Laser-spectroscopic investigation of OH-radical concentrations in the exhaust plane of jet engines

Details Laser-spectroscopic investigation of OH-radical concentrations in the exhaust plane of jet engines Laser-spectroscopic investigation of OH-radical concentrations in the exhaust plane of jet engines

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.1849b&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 13, p. 1849-1852

Physics

1

Atmospheric Composition And Structure: Biosphere/Atmosphere Interactions, Atmospheric Composition And Structure: Middle Atmosphere-Composition And Chemistry, Atmospheric Composition And Structure: Pollution-Urban And Regional, Atmospheric Composition And Structure: Instruments And Techniques

Scientific paper

Hydroxyl radical (OH) emissions are relevant for oxidation reactions in the post flame chemistry of exhaust gases emitted from jet engines. No direct measurements of OH concentrations are available to date due to the low abundance and the short lifetime of this radical species. The first application of a combined technique based on Raman scattering and laser-induced fluorescence (LIF) spectrometry is presented here for measurements in the exhaust gases of a commercial jet engine operated in a test rig. From the measurements, upper limits for OH concentrations in the exit plane were determined in the range of 90 ppbv for take off and 80 ppbv for ap-idle. The values are significantly below the predictions of model calculations based on HONO and HNO3 inflight concentration measurements presented recently. Possibilities for further increase of the detection sensitivity for OH are discussed.

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