Abstract
This chapter presents a possible approach for the suppression of the dominant large-scale mixing noise sources in a supersonic jet. One of the dominant sources of noise from a high-speed jet is intimately related to the large-scale vortical structures that convect at supersonic speeds relative to the ambient medium. Microjets are used to reduce screech tones, Mach-wave radiation/crackle, and large-scale mixing noise in supersonic jets. They inject a high-pressure gas at the nozzle exit of supersonic jet. The microjets are effective probably because they inhibit the formation of the large eddies—the consequence of basic jet instabilities—which are responsible for the crackle and the low-frequency component of the mixing noise. When the jet is imperfectly expanded, the commonly observed screech tones are completely suppressed by the microjet injection. The main jet parameters, the nozzle pressure ratio, and the temperature ratio are chosen to correspond with the realistic engine operating conditions.
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