TY - GEN
T1 - Design and analysis of a supersonic jet noise reduction concept
AU - Pilony, Anthony R.
AU - Powers, Ussell W.
AU - McLaughlin, Dennis K.
AU - Morris, Philip J.
PY - 2014
Y1 - 2014
N2 - The design and analysis of a simple jet noise reduction concept is discussed. The concept is intended for use on the type of supersonic exhaust nozzles typically employed on tactical aircraft. The concept addresses both broadband shock associated noise (BBSAN), and turbulent mixing noise. BBSAN is addressed through a reduction in the effective exhaust area, which reduces the strength of the shock cell structure in the jet. Turbulent mixing noise is reduced by enhancement of mixing in the jet shear layer, which creates a shorter region of strongly turbulent ow, and breaks up the large scale turbulent structures. This paper describes an active control device that de ects a fraction of the adjustable seals in the divergent section of the engine exhaust nozzle. After takeoff, the de ected seals would be returned to their unde ected position. Very favorable jet noise reductions are demonstrated at multiple observer angles for nominal takeoff conditions.
AB - The design and analysis of a simple jet noise reduction concept is discussed. The concept is intended for use on the type of supersonic exhaust nozzles typically employed on tactical aircraft. The concept addresses both broadband shock associated noise (BBSAN), and turbulent mixing noise. BBSAN is addressed through a reduction in the effective exhaust area, which reduces the strength of the shock cell structure in the jet. Turbulent mixing noise is reduced by enhancement of mixing in the jet shear layer, which creates a shorter region of strongly turbulent ow, and breaks up the large scale turbulent structures. This paper describes an active control device that de ects a fraction of the adjustable seals in the divergent section of the engine exhaust nozzle. After takeoff, the de ected seals would be returned to their unde ected position. Very favorable jet noise reductions are demonstrated at multiple observer angles for nominal takeoff conditions.
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M3 - Conference contribution
AN - SCOPUS:84902777283
SN - 9781624102561
T3 - 52nd AIAA Aerospace Sciences Meeting - AIAA Science and Technology Forum and Exposition, SciTech 2014
BT - 52nd AIAA Aerospace Sciences Meeting - AIAA Science and Technology Forum and Exposition, SciTech 2014
PB - American Institute of Aeronautics and Astronautics Inc.
T2 - 52nd AIAA Aerospace Sciences Meeting - AIAA Science and Technology Forum and Exposition, SciTech 2014
Y2 - 13 January 2014 through 17 January 2014
ER -