Chemiluminescence imaging in supersonic combustors operating in radical-farming mode

Brieschenk, Stefan, Lorrain, Philippe, Capra, Bianca R., Boyce, Russell R., McIntyre, Timothy J., Kleine, Harald, & O'Byrne, Sean (2012) Chemiluminescence imaging in supersonic combustors operating in radical-farming mode. 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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Abstract

Emission spectroscopy was used to investigate ignition and combustion characteristics of supersonic combustion ramjet engines. Two-dimensional scramjet models with inlet injection, fuelled with hydrogen gas, were used in the study. The scramjet engines were configured to operate in radical farming mode, where combustion radicals are formed behind shock waves reflected at the walls. The chemiluminescence emission signals were recorded in a two-dimensional, time-integrated fashion to give information on the location and distribution of the radical farms in the combustors. High signal levels were detected in localised regions immediately downstream of shock reflections, an indication of localised hydroxyl formation supporting the concept of radical farming. Results are presented for a symmetric as well as an asymmetric scramjet geometry. These data represent the first successful visualisation of radical farms in the hot pockets of a supersonic combustor. Spectrally resolved measurements have been obtained in the ultraviolet wavelength range between 300 and 400 nm. This data shows that the OH! chemiluminescence signal around 306nm is not the most dominant source of radiation observed in the radical farms.

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ID Code: 70320
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 02:45
Last Modified: 29 Apr 2014 22:49

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