NDLI: The use of cowl camber and taper to reduce rotor/stator interaction noise

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The use of cowl camber and taper to reduce rotor/stator interaction noise

Content Provider	NASA Technical Reports Server (NTRS)
Author	Martinez, R.
Copyright Year	1995
Description	The project had two specific technical objectives: (1) to develop a realistic three-dimensional model of tonal noise due to rotor/stator interaction, as the input field for predictions of diffraction and dissipation by a lined cowl; and (2) to determine whether the generator curve of that cowl, or duct, could be 'steered' to yield substantially lower values of propulsor noise along the engine's fore and aft open sectors. The more general and important aim of their research is to provide the commercial aircraft industry with a useful predictive tool to help it meet its noise-reduction goals. The work has produced a tractable and yet realistic model of rotor/stator interaction noise. The blades in the fan stage are radially divergent, twisted, and of realistically wide chords to match the high frequencies and speeds of the sound-production process. The resulting three-dimensional acoustic nearfield insonifies the interior wall of the diffracting cowl, whose shape, incidentally, does not affect fore or aft noise significantly (but other factors do).
File Size	3322698
Page Count	92
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19950016258
Archival Resource Key	ark:/13960/t5p896r59
Language	English
Publisher Date	1995-02-01
Access Restriction	Open
Subject Keyword	Acoustics Cowlings Engine Noise Ducts Noise Reduction Rotors Rotor Stator Interactions Commercial Aircraft Tapering Aircraft Noise Predictions Stators Three Dimensional Models Camber Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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