Abstract The thermal load on a lobed scramjet (supersonic combustion ramjet) strut injector is investigated numerically for Mach 8 flight conditions. For this purpose, coupled 3D RANS (Reynolds Averaged Navier-Stokes) simulations of the supersonic external flow field around the strut injector and the subsonic strut internal hydrogen flow are performed. The temperature distribution in the solid strut material is simulated by a separate code, which exchanges data with the fluid solvers. Due to the predominantly low Mach numbers inside the strut, an all-Mach number preconditioning is required to enable convergence of the compressible flow solver. The air flow Mach number in the combustion chamber is three. Different strut materials (copper, silicone carbide, molybdenum, and tungsten) with different heat capacities and thermal conductivities are compared. Moreover, the impact of the height of the blunt tip of the strut on the heat load is investigated. Due to a small detached normal shock wave upstream of the strut, the temperatures at the tip become very high; this part is notably difficult to cool. In order to keep the strut temperatures acceptable, it is cooled actively by the hydrogen that is injected for combustion. A sophisticated internal strut structure is needed to direct the hydrogen towards regions of highest heat load. Different strut geometries, fuel mass fluxes (equivalence ratios), and strut materials are investigated.
Highlights First comprehensive numerical study of heat transfer for scramjet strut injector. Demonstration that the lobed strut injector concept works well at Mach 8. Important modifications for strut injectors identified for further improvements. Temperature ranges for di_erent strut materials and hydrogen mass flow rates given. Recommendations for strut injector optimization given.
Numerical investigation of scramjet strut injector cooling for different fuel mass fluxes and strut material properties at mach 8 flight conditions
Acta Astronautica ; 160 ; 353-364
2019-04-20
12 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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