Flame structure and flame reaction kinetics IX. Calculation of properties of multi-radical premixed flamest

Abstract

A ‘composite flux’ method is described whereby the solution of multiradical, one dimensional, premixed laminar flame problems may be simplified by the use of appropriate partial equilibrium or quasi-steady state assumptions. In the solution of the problem by integration of the stationary flame equations, the use of these assumptions fulfils two purposes. First, by providing additional relations between the species mole fractions, it reduces the number of independent working hot boundary conditions which must be matched at the start of a successful integration through the flame, thus making the problem more tractable. Secondly, if the composite fluxes are defined appropriately, reduction of integration step size due to ‘stiffness’ problems associated with certain of the reaction steps may be avoided.