Abstract
The mixing region of a jet is observed to be a complex noise generator. The noise produced is highly directional and is a function of the jet size, velocity, density, and turbulence level. Experimental studies of the noise from a series of model subsonic jets ranging in diameter from 0.75 to 12.0 inches in diameter are compared with data for a turbojet engine. The noise generated by this engine was found to be closely related to that generated by the simple model jets, and an empirical relation is given to allow the extrapolation of available jet noise data to other operating conditions. In addition, an attempt is made to correlate the noise data with some aerodynamic measurements inside the jet, and a brief discussion is given of recent experiments with devices designed to alter the jet noise spectrum. Data are presented in a form convenient for comparison with Lighthill's theory.
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