H2-O2 porous fuel injection in a radical farming scramjet

Capra, Bianca R., Lorrain, Philippee, Boyce, Russell R., Brieschenk, Stefan, Kuhn, Markus, & Hald, Hermann (2012) H2-O2 porous fuel injection in a radical farming scramjet. In 18th AIAA/3AF International Space Planes and Hypersonic Systems and Technologies Conference, 24-28 September 2012, Vinci International Congress Centre of Tours, Tours, France.

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This paper reports on the experimental testing of oxygen compatible ceramic matrix composite porous injectors in a nominally two-dimensional hydrogen fuelled and oxygen enriched radical farming scramjet in the T4 shock tunnel facility. All experiments were performed at a dynamic pressure of 146 kPa, an equivalent flight Mach number of 9.7, a stagnation pressure and enthalpy of 40MPa and 4.3 MJ/kg respectively and at a fuelling condition that resulted in an average equivalence ratio of 0.472. Oxygen was pre-mixed with the fuel prior to injection to achieve enrichment percentages of approximately 13%, 15% and 17%. These levels ensured that the hydrogen-oxidiser mix injected into the engine always remained too fuel rich to sustain a flame without any additional mixing with the captured air. Addition of pre-mixed oxygen with the fuel was found to significantly alter the performance of the engine; enhancing both combustion and ignition and converting a previously observed limited combustion condition into one with sustained and noticeable combustion induced pressure rise. Increases in the enrichment percentage lead to further increases in combustion levels and acted to reduce ignition lengths within the engine. Suppressed combustion runs, where a nitrogen test gas was used, confirmed that the pressure rise observed in these experiments as attributed to the oxygen enrichment and not associated with the increased mass injected.

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ID Code: 70317
Item Type: Conference Paper
Refereed: No
Additional URLs:
Divisions: Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2012 Please consult the authors
Deposited On: 22 Apr 2014 01:59
Last Modified: 21 Jun 2017 00:02

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