Abstract
Characteristics and spatial structure of premixed low-Lewis-number flames in stretched flow of two slot burners were investigated numerically and theoretically using thermo-diffusive model with one-step chemical reaction. Three different combustion regimes were distinguished twin planar flames twin wrinkled flames and multiple flame tubes. in the latter case no continuous flame front surface was observed and combustion wave was represented by the set of separate reacting spots of tube-like form. Continuous flames e.g. wrinkled and planar twin flames appeared inside the C-shape extinction limit curve obtained in the frame of one-dimensional model while flame tubes appeared beyond this limit in the entire range of stretch rates. The extension of low-Lewis-number counterflow flame flammability limits is related with the possibility of formation of non-planar flame tube structure caused by the effect of diffusive-thermal instability.
| Original language | English |
|---|---|
| Pages (from-to) | 1613-1620 |
| Number of pages | 8 |
| Journal | Proceedings of the Combustion Institute |
| Volume | 36 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 2017 |
Keywords
- Diffusive-thermal instability
- Flame tubes
- Heat losses
- Premixed cellular flames
- Slot-jet counterflow burners
ASJC Scopus subject areas
- Chemical Engineering(all)
- Mechanical Engineering
- Physical and Theoretical Chemistry