Effects of the strut injector location on an axisymmetric scramjet combustor performance using hydrocarbon fuel - A CFD study

Miranda, C and Thakor, N and Devaraj, MKK and Jagadeesh, G (2018) Effects of the strut injector location on an axisymmetric scramjet combustor performance using hydrocarbon fuel - A CFD study. In: 22nd AIAA International Space Planes and Hypersonics Systems and Technologies Conference, 2018, 17 - 19 September 2018, Orlando.

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Abstract

In this study, an axisymmetric scramjet combustor with a strut injector configuration is employed to observe and report the effects of a single strut fuel injector on the performance of the combustor, by varying the location of the fuel injector. The residence time of flow within a typical scramjet combustor is of the order of milliseconds due to the flow being supersonic, within this time period, fuel has to mix with the oxidizer and burn, thus a high mixing efficiency and combustion efficiency are required, which is influenced by the injector location. A single step ethylene chemistry reaction mechanism is used to simulate the combustion process inside the combustor. A framework is established within MatLab to automate the geometry creation, grid generation, CFD solving, and post processing of a generic scramjet combustor. Using this framework multiple geometires are created and simulation is carried out. It is observed that some configurations lead to the formation of a shock train upstream of the strut injectors which in turn resulted in subsonic flow within the combustor, this causes the combustor to operate in ram mode, while other configurations cause the combustor to operate in scram mode. Thus on varying the strut location, the mode of operation of the combustor can switch between ram mode and scram mode.

Item Type:	Conference Paper
Publication:	22nd AIAA International Space Planes and Hypersonics Systems and Technologies Conference
Publisher:	American Institute of Aeronautics and Astronautics Inc, AIAA
Additional Information:	The copyright for this article belongs to the American Institute of Aeronautics and Astronautics Inc, AIAA.
Keywords:	Combustion; Computational fluid dynamics; Efficiency; Ethylene; Fuel injection; Fuels; Hydrocarbon refining; Location; MATLAB; Ramjet engines; Struts, Combustion efficiencies; Combustion pro-cess; Hydrocarbon fuel; Mixing efficiency; Mode of operations; Post processing; Reaction mechanism; Scramjet combustors, Combustors
Department/Centre:	Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering)
Date Deposited:	19 Aug 2022 05:35
Last Modified:	19 Aug 2022 05:35
URI:	https://eprints.iisc.ac.in/id/eprint/75991

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