Abstract
Characteristics and spatial structure of premixed low-Lewis-number flames in stretched flow of two slot burners are studied numerically and theoretically in the frame of thermo-diffusive model with one-step chemical reaction. Three different combustion regimes are distinguished: twin planar flames, twin wrinkled flames and multiple flame tubes. In the multiple flame tube case the continuous flame front surface does not exist and combustion wave is represented by the set of separate reacting spots of tube-like form. The regions of existence of different combustion regimes in fuel concentration / stretch rate plane were determined. It was found that continuous flames (i.e. wrinkled and planar twin flames) exist inside the C-shape extinction limit curve obtained in the frame of one-dimensional model, while flame tubes appear beyond this limit in the entire range of stretch rates. Investigations of Lewis number effect allow to conclude that 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. Similarities and differences in regime diagrams and spatial flame structure of stretched premixed flames in conventional axisymmetric configuration and in slot-jet arrangement are discussed. Besides that, theoretical and numerical results are compared with experimental data available in a literature.
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