COMPRESSIBLE JET SPREAD PARAMETER FOR MIXING ZONE ANALYSES

Abstract

in ballistic ranges. Profiles of the radiation intensity across the wake may be made every few body diameters with an optical resolution of a small fraction of a body diameter. The data from the instrument have been used to reconstruct radiation histories, measure intensity decay, and measure the growth of luminous wakes. Because of the greater sensitivity of photoelectric devices relative to photographic film, the wake scanner can provide luminous growth data farther downstream in the wake than the race track technique. By using optical filters, the wake scanner can provide spectral as well as time and spatial resolution, yielding further information on the chemistry and temperature of the wake.