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Broadband noise prediction for subsonic prop fans

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Date Issued:
1993
Summary:
Broadband noise generated by subsonic ducted propfans is studied for a hard walled flanged duct with an infinite centerbody and in a uniform flow. The interaction between boundary layers and blades and the impingement of the blade wakes on the stators are the main sources of noise considered in the forward and rear arc respectively. An efficient method of programming is presented which reduces the time of computation of expressions. The results obtained are presented and discussed. The boundary layer noise is found to have no sufficient energy at low frequencies regarding the available data, unless the boundary layer thickness is increased by a small amount. Finally, good predictions are obtained with the wake noise although some parameters would require a better evaluation.
Title: Broadband noise prediction for subsonic prop fans.
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Name(s): Petithomme, Michel-Olivier.
Florida Atlantic University, Degree grantor
Glegg, Stewart A. L., Thesis advisor
College of Engineering and Computer Science
Department of Ocean and Mechanical Engineering
Type of Resource: text
Genre: Electronic Thesis Or Dissertation
Issuance: monographic
Date Issued: 1993
Publisher: Florida Atlantic University
Place of Publication: Boca Raton, Fla.
Physical Form: application/pdf
Extent: 148 p.
Language(s): English
Summary: Broadband noise generated by subsonic ducted propfans is studied for a hard walled flanged duct with an infinite centerbody and in a uniform flow. The interaction between boundary layers and blades and the impingement of the blade wakes on the stators are the main sources of noise considered in the forward and rear arc respectively. An efficient method of programming is presented which reduces the time of computation of expressions. The results obtained are presented and discussed. The boundary layer noise is found to have no sufficient energy at low frequencies regarding the available data, unless the boundary layer thickness is increased by a small amount. Finally, good predictions are obtained with the wake noise although some parameters would require a better evaluation.
Identifier: 14925 (digitool), FADT14925 (IID), fau:11707 (fedora)
Collection: FAU Electronic Theses and Dissertations Collection
Note(s): College of Engineering and Computer Science
Thesis (M.S.)--Florida Atlantic University, 1993.
Subject(s): Fans (Machinery)--Noise
Noise control
Rotors--Noise
Held by: Florida Atlantic University Libraries
Persistent Link to This Record: http://purl.flvc.org/fcla/dt/14925
Sublocation: Digital Library
Use and Reproduction: Copyright © is held by the author, with permission granted to Florida Atlantic University to digitize, archive and distribute this item for non-profit research and educational purposes. Any reuse of this item in excess of fair use or other copyright exemptions requires permission of the copyright holder.
Use and Reproduction: http://rightsstatements.org/vocab/InC/1.0/
Host Institution: FAU
Is Part of Series: Florida Atlantic University Digital Library Collections.