A detailed investigation of nominally 2-D radical-farming scramjet combustion

Lorrain, Philippe, Brieschenk, Stefan, Capra, Bianca R., & Boyce, Russell R. (2012) A detailed investigation of nominally 2-D radical-farming scramjet combustion. 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 an investigation of the flow/chemistry coupling inside a nominally two-dimensional inlet-fuelled scramjet configuration. The experiments were conducted at a freestream Mach number of 7.3 and a total flow enthalpy of 4.3MJ/kg corresponding to a Mach 9.7 flight condition. The phenomenon of radical-farming has been studied in detail using two-dimensional OH* chemiluminescence imaging and emission spectroscopy. High signal levels of excited OH (OH*) were detected behind the first shock reflections inside the combustion chamber upstream of any measurable pressure rise from combustion, which occurred towards the rear of the combustor. The production of OH in the first hot pocket initiates the ignition process and then accelerates the combustion process in the next downstream hot pocket. This was confirmed by numerical simulations of premixed hydrogen/air flow through the scramjet. Chemical kinetics analyses reveal that the ignition process is governed by the interaction between various reaction groups leading to a chainbranching explosion for low mean temperature and pressure combustion flowfields.

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ID Code: 70318
Item Type: Conference Paper
Refereed: No
Additional URLs:
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2012 Please consult the authors
Deposited On: 22 Apr 2014 02:29
Last Modified: 30 Apr 2014 23:37

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