Numerical modeling of the effect of fuel injection on the structure of a bounded near wake

Bounded axisymmetric flow in the region behind the cylindrical end of a body past which air flows supersonically is analyzed numerically in the case where fuel is injected into the base of the near wake. The problem involves solving a system of equations describing the unsteady laminar flow of an N-component reactive gas mixture. A five-component (model) chemical system in which two reactions occur is analyzed. The energetics and kinetic parameters of the reactions provide a rough description of the combustion kinetics of hydrogen in air. The coefficients of effective diffusion, which depend in a complex way on the composition and the coefficients of binary diffusion of all the vapors of the mixture's components, are approximated by simple expressions and are calculated in such a way as to obviate the difficulties (Rivard, 1977) associated with a correct description of mass transfer given vastly different coefficients of effective diffusion.