Abstract
The fluctuating pressures created by the mixing of a jet exhaust with the ambient air are viewed as the primary sources of radiated jet noise. Apparatus for measuring these in-jet pressures is described and measurements of the spatial and frequency characteristics of the in-jet pressures are presented. Jet pressure and radiated acoustic pressure cross-correlation measurements are used to determine the location of the jet noise sources as a function of frequency and jet Mach number. [Work sponsored by Air Force Aeropropulsion Laboratory.]
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