Combustion enhancement in a scramjet engine using oxygen enrichment and porous fuel injection

Capra, Bianca R., Boyce, Russell R., Kuhn, Markus, & Hald, Hermann (2015) Combustion enhancement in a scramjet engine using oxygen enrichment and porous fuel injection. Journal of Fluid Mechanics, 767, pp. 173-198.

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This paper reports on the experimental testing of oxygen-enriched porous fuel injection in a scramjet engine. Fuel was injected via inlet mounted, oxide-based ceramic matrix composite (CMC) injectors on both flow path surfaces that covered a total of 9.2 % of the intake surface area. All experiments were performed at an enthalpy of 3.93−4.25±3.2% MJ kg−1, flight Mach number 9.2–9.6 and an equivalence ratio of 0.493±3%. At this condition, the engine was shown to be on the verge of achieving appreciable combustion. Oxygen was then added to the fuel prior to injection such that two distinct enrichment levels were achieved. Combustion was found to increase, by as much as 40 % in terms of combustion-induced pressure rise, over the fuel-only case with increasing oxygen enrichment. Further, the onset of combustion was found to move upstream with increasing levels of oxygen enrichment. Thrust, both uninstalled and specific, and specific impulse were found to be improved with oxygen enrichment. Enhanced fuel–air mixing due to the pre-mixing of oxygen with the fuel together with the porous fuel injection are believed to be the main contributors to the observed enhanced performance of the tested engine.

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ID Code: 81830
Item Type: Journal Article
Refereed: Yes
Keywords: combustion, high-speed flow, porous media
DOI: 10.1017/jfm.2015.43
ISSN: 1469-7645
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2015 Cambridge University Press
Deposited On: 16 Feb 2015 23:20
Last Modified: 19 Oct 2015 08:15

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