Effects of the Lewis Number on Premixed Flame Shape Formation in Narrow Channel
Propagation of unsteady premixed flames in narrow channel with adiabatic wall is numerically investigated, and effects of Lewis number on flame shape formation are discussed particularly. Navier-Stokes equations are solved using finite volume formation. The continuity equation and pressure are solved using the SIMPLE algorithm. It is assumed that the flame chemistry is modeled by one-step overall reaction which simulates the reaction of stoichiometric acetylene-air mixture. The numerical results show that, mushroom-shaped flame is the preferred shape as Lewis number is greater than or equal to unity, while tulip-shaped flame is the preferred shape as Lewis number is less than unity. It is also shown that the enhancement of mass diffusion contributes to the formation of tulip-shaped flame. The drawn conclusion will be a necessary complement to the mechanisms of tulip-shaped flame formation.
narrow channel Lewis number tulip-shaped flame mushroom-shaped flame mass diffusion
SONG Zhanbing YU Jianliang DUO Yingquan LUO Aimin WEI Lijun WU Zongzhi
Institute of Hazards Chemical Safety,China Academy of Safety Science and Technology,Beijing 100029,C Institute of Chemical Engineering,Dalian University of Technology,Dalian 116012,Liaoning,China
国际会议
The 2008 International Symposium on Safety Science and Technology(2008年安全科学技术国际会议)
北京
英文
1283-1288
2008-09-24（万方平台首次上网日期，不代表论文的发表时间）