Recent Advances in Exhaust Systems for Jet Suppression of High-speed Aircraft

Jet noise has been recognized as a major problem for supersonic transport aircraft. A considerable amount of technology has been developed in the past few years that is applicable to suppression of high-speed aircraft noise. This paper summarizes the types of activities that have been conducted and presents the results of a recent jet noise suppression demonstrator. These data are applied to the U.S. SST B2707-3000 airplane in order to evaluate the impact of current technology. It is shown that the suppressor is a viable nozzle system that would allow the noise levels of the SST to meet FAR Part 36 requirements. This is accomplished in a manner that would allow growth versions of the airplanes.