Near-lean limit combustion regimes of low-Lewis-number stretched premixed flames

作者：Fursenko Roman^*; Minaev Sergey; Nakamura Hisashi; Tezuka Takuya; Hasegawa Susumu; Kobayashi Tomoya; Takase Koichi; Katsuta Masato; Kikuchi Masao; Maruta Kaoru

来源：Combustion and Flame, 2015, 162(5): 1712-1718.

DOI：10.1016/j.combustflame.2014.11.032

• Counterflow premixed flames
• Cellular flames
• Heat loss
• Flame ball
• Diffusive-thermal instability

Dynamic behavior and 3D spatial structure of low-Lewis-number counterflow premixed flames are numerically studied in the frame of thermo-diffusive model with one-step chemical reaction. The diverse combustion regimes are described and regions of existence of these regimes in equivalence ratio/stretch rate plane are identified. Qualitative comparison between numerical results and results of microgravity experiments are discussed. Experiments and numerical simulations demonstrate that at small stretch rate conditions lean low-Lewis-number counterflow flames can appear as a set of separate ball-like flames in a state of chaotic motion. The extension of extinction limits associated with existence of sporadic combustion regimes is observed.

• 出版日期2015-5