The two-photon photolysis of propane-air mixtures has been investigated as a possible source of tag species for velocity measurements. Emission spectra of the propane photofragments indicate the presence of the C atom, C2, and CN (with the addition of air). Emission at 216 nm is speculated to be from a primary fragment and varies linearly with propane concentration. Emission from the photofragments is shown to be dependent upon the local air-to-fuel ratio. Chemical lifetime measurements of the CN- and CH-radical photofragments indicate a lifetime of 3-5 microseconds. These photofragments can be utilized as tag species in flow fields above 50 m/s.
Laser diagnostics for velocity measurements in supersonic combusting environments
Laserdiagnosen für Geschwindigkeitsuntersuchungen in Überschallverbrennungsregionen
AIAA-Papers ; 1-7
1992
7 Seiten, 16 Bilder, 2 Tabellen, 12 Quellen
Conference paper
English
Turbulence modeling in supersonic combusting flows
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