Study of the mechanisms of the flame propagation and stabilization in porous media  

作　　者：ZHAO PingHui YE TaoHong JIANG Hai CHEN YiLiang 

机构地区：[1]Department of Thermal Science&Energy Engineering,University of Science&Technology of China,Hefei 230027,China

出　　处：《Science China(Technological Sciences)》2008年第7期871-881,共11页中国科学（技术科学英文版）

基　　金：the National Natural Science Foundation of China (Grant No. 50376060)

摘　　要：The CH4/air premixed gas combustion processes in porous media were numerically studied using the two-temperature reacting fluid model with dispersions and detailed chemical reaction mechanism GRI 3.0. The mechanisms of the propagation and stabilization of submerge flames and surface flames in porous media were illuminated distinctly by considering the magnitude of the terms in the two energy equations, analyzing the sensibility of flame propagation speed to flame location, heat exchange coefficient between gas and solid, thermal conductivity and radiative extinction coefficient of porous media. It was concluded that the propagation mechanism of a submerged flame is similar to that of a free flame with an additional preheat zone and that the surface-flame propagation mechanism in porous media is similar to that of a free flame with heat loss in reaction zone.The CH4/air premixed gas combustion processes in porous media were numerically studied using the two-temperature reacting fluid model with dispersions and detailed chemical reaction mechanism GRI 3.0. The mechanisms of the propagation and stabilization of submerge flames and surface flames in porous media were illuminated distinctly by considering the magnitude of the terms in the two energy equations, analyzing the sensibility of flame propagation speed to flame location, heat exchange coefficient between gas and solid, thermal conductivity and radiative extinction coefficient of porous media. It was concluded that the propagation mechanism of a submerged flame is similar to that of a free flame with an additional preheat zone and that the surface-flame propagation mechanism in porous media is similar to that of a free flame with heat loss in reaction zone.

关 键 词：POROUS media surface FLAME SUBMERGED FLAME FLAME propagation SPEED 

分 类 号：O643.2[理学—物理化学]