Design and consideration of active and passive combined thermal protection system of Scramjet

For the predicament in thermal protection technology of the Scramjet, a new active and passive combined thermal protection technology which uses the coolant and passive materials to bear the thermal load is put forward. Based on this technology, it is hopeful to achieve the development of high Mach and break through the thermal barrier limiting. And then design connotation and overall design principles are analyzed. Meanwhile, the relationships among the heat load shared by the passive construction, thermal conductivity and thickness of passive materials are discussed. The C/SiC is selected as the passive material to analyze the technology advantages of the active and passive combined thermal protection technology. When the thickness of C/SiC is 4 mm, the heat flux could be broadly reduced by 42% at Ma=6.5 and equivalence ratio 0.5.