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Aeroacoustic Wind Tunnel Tests on Full-Scale Propellers with Unsymmetrical Blade Spacing.

Dobrzynski, W. (1990) Aeroacoustic Wind Tunnel Tests on Full-Scale Propellers with Unsymmetrical Blade Spacing. Inter Noise '90, 13-15 August 1990, Goeteborg, Schweden.

Full text not available from this repository.

Abstract

Recent theoretical investigations indicated a noise reduction potential of 3 to 4 dB(A) for aircraft propellers with unsymmetrically spaced blades compared to conventional, symmetrical propellers of identical blade geometry and under identical operational conditions. In orderto validate these predictions, aeroacoustic test were conducted on a full-scale 6-blade propeller in the German-Dutch Wind Tunnel (DNW). The results of this study confirm the theoretical results. For the particular test propeller a maximum noise reduction of about 3 dB(A) was determined for helical blade tip Mach numbers in excess of 0.7 and blade spacing angles in the range from 15 to 20 deg. No detrimental effect on the aerodynamic propeller performance was observed within the operational conditions tested.

Document Type:Conference or Workshop Item (Paper)
Additional Information: institution=Inter Noise, LIDO-Berichtsjahr=1990, pages=4,
Title:Aeroacoustic Wind Tunnel Tests on Full-Scale Propellers with Unsymmetrical Blade Spacing.
Authors:
AuthorsInstitution or Email of Authors
Dobrzynski, W.UNSPECIFIED
Date:1990
Page Range:pp. 475-478
Status:Published
Keywords:Propeller Noise, Propeller Noise Reduction,, Unsymmetrical Blade Spac ing
Event Title:Inter Noise '90, 13-15 August 1990, Goeteborg, Schweden
HGF - Research field:UNSPECIFIED
HGF - Program:other
HGF - Program Themes:other
DLR - Research area:UNSPECIFIED
DLR - Program:no assignment
DLR - Research theme (Project):L - Turbine Technologies
Location: Köln-Porz , Braunschweig , Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Institut für Entwurfsaerodynamik
Deposited By: elib DLR-Beauftragter
Deposited On:03 Apr 2006
Last Modified:27 Apr 2009 10:04

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