Influences of swirl on the structure and extinction of strained premixed flames. Part II: Strong rates of rotation

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Abstract
The characteristics of isenthalpic planar premixed flames in counterflowing streams involving high Reynolds numbers and either corotating or counter-rotating swirl of large magnitudes are analyzed. The method of activation energy asymptotics is applied to a one-step Arrhenius reaction with small departures from unity Lewis numbers. Density changes resulting from heat release are fully taken into account. High swirl is shown to lead to three stagnation points and regions of radial inflow in agreement with experiment. It is shown that the character of the viscous regions containing the flames and their extinction behavior are significantly influenced by swirl for strong rates of rotation. The present analysis shows that the resonances found in an earlier inviscid calculation are not physically realizable and accounts for the reversal of the lean flammability limit with rotation rate found experimentally.

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