying YIN Yajun LI Hui FAN Hongyu |
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| Abstract: | The following phenomena were captured in combustion process by highspeed 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 1.25 mm diameter droplet at environment temperature of 973 K.Namely:(1) in 0.04 s,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 comhustion. |
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| Keywords: | suspended droplet combustion internal evaporation micro bubbles expansion and fracture |
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