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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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|
|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|
|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|
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