NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Collections About News Help Login
Back to Results
Duct Mode Measurements on the TFE731-60 Full Scale EngineA continuously rotating rake with radial microphones was developed to measure the inlet and exhaust duct modes on a TFE731-60 turbofan engine. This was the first time the rotating rake technology was used on a production engine. The modal signature for the first three fan harmonics was obtained in the inlet and exhaust. Rotor-stator and rotor-strut interaction modes were measured. Total harmonic power was calculated over a range of fan speeds. Above sonic tip speed, the rotor locked mode was not strong enough to be identified, but the 'buzz-saw' noise at fan sub-harmonics was identified.
Document ID
20020063425
Acquisition Source
Glenn Research Center
Document Type
Technical Memorandum (TM)
Authors
Sutliff, Daniel L. (Sest, Inc. Middleburgh Heights, OH United States)
Konno, Kevin E. (NASA Glenn Research Center Cleveland, OH United States)
Heidelberg, Laurence J. (NASA Glenn Research Center Cleveland, OH United States)
Date Acquired
September 7, 2013
Publication Date
May 1, 2002
Subject Category
Aircraft Propulsion And Power
Report/Patent Number
NASA/TM-2002-211573
NAS 1.15:211573
E-13310
Meeting Information
Meeting: Eighth Aeroacoustics Conference
Location: Breckenridge, CO
Country: United States
Start Date: June 17, 2002
End Date: June 19, 2002
Sponsors: Confederation of European Aerospace Societies, American Inst. of Aeronautics and Astronautics
Funding Number(s)
CONTRACT_GRANT: NAS3-27600
CONTRACT_GRANT: NAS3-00170
PROJECT: RTOP 781-30-11
CONTRACT_GRANT: NAS3-97151
Distribution Limits
Public
Copyright
Public Use Permitted.

Related Records

There are no records associated with this record.
No Preview Available