A simulation study on the amplification of cavity induced air-fuel mixing in scramjet engine

Abstract

The search for technical solutions to optimize the combustion chamber size as well as improve the combustion efficiency of the scramjet engine has gained many benefits from optimizing the air-fuel supersonic mixing. Indeed, the technique of increasing the mixture through optimizing the flow of air-fuel mixture by applying cavity technology is the outstanding solution. This present work reports of a passive enhancement technique of supersonic mixing of air-fuel through amplification of cavity-induced flow field oscillations. In this study, with the controlling-edge profile changes to assess the changing properties of an unstable flow on a shallow cavity at the controlling-edge. This controlling-edge modification is used to augment the stimulating way in a shear surface, and that may lead to the amplification of cavity-induced flow field oscillations. The 'reactingFoam' solver within the OpenFOAM was used to simulate the supersonic cavity induced air-fuel mixing. The pressure changes over time with time and mixing indices at various positions of cavity are analyzed. Changing the leading-edge profile of the combustion chamber has an important impact on the pressure variation as well as the efficiency of the mixing process.