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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.
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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: |
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| 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: | L - no assignement | ||||||
| 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 |
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