摘要
在微重力和常重力环境中,对不同氧气浓度下柱状聚甲基丙烯酸甲酯(PMMA)表面火焰传播现象进行了实验研究。微重力实验观测了低速强迫对流中的火焰传播,地面实验研究了浮力对流影响下火焰向下传播的规律,分析了氧气浓度与流动对火焰传播的影响。微重力和常重力下的火焰在形态和传播速度上具有显著区别。结合微重力和常重力的实验结果,将火焰传播速度随气流速度的变化关系分为三个区:辐射控制区,传热控制区和化学反应控制区。
Flame spread phenomena over a cylindrical polymethyl methacrylate(PMMA) at different oxygen concentrations have been experimentally studied under microgravity and normal gravity conditions.In microgravity experiments flame spread in low-speed forced flows was observed,and in normal gravity experiments downward flame spread behaviors in buoyancy-induced flows were investigated.The effects of oxygen concentration and flow velocity on flame spread were analyzed.The flame appearance and spread rate show significant differences in microgravity and normal gravity.Combining the results from the two sets of experiments,three distinct regimes are identified to delineate the variation of flame spread rate with gas flow velocity,namely microgravity radiation regime,heat transfer regime and chemical kinetics regime.
作者
吴传嘉
朱凤
王双峰
WU Chuan-Jia;ZHU Feng;WANG Shuang-Feng(Key Laboratory of Microgravity,Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China;School of Engineering Science,University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2019年第11期2672-2677,共6页
Journal of Engineering Thermophysics
基金
国家自然科学基金资助项目(No.U1738117)
中国科学院空间科学战略性先导科技专项资助项目(No.XDA04020410
No.XDA04020202-10)
关键词
火焰传播
柱状固体材料
微重力
浮力对流
flame spread
cylindrical solid fuel
microgravity
buoyant convection
