Contrails
The goal of the Contrails project is to help preserve and disseminate the technical record of 20th century aerospace research, highlighting in particular the research endeavors of the Illinois Tech community.

Liquid Injection into a Supersonic Stream

Report Number: AFAPL TR 71-97 Volume 1
Author(s): Yates, C. L.
Corporate Author: Air Force Aero Propulsion Lab
Laboratory: Air Force Aero Propulsion Laboratory
Date of Publication: 1972-03
Pages: 116
Contract: N00017-72-C-4401
Project: None Given
AD Number: AD0741887

Abstract:
Photographic data were obtained for the transverse injection of water and isopropyl alcohol from a flat-plate into airstreams having Mach numbers of 1.62 and 2.72. Jet/freestream dynamic pressure ratio, jet Reynolds and Weber numbers, and freestream Reynolds number were varied by factors of 8, 10, 11, and 3, respectively, in the jet penetration tests, and by factors of 23, 4, 9, and 5 in the jet spreading tests. Improved empirical equations for jet penetration and width were developed and were substantiated for two sets of test conditions by detailed flow-field mapping 50 jet diameters downstream using pitot-pressure, cone-static-pressure, and heated sampling probes. Since the injectant spacial distributions from the two tests were nearly similar on a nondimensionalized scale, it may be possible to use these data to predict distributions for other conditions. Finally, an improved theorectical analysis not only predicts jet penetration more accurately than previous ones, but also predicts the transverse distribution of injectant mass.

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