Near field behavior of reacting free jets

Abstract

Numerical simulations of a nonreacting circular jet and both nonreacting and reacting elliptical jets have been completed. Linear stability analysis was used to force the jets at their most amplified frequency. Circular jet simulations showed low levels of coherent structure formation and little oxidizer entrainment. The nonreacting elliptical jet exhibited out-of-plane vortex dynamics and subsequently, structure merging primarily contained within the minor axis region. Chemical reaction hindered out-of-plane vortex motion causing the reacting jet to form primarily planar vortex rings. The overall structure and level of vorticity of the jet was reduced as a result of chemical reaction. Hydroxyl radical production was primarily concentrated within the vortex structures, as expected, but iso-surfaces of hydroxyl number density showed a planar ring shape indicating that the structures were, in fact, planar.