Abstract

Planar laser-induced fluorescence of hydroxyl radicals has been performed in a reacting boundary layer with on resolving the complications of performing these measurements in the vicinity of a wall. emphasis Excitation of the (1,0) band of the A²∑-X²Π transition at 282 nm coupled with detection of the fluorescence from the (1,1) and (0,0) bands near 310-nm minimized interference due to scattered light from the flow apparatus. A silicon intensified target detector provided 2-D images of hydroxyl radical concentration in the reacting boundary layer enabling visualization of ignition. Results are shown for the ignition of ethane–air mixtures over heated quartz or platinum surfaces highlighting the utility of the technique.

© 1988 Optical Society of America

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