Abstract In this study a flush wall scramjet combustor is tested in a supersonic incoming air flow with the Mach number of 3 which is generated by an air vitiation heater producing the stagnation temperature of 1505K. Using liquid kerosene as the fuel, the flame is stabilized by means of a centrally mounted O2 pilot strut after being ignited by a plasma torch. During experimental measurements, the fuel is injected with a constant equivalence ratio of 0.8 according to specified strut/wall injection ratios, i.e., a portion of the fuel amount is injected from the strut while the rest is injected from the wall. The strut and wall injectors are arranged at the same axial position. The combustion performance and wall temperature gradients are evaluated with various fuel feeding ratios between the wall and the strut. Experimental results show, when the equivalence ratio is constant and the axial injection position is fixed, the combustion characteristics vary significantly with the strut/wall fuel feeding ratio, especially when this ratio is close to its lowest and highest limits. Among the four fuel feeding ratios examined, the strut only injection mode and the average distributed strut/wall injection mode show the best combustion performance. However, the strut/wall injection mode produces a smaller wall temperature gradient compared to the strut only injection mode, which is due to the significant film cooling effect caused by the wall injected liquid kerosene.
Highlights Flush wall scramjet combustor using strut/wall liquid kerosene injection. Constant φ, different fuel distribution of the strut/wall. Combustion performance highly depended on the distribution of the strut/wall. Strut only and averaged distribution of the strut/wall show the best combustion performance. Lower wall heat load for the strut/wall injection due to the film cooling effect.
Experimental study of a flush wall scramjet combustor equipped with strut/wall fuel injection
Acta Astronautica ; 104 , 1 ; 84-90
2014-07-10
7 pages
Article (Journal)
Electronic Resource
English
Experimental study of a flush wall scramjet combustor equipped with strut/wall fuel injection
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