Reaction-sheet regime premixed

The problem to which these methods are applied here is one of turbulent combustion in the reaction-sheet regime. It is known that turbulent reacting flows exhibit different regimes of turbulent combustion, as illustrated in Fig. 25.1. The diagram shown applies to both premixed flames... 

For burning in a reactive atmosphere, conditions may be encountered for which the analysis of the diffusion-flame regime is relevant. Under suitable conditions there are two thin reaction sheets, an inner one at which premixed decomposition of the monopropellant occurs and an outer one having a diffusion-flame character. Categorizations are available for potential limiting behaviors at large Damkohler numbers in reactive environments [206]. There are many flame-structure possibilities, not all of which have been analyzed thoroughly. 

As the premixed-flame temperature decreases, conditions may be calculated for which the second reactant also begins to leak through the reaction zone in appreciable quantities. An asymptotic analysis may be developed for which, in the reaction zone, the factor tp — tf remains effectively constant [184], Departures from equations (82), (83), and (84) then occur even in lowest order on both sides of the flame sheet. This regime has been termed the partial-burning regime [184]. 

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