Numerical Analysis of the Reaction Process in a Plane Shear Layer

The unsteady reaction process in an incompressible plane shear layer was numerically simulated by using the discrete vortex method combined with the third-order upwind finite difference method. The average product concentration increased and the thickness of the reaction zone decreased as the Damkohler number increased. The distribution profiles of the average concentrations and the fluctuation intensities showed similarities. The two-dimensional large eddy motion produced the stepwise shape of the average concentrations and the two-peak profiles of the fluctuation intensities. The asymmetrical entrainment of the highspeed fluid in a plane shear layer resulted in variations in the reaction rate and in the product thickness, as the stoichiometric ratio was changed.