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Measurements and predictions of flyover and static noise of an afterburning turbofan engine in an F-111 airplaneThe noise of the TF30 afterburning turbofan engine in an F-111 airplane was determined from static (ground) and flyover tests. Exhaust temperatures and velocity profiles were measured for a range of power settings. Comparisons were made between predicted and measured jet mixing, internal, and shock noise. It was found that the noise produced at static conditions was dominated by jet mixing noise, and was adequately predicted by current methods. The noise produced during flyovers exhibited large contributions from internally generated noise in the forward arc. For flyovers with the engine at nonafterburning power, the internal noise, shock noise, and jet mixing noise were accurately predicted. During flyovers with afterburning power settings, however, additional internal noise believed to be due to the afterburning process was evident; its level was as much as 8 decibels above the nonafterburning internal noise.
Document ID
19790045378
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Burcham, F. W., Jr.
(NASA Flight Research Center Propulsion Controls Branch, Edwards, Calif., United States)
Date Acquired
August 9, 2013
Publication Date
January 1, 1979
Subject Category
Aircraft Propulsion And Power
Report/Patent Number
AIAA PAPER 79-7018
Meeting Information
Meeting: International Symposium on Air Breathing Engines
Location: Orlando, FL
Start Date: April 1, 1979
End Date: April 6, 1979
Accession Number
79A29391
Distribution Limits
Public
Copyright
Other

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