We investigated the modeling of counterflow diffusion flames in which the products of ammonium perchlorate (AP) combustion were counterflowed against an ethylene fuel stream The two-dimensional problem can be reduced to a one-dimensional boundary value problem along stagnation point stream-line through the introduction of a similarity transformation By utilizing recent developments in hydrocarbon, chlorine, NO x and AP kinetics, we formulated a detailed transport, finite-rate chemistry system for the temperature, velocity, and species mass fractions of the combined flame system A detailed soot model is included which can predict soot volume fractions as a function of the strain rate and the fuel mole fraction We compare the results of this model with a series of experimental measurements in which the temperature was measured with radiatin-corrected thermocouples and OH rotational population distribution: several important species were measured with planar laser-induced fluorescence, UV-visible absorption, and Raman spectroscopies: and the soot volume fraction was measured with laser-induced incandescence and visible absorption spectroscopy

Computational and experimental study of ammonium perchlorate/ethylene counterflow diffusion flames

: A theoretical analysis is presented of the heterogeneous opposed flow diffusion flame (HOFD). In such a system a gaseous reactant (G) impinges on a solid reaction (S) undergoing sublimation (or vaporization) and a diffusion flame is established at the stagnation point. With increasing mass flux of the gaseous reactant (mG) the mass flux of solid reactant (mS) grows until the total consumption rate of reactants reaches a limiting value due to limitations imposed by the kinetics of reaction. The analysis of the axi-symmetrical stagnation point flow with chemical reaction allows evaluation of the kinetics of chemical reaction at temperatures of interest to combustion processes. (Author)

C. M. Ablow

Papers

Solid Propellant Kinetics. II. Theoretical Analysis of the Heterogeneous Opposed Flow Diffusion Flame.