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H2-O2 Porous Fuel Injection in a Radical Farming Scramjet

Capra, Bianca and Lorrain, Philippe and Boyce, Russell R. and Brieschenk, Stefan and Kuhn, Markus and Hald, Hermann (2012) H2-O2 Porous Fuel Injection in a Radical Farming Scramjet. 18th AIAA International Space Planes and Hypersonic Systems and Technologies Conference, 24.-28. Sept. 2012, Tours, France.

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Abstract

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 40 MPa 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.

Item URL in elib:https://elib.dlr.de/77588/
Document Type:Conference or Workshop Item (Speech)
Additional Information:AIAA-2012-5814
Title:H2-O2 Porous Fuel Injection in a Radical Farming Scramjet
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Capra, BiancaCenter for Hypersonics, University of Queensland, AUSUNSPECIFIED
Lorrain, PhilippeCenter for Hypersonics, University of Queensland, AUSUNSPECIFIED
Boyce, Russell R.Center for Hypersonics, University of Queensland, AUSUNSPECIFIED
Brieschenk, StefanCenter for Hypersonics, University of Queensland, AUSUNSPECIFIED
Kuhn, Markusmarkus.kuhn (at) dlr.deUNSPECIFIED
Hald, Hermannhermann.hald (at) dlr.deUNSPECIFIED
Date:24 September 2012
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:CMC, Ceramic Matrix Composites, Oxygen Enrichment, Porous Fuel Injection, Radical Farming Scramjet
Event Title:18th AIAA International Space Planes and Hypersonic Systems and Technologies Conference
Event Location:Tours, France
Event Type:international Conference
Event Dates:24.-28. Sept. 2012
Organizer:American Institute of Aeronautics and Astronautics
HGF - Research field:Aeronautics, Space and Transport, Aeronautics, Space and Transport
HGF - Program:Space, Aeronautics
HGF - Program Themes:Space Transport, Propulsion Systems (old)
DLR - Research area:Raumfahrt, Aeronautics
DLR - Program:R RP - Raumtransport, L ER - Engine Research
DLR - Research theme (Project):R - Antriebsystemtechnik - Schubkammertechnologie, L - Combustion Chamber Technologies (old)
Location: Stuttgart
Institutes and Institutions:Institute of Structures and Design > Space Structural Components
Deposited By: Kuhn, Markus
Deposited On:15 Oct 2012 09:41
Last Modified:15 Oct 2012 09:41

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