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Simulated high speed flight effects on supersonic jet noiseA free jet is utilized to investigate the changes in the noise received from supersonic jets in high speed subsonic flight. Flight Mach numbers to 0.9 are simulated for supersonic jets with fully expanded Mach numbers between 1 and 2. Plume pressure measurements show only minor changes in the shock structure of off-design jets up to a Mach number of 0.6. Correspondingly, far-field noise measurements indicate little change to the broadband shock noise emitted at right angles to the jet. However, measurements within the free jet show that convection effects on the noise are substantial, and that the point source convective amplification that is proportional to the fourth power of the Doppler factor may apply for broadband shock noise in flight. Measurements of jet mixing noise for an on-design supersonic jet show that the current predictions of mixing noise in flight can be extended to flight Mach numbers of at least 0.5.
Document ID
19940034696
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Norum, Thomas D.
(NASA Langley Research Center Hampton, VA, United States)
Brown, Martha C.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 16, 2013
Publication Date
October 1, 1993
Subject Category
Acoustics
Report/Patent Number
AIAA PAPER 93-4388
Meeting Information
Meeting: AIAA, Aeroacoustics Conference
Location: Long Beach, CA
Country: United States
Start Date: October 25, 1993
End Date: October 27, 1993
Sponsors: AIAA
Accession Number
94A11351
Distribution Limits
Public
Copyright
Other

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