材料厚度对火焰向下传播特性的影响
Effects of Fuel Thickness on Downward Flame Spread
查看参考文献13篇
|
文摘
|
在常重力静止空气环境中对厚度连续变化的聚甲基丙烯酸甲酯(PMMA)平板表面火焰向下传播进行实验研究,分析了材料厚度对火焰传播特性的影响.结果表明,材料厚度增加时,火焰长度和材料热解长度单调增加,而当材料厚度减小时,材料热解长度和火焰长度先增加后减小.在这两种情况下,均存在热薄材料和热厚材料的转变厚度,其值与文献中使用均匀厚度材料得到的实验结果及理论预测一致;材料厚度小于该转变厚度时,火焰传播速度与材料厚度呈反比关系,大于该厚度时,火焰传播速度不随材料厚度变化,这分别符合热薄材料和热厚材料火焰传播速度的理论模型. |
|
其他语种文摘
|
Experiments were conducted in a quiescent air environment at normal gravity to investigate downward flame spread over a polymethylmethacrylate (PMMA)sheet whose thickness varies continuously along its length, and the effect of fuel thickness on flame spread was analysed.The experimental results show that,with increasing fuel thickness,both flame length and pyrolysis length increase monotonically,while both parameters increase first and then decrease when the fuel thickness decreases.The transition between thermally-thin and thermallythick fuel regime is found in both cases,and the transition thickness agrees well with both previously published experimental result obtained for uniform fuel samples and theory prediction.For the fuel section whose thickness is smaller than the transition thickness,the flame spread rate is inversely proportional to sample thickness,while for the thicker section the flame spread rate is independent of fuel thickness.The relationships between flame spread rate and fuel thickness revealed by the present experiments agree well with the theoretical models for thermallythin fuel and thermally-thick fuel,respectively. |
|
来源
|
燃烧科学与技术
,2018,24(1):21-26 【核心库】
|
|
DOI
|
10.11715/rskxjs.r201703038
|
|
关键词
|
火焰传播
;
热薄材料
;
热厚材料
;
转变厚度
|
|
地址
|
1.
中国科学院力学研究所, 中国科学院微重力重点实验室, 北京, 100190
2.
中国科学院大学工程科学学院, 北京, 100049
|
|
语种
|
中文 |
|
文献类型
|
研究性论文 |
|
ISSN
|
1006-8740 |
|
学科
|
能源与动力工程 |
|
基金
|
国家自然科学基金资助项目
;
中国科学院空间科学战略性先导科技专项基金资助项目
|
|
文献收藏号
|
CSCD:6200735
|
参考文献 共
13
共1页
|
|
1.
de Ris J N. Spread of a laminar diffusion flame.
Twelfth Symposium (International)on Combustion,1969:241-252
|
被引
1
次
|
|
|
|
|
2.
Fernandez-Pello A C. Laminar flame spread over PMMA surfaces.
Fifteenth Symposium (International)on Combustion,1975:217-231
|
被引
1
次
|
|
|
|
|
3.
Fernandez-Pello A C. Flame spread in an opposed forced flow:The effect of ambient oxygen concentration.
Eighteenth Symposium (International) on Combustion,1981:579-589
|
被引
4
次
|
|
|
|
|
4.
Wichman I S. Flame spread in an opposed flow with a linear velocity gradient.
Combustion and Flame,1983,50:287-304
|
被引
3
次
|
|
|
|
|
5.
Bhattacharjee S. Determination of the spread rate in opposed-flow flame spread over thick solid fuels in the thermal regime.
Twenty-Sixth Symposium (International)on Combustion,1996:1477-1485
|
被引
1
次
|
|
|
|
|
6.
Bhattacharjee S. Downward flame spread over poly(methyl)methacrylate.
Twenty-Eighth Symposium (International)on Combustion,2000:2891-2897
|
被引
1
次
|
|
|
|
|
7.
Quintiere J.
Fundamentals of Fire Phenomena,2006
|
被引
5
次
|
|
|
|
|
8.
T'ien J S. Mechanisms of flame spread and smolder wave propagation.
Microgravity Combustion:Fire in Free Fall,2001:299-418
|
被引
5
次
|
|
|
|
|
9.
张夏. 热薄材料表面火焰传播的三维效应.
燃烧科学与技术,2010,16(2):137-142
|
被引
2
次
|
|
|
|
|
10.
Zhang Xia. Experimental studies on the threedimensional effects of opposed-flow flame spread over thin solid materials.
Combustion and Flame,2011,158:1193-1200
|
被引
7
次
|
|
|
|
|
11.
Bhattacharjee S. Opposed-flow flame spread:A comparison of microgravity and normal gravity experiments to establish the thermal regime.
Fire Safety Journal,2016,79:111-118
|
被引
4
次
|
|
|
|
|
12.
Jomaas G. Fire safety in space-beyond flammability testing of small samples.
Acta Astronautica,2015,109:208-216
|
被引
3
次
|
|
|
|
|
13.
Ayani M B. Downward flame spread over PMMA sheets in quiescent air: Experimental and theoretical studies.
Fire Safety Journal,2006,41:164-169
|
被引
6
次
|
|
|
|
|
了解气象卫星更多信息，请访问