OH Planar Laser-Induced Fluorescence and Emission Imaging in High Pressure LOx/Methane Flames
Autor: | Philippe Scouflaire, Juan Carlos Rolon, Lucien Vingert, Sébastien Candel, G. Singla |
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Přispěvatelé: | Laboratoire d'Énergétique Moléculaire et Macroscopique, Combustion (EM2C), CentraleSupélec-Centre National de la Recherche Scientifique (CNRS)-Université Paris Saclay (COmUE), Snecma, CNES - CNS, Programme INCA, Snecma, CNES, et CNRS |
Rok vydání: | 2007 |
Předmět: |
Materials science
ULTRAVIOLET IMAGES Analytical chemistry Aerospace Engineering 02 engineering and technology Combustion 01 natural sciences Methane FRACTION NO 010305 fluids & plasmas COMBUSTION chemistry.chemical_compound METHANE 020401 chemical engineering 0103 physical sciences Emission spectrum 0204 chemical engineering Laser-induced fluorescence INDUCED INCANDESCENCE Quenching (fluorescence) JET FLAMES [SPI.FLUID]Engineering Sciences [physics]/Reactive fluid environment Mechanical Engineering DIFFUSION FLAMES Light intensity Fuel Technology chemistry Space and Planetary Science Planar laser-induced fluorescence Liquid oxygen |
Zdroj: | Journal of Propulsion and Power Journal of Propulsion and Power, American Institute of Aeronautics and Astronautics, 2007, Volume: 23 (Issue: 3), pp.Pages: 593-602. ⟨10.2514/1.24895⟩ |
ISSN: | 1533-3876 0748-4658 |
Popis: | International audience; Abstract: The application of planar laser-induced fluorescence of OH to high-pressure liquid oxygen/gaseous methane flames is investigated in this article. As pressure is increased, the maximum level of OH fluorescence decreases while an interfering light intensity increases. It is shown that suitable data can only be obtained by properly tuning the detection scheme. Narrowband filtering of OH fluorescence is required to reduce the level of interfering signals. An analysis of the interfering light indicates that it is associated with polycyclic aromatic hydrocarbon fluorescence originating from a region surrounding the flame. OH and polycyclic aromatic hydrocarbon fluorescence signal amplitudes become comparable at a pressure of 2.5 MPa which constitutes an upper bound for standard imaging. Below that limit the flame is well characterized and features thin, wrinkled OH layers developing in the vicinity of the liquid oxygen jet. The initial flame sheet is continuous but it becomes highly corrugated further downstream when the liquid oxygen jet breaks down. The flame edge standoff distance is greater than a few LOx post lip sizes indicating that stabilization is less well achieved than in the case of liquid oxygen/hydrogen flames where combustion typically begins at less than one lip size from the injector. |
Databáze: | OpenAIRE |
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