NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Distortion-rotor interaction noise produced by a drooped inletThe 'drooped' inlet used on most wing mounted engines produces a wall static pressure distortion at the fan face of about plus or minus 2%. The interaction of the fan rotor with this fixed distortion pattern produces blade passing frequency and harmonic tone levels in flight which contribute to forward radiated engine noise spectra. Data from a wind tunnel test, using both a drooped inlet and an inlet with no droop, show large changes in forward radiated noise levels over a limited fan speed range. An analytical model of this fan noise mechanism is developed and is used to account for the major features of the measured results.
Document ID
19800051824
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Smith, E. B.
(General Electric Co. Cincinnati, OH, United States)
Moore, M. T.
(General Electric Co. Cincinnati, OH, United States)
Gliebe, P. R.
(General Electric Co., Aircraft Engine Group, Cincinnati Ohio, United States)
Date Acquired
August 10, 2013
Publication Date
June 1, 1980
Subject Category
Acoustics
Report/Patent Number
AIAA PAPER 80-1050
Meeting Information
Meeting: Aeroacoustics Conference
Location: Hartford, CT
Start Date: June 4, 1980
End Date: June 6, 1980
Sponsors: American Institute of Aeronautics and Astronautics
Accession Number
80A35994
Funding Number(s)
CONTRACT_GRANT: NAS2-8675
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available