NEAR-LIMIT FLAME STRUCTURES AT LOW LEWIS NUMBER

被引:142
作者
RONNEY, PD
机构
[1] Department of Mechanical and Aerospace Engineering, Princeton University, Princeton
关键词
D O I
10.1016/0010-2180(90)90074-2
中图分类号
O414.1 [热力学];
学科分类号
摘要
The characteristics of premixed gas flames in mixtures with low Lewis numbers near flammability limits were studied experimentally using a low-gravity environment to reduce buoyant convection. The behavior of such flames was found to be dominated by diffusive-thermal instabilities. For sufficiently reactive mixtures, cellular structures resulting from these instabilities were observed and found to spawn new cells in regular patterns. For less reactive mixtures, cells formed shortly after ignition but did not spawn new cells; instead these cells evolved into a flame structure composed of stationary, apparently stable spherical flamelets. Experimental observations are found to be in qualitative agreement with elementary analytical models based on the interaction of heat release due to chemical reaction, differential diffusion of thermal energy and mass, flame front curvature, and volumetric heat losses due to gas and/or soot radiation. © 1990.
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页码:1 / 14
页数:14
相关论文
共 35 条
[1]   DETERMINATION OF BURNING VELOCITIES - CRITICAL REVIEW [J].
ANDREWS, GE ;
BRADLEY, D .
COMBUSTION AND FLAME, 1972, 18 (01) :133-&
[2]   NEAR-LIMIT DOWNWARD PROPAGATION OF HYDROGEN AND METHANE FLAMES IN OXYGEN-NITROGEN MIXTURES [J].
BREGEON, B ;
GORDON, AS ;
WILLIAMS, FA .
COMBUSTION AND FLAME, 1978, 33 (01) :33-45
[3]   QUENCHING OF DEFLAGRATION WAVES [J].
BUCKMASTER, J .
COMBUSTION AND FLAME, 1976, 26 (02) :151-162
[4]  
BUCKMASTER J, 1984, COMBUST SCI TECHNOL, V35, P287
[5]  
BUCKMASTER J, IN PRESS COMBUST FLA
[6]   SPHERICAL FLAME INITIATION - THEORY VERSUS EXPERIMENTS FOR LEAN PROPANE-AIR MIXTURES [J].
CHAMPION, M ;
DESHAIES, B ;
JOULIN, G ;
KINOSHITA, K .
COMBUSTION AND FLAME, 1986, 65 (03) :319-337
[7]   DYNAMIC BEHAVIOR OF PREMIXED FLAME FRONTS IN LAMINAR AND TURBULENT FLOWS [J].
CLAVIN, P .
PROGRESS IN ENERGY AND COMBUSTION SCIENCE, 1985, 11 (01) :1-59
[8]  
Coward H. F., 1952, BULLETIN, V503, P168
[9]   ON THE INITIATION OF A SPHERICAL FLAME KERNEL [J].
DESHAIES, B ;
JOULIN, G .
COMBUSTION SCIENCE AND TECHNOLOGY, 1984, 37 (3-4) :99-116
[10]  
Ishizuka S., 1982, 19 S INT COMB, P327