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A study of flow and noise from supersonic plug nozzles

AIAA 2021-2304
Session: Jet Noise IX
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Nozzles with internal mixers and external plugs are candidates for supersonic aircraft concepts. A plug nozzle has certain advantages and offers an alternative to a convergent-divergent nozzle. In this study the focus is on possible noise reduction potential of the plug nozzle during landing and takeoff operation of the aircraft. A model-scale experimental study has been planned, however, due to the COVID-19 closure of the facilities it could not be conducted for over a year. Only recently a brief access to the laboratory permitted a preliminary experiment. Thus, in this paper we take a step back and provide a review of the historical evolution of plug nozzles with an eye for their noise emission characteristics. This is followed by a description of the planned experimental study and accompanying CFD effort. Preliminary CFD results on the importance of the plug geometry with regards to thrust performance are discussed.