Abstract
The premixed gas flame spreading through an array of large-scale vortices is studied numerically. It is found that the flame speed is a nonmonotonic function of the stirring intensity. At sufficiently low Lewis numbers ( Le < 1 ) the system becomes bistable with a hysteretic transition between possible propagation modes. In the presence of volumetric heat losses the stirring invariably promotes extinction (reduces the flammability limits), provided Le > 1 . At Le < 1 this holds only for sufficiently strong stirring, whereas moderate stirring actually expands the flammability limits. At Le > 1 the deficient reactant is fully consumed up to the very quenching point. At Le < 1 , prior to the total extinction, part of the deficient reactant escapes the reaction zone and remains unconsumed.
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