Effect of Pre-combustion Shock Train on Fuel Injection and Distribution in Scramjet

摘要

Effect of pre-combustion shock train on fuel injection and distribution in scramjet wasexperimentally investigated. Experiments were performed with an isolator entrance Mach number of 2.5 andair stagnation temperature of 1200K. High speed camera and schlieren photography were equipped to recordthe dynamic process of liquid fuel injection and shock evolvement. The two kinds of shock structurerespectively pre-combustion shock wave induced by combustion heat release downstream and incident shockwave induced by flow blockage of physical strut were compared and discussed. Results show that the twoproposed methods above can generate the similar shock train structure in shape but differ in their effect offuel injection and evaporation. The former produced by increasing the back-pressure due to heat release hasgreat effect on fuel injection and evaporation. The latter just affect the local behaviour at the position ofinjection.