elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Contact | Deutsch
Fontsize: [-] Text [+]

The Noise from Piston Engine Driven Propellers on General Aviation Airplanes

Dobrzynski, W. and Gehlhar, B. (1997) The Noise from Piston Engine Driven Propellers on General Aviation Airplanes. In: 3rd AIAA/CEAS Aeroacoustics Conference, Atlanta/GA, USA, 12.-14.5.1997, Paper No. AIAA/CEAS 97-1708.

Full text not available from this repository.

Abstract

Analysis of extensive flyover noise data from piston engine powered propeller aeroplanes (General Aviation Aeroplanes) revealed the occurrence of - at first sight quite unexplainable - additional noise components which were, however, clearly related to propeller operation. It turns out that such "excess" propeller noise is a direct result of a nonuniform rotation of the piston engine crank- shaft which causes unsteady aerodynamic propeller blade-loadings. Associated propeller noise characteristics were determined in the framework of wind tunnel tests for a number of full-scale piston- engine/propeller combinations. The subject noise type was found most pronounced at low helical blade-tip Mach numbers and in the forward and the rear arc directions. Azimuthal noise directivity was no longer omnidirectional. Moreover, overall A-weighted propeller noise levels were found to increase by more than 5 dB as a result of such RPM-nonuniformity vs. that of a propeller.

Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=1997, pages=14,
Title:The Noise from Piston Engine Driven Propellers on General Aviation Airplanes
Authors:
AuthorsInstitution or Email of Authors
Dobrzynski, W.UNSPECIFIED
Gehlhar, B.UNSPECIFIED
Date:1997
Journal or Publication Title:3rd AIAA/CEAS Aeroacoustics Conference, Atlanta/GA, USA, 12.-14.5.1997, Paper No. AIAA/CEAS 97-1708
Series Name:AIAA/CEAS 97-1708
Status:Published
Keywords:Propeller Noise, Nonuniform Propeller Rotational Speed
HGF - Research field:UNSPECIFIED
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:UNSPECIFIED
DLR - Program:L ST - Starrflüglertechnologien
DLR - Research theme (Project):L - Quiet Air Traffic (old)
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 10:06

Repository Staff Only: item control page

Browse
Search
Help & Contact
Informationen
electronic library is running on EPrints 3.3.12
Copyright © 2008-2012 German Aerospace Center (DLR). All rights reserved.