Effects of downstream ramp on the fuel diffusion of single cross jet at supersonic flow: Computational study

•Effect of downstream ramp on the mixing of cross jet at supersonic flow is studied.•The mixing performance of the air/fuel jets in various injector types is investigated.•Angle effect of downstream ramp on mixing performance is fully investigated.•CFD approach is applied for the simulation of the cross jet with downstream ramp.•The fuel mixing of the lobe injector is more efficient than rectangular and circular nozzle.