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A feasible method was developed for cooling of the extreme aerodynamic heating of strut injectors in a scramjet engine. A porous strut injector using transpiration cooling was demonstrated to be effective in a 60 s wind-tunnel test. The Mach number in the wind tunnel was 2.5 with a total temperature of 1774 K. Methane gas was used as the coolant of the transpiration cooling. The structural integrity was retained during the test, with only limited ablation at the top of the strut. Numerical predictions of the bottom surface temperature distribution agreed reasonably well with the measurements. The numerical results showed that the surface temperatures at the leading edge of the strut were dramatically reduced by the transpiration cooling.
Huang et al. (2014) studied this question.