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Imaging hydrogen flames by two-photon, laser-induced fluorescenceA nonintrusive multicomponent imaging system is developed which can image hydrogen, hot oxygen, and air simultaneously. An Ar-F excimer laser is injection-locked to cover the Q1 two-photon transition in molecular hydrogen which allows the observation of both hot oxygen and cold hydrogen. Rayleigh scattering from the water molecules occurs at the same frequency as the illuminating laser allowing analysis of the air density. Images of ignited and nonignited hydrogen jets are recorded with a high-sensitivity gated video camera. The images permit the analysis of turbulent hydrogen-core jet, the combustion zone, and the surrounding air, and two-dimensional spatial correlations can be made to study the turbulent structure and couplings between different regions of the flow field. The method is of interest to the study of practical combustion systems which employ hydrogen-air diffusion flames.
Document ID
19910058921
Document Type
Conference Paper
Authors
Miles, R. (Princeton Univ. NJ, United States)
Lempert, W. (Princeton Univ. NJ, United States)
Kumar, V. (Princeton University NJ, United States)
Diskin, G. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 15, 2013
Publication Date
June 1, 1991
Subject Category
INORGANIC AND PHYSICAL CHEMISTRY
Report/Patent Number
AIAA PAPER 91-1493
Distribution Limits
Public
Copyright
Other