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Radiative Transfer Model of a Pyrotechnic Flame
NAVAL AMMUNITION DEPOT CRANE IN
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A two-line radiative transfer model of a pyrotechnic illuminating flare flame was formulated and validated. The model is capable of predicting the spectral radiant flux of different illuminating flares from known system variables such as formula, size, and ambient pressure, these having been varied over a wide range. Relative radiant power spectra are presented of the flames from three different pyrotechnic flare formulas burning at ambient pressures of 760, 630, 300, 225, 150, 75, 30 and 6 torr. The sodium concentration in the flare formulas varies by a factor of 10 between each formula. The experimental spectra of these illuminating flare flames show the magnitude of sodium D line broadening as a function of ambient pressure and sodium atom density in the flame. A set of theoretical spectra, computed using the two-line radiative transfer model, are presented for comparison with the experimental spectra.
APPROVED FOR PUBLIC RELEASE