An ultra-high-speed tracking camera was developed at NASA Lewis Research Center to photograph ethanol sprays accelerating and burning in a 2-inch-diameter by 16-inch-length rocket combustor with liquid oxygen as the oxidant. Thus, drop-size-distribution data for the breakup of ethanol jets inside the combustor were obtained from photomicrographs of the spray taken 4 inches downstream from the injector face.nAnalyses of the drop-size-distribution data with the NukiyamaTanasawa and log-probability expressions gave volume-median drop diameters of 154 and 158 microns, respectively, which agreed well with the value of 152 microns obtained by direct integration of the data. However, the Rosin-Rambler expression gave a considerably lower value of 116 microns. The maximum observed drop size was 344 microns.
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