Effect of sinusoidal splitter on mixing performance of co-flow jets of hydrogen and air inside dual-combustor ramjet

Abstract

In this study, the existence of a sinusoidal splitter on the formation and distribution of hydrogen and air co-jets are investigated in a dual-combustion ramjet engine. The main scope of this research is to analyze the comprehensive flow structure and flame features directly downstream of the sinusoidal splitter. In this work, shockwave/shear-layer interactions behind the sinusoidal splitter are thoroughly studied through a computational fluid dynamic approach. Two different splitter profiles are compared with a simple splitter to demonstrate the main effects of multi shock wave interactions on fuel distribution and penetrations. To simulate co-air jet, Reynolds Average Navier-Stocks equations with SST turbulence model are considered as the main governing equations. Numerous mechanisms uttering the flame anchoring and diffusion effects are investigated. It is found that expansion and compression waves due to the presence of sinusoidal waves play the main role in local mixing and combustion of fuel (hydrogen) in a confined domain. Our results indicate that the existence of a low amplitude splitter produces multi expansion waves that augment the formation of vortices. As the strength of these waves becomes non-uniform, they decline each other and this weakens the strength of vortices.