Hydrogen mixing behind strut inside scramjet engine with an annular diamond nozzle

This study employs computational fluid dynamics to investigate fuel mixing behavior behind a strut equipped with a diamond injector in a supersonic combustion chamber. Three distinct diamond injector configurations are analyzed in a three-dimensional model of the strut under a free-stream Mach number of 2.2. The hydrogen distribution and flow structures associated with these configurations are comprehensively examined to identify the most effective mechanism for fuel mixing within the combustor. Additionally, the circulation strength and flow patterns are evaluated to compare the flow variations influenced by the injector shapes. The numerical simulation results indicate that the diamond injector with an expansive distribution achieves a higher efficiency in fuel mixing, despite exhibiting a lower circulation strength. The findings reveal that circulation formation within the jet core significantly enhances fuel mixing compared to the side vortices.