Chemiluminescence imaging in supersonic combustors operating in radical-farming mode

Stefan Brieschenk, Philippe Lorrain, Bianca R. Capra, Russell R. Boyce, Timothy J. McIntyre, Harald Kleine, Sean O'Byrne

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

7 Citations (Scopus)

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 306 nm is not the most dominant source of radiation observed in the radical farms.

Original languageEnglish
Title of host publication18th AIAA/3AF International Space Planes and Hypersonic Systems and Technologies Conference 2012
PublisherAmerican Institute of Aeronautics and Astronautics Inc.
ISBN (Print)9781600869310
DOIs
Publication statusPublished - 2012
Externally publishedYes
Event18th AIAA/3AF International Space Planes and Hypersonic Systems and Technologies Conference 2012 - Tours, France
Duration: 24 Sept 201228 Sept 2012

Publication series

Name18th AIAA/3AF International Space Planes and Hypersonic Systems and Technologies Conference 2012

Conference

Conference18th AIAA/3AF International Space Planes and Hypersonic Systems and Technologies Conference 2012
Country/TerritoryFrance
CityTours
Period24/09/1228/09/12

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