Relight imaging at low temperature, low pressure conditions

Robert Read, J.W. Rogerson, S. Hochgreb

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review


High-altitude relight inside a lean, direct-injection, gas turbine combustor is investigated experimentally by high-speed imaging. Ignition testing is conducted at two operating conditions: a 'safe' point at which relight is possible, and an 'unsafe' condition where ignition is precluded by the large air mass flow rate. Image processing software has been developed to analyze the motion and breakup of the imaged flame. At the safe condition, the developing flame kernels are typically swept downstream and towards the fuel-injector center-line, before moving upstream. The comparatively large gas-phase velocity at the unsafe condition causes rapid disintegration of the ignition kernel. At neither condition does the size of the spark kernel determine ignition outcome. Good agreement is demonstrated between the measured spark-centroid velocity and CFD predictions of gas-phase velocity below the igniter tip.
Original languageEnglish
Title of host publication46. AIAA Aerospace Sciences Meeting and Exhibit
PublisherAmerican Institute of Aeronautics and Astronautics
Publication date2008
ISBN (Print)9781563479373
Publication statusPublished - 2008
Externally publishedYes
Event46th AIAA Aerospace Sciences Meeting and Exhibit - Reno, NV, United States
Duration: 7 Jan 200810 Jan 2008
Conference number: 46


Conference46th AIAA Aerospace Sciences Meeting and Exhibit
Country/TerritoryUnited States
CityReno, NV


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