Abstract
A Droplet Burning Facility for investigating droplet vaporization and burning under various dynamic and thermal conditions, has been constructed. The system was operated during the parabolic flights of the NASA KC135 aircraft. Important data were obtained for the low temperature vaporization, and the envelope or wake flame burning of suspended n-heptane droplets under reduced gravity conditions. From the digitized images of a rapid video camera, the time evolution of the dimensions of the droplet and of the flame were determined with great accuracy. The information is used to deduce the vaporization rate, the flame diameter, and the flame standoff ratio under various conditions. The data at reduced gravity conditions are compared with those under normal gravity conditions obtained with the same apparatus. The Reynolds number dependency of the vaporization rate under reduced and normal gravity conditions is also discussed.
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