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Measurements of Infrared Radiation Characteristics of a Small Kerosene/Gaseous Oxygen Hot Gas Generator.
ARMY MISSILE RESEARCH DEVELOPMENT AND ENGINEERING LAB REDSTONE ARSENAL ALA ADVANCED SENSORS DIRECTORATE
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Experimental measurements of the spatial and spectral distribution of infrared radiation emitted from the exhaust plume of a small kerosenegaseous oxygen hot gas generator operating at ambient conditions were obtained for oxidizerfuel ratios between 1.15 and 3.0. The axial distribution of infrared radiant intensity was observed to have a series of maxima and minima hot spots which corresponded to the location of shock waves or Mach discs in the central portion of the exhaust plume. For oxidizerfuel ratios less than 3, the radiation peak occurred many nozzle radii downstream and the magnitude of the radiant intensity was larger than the peak value behind the first reflected shock wave. For oxidizerfuel ratios greater than 3, the peak radiation occurred in the first shock-heated zone. It was observed that even though the shock heated regions produced locally very high values of the radiant intensity, the majority of the total radiation is emitted from the afterburning plume downstream of the shock zones. The spectral distribution measurements indicated that the principal radiation was in the 4.4 micrometer band from hot water vapor and carbon dioxide.
APPROVED FOR PUBLIC RELEASE