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Effect of non-uniform rotation on acoustics and aerodynamics of propellers.

Ahmed, S.R. and Yin, J.P. and Dobrzynski, W. (1997) Effect of non-uniform rotation on acoustics and aerodynamics of propellers. In: Proceedings 5th International Congress on Sound and Vibration 1997, Vol. II, pp. 607-614. 5th International Congress on Sound and Vibration, University of Adelaide, South Australia, 15.-18.12.1997..

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Abstract

This numerical study investigates the influence of non-uniform rotation on the aerodynamics and acoustics of multi-blade propellers.Non-uniform rotational motion is inherent to piston engine driven propellers. the effect of rotational speed non-uniformity is the generation of excess harmonic noise due to unsteady aerodynamic blade-loading. In case of mismatch between periodicity of non-uniformity and the basic blade passing frequency, additional harmonics are generated due to the complex blade kinematics. For a periodicity coincidence the effects are masked due to overlapping of the frequencies. The level of such extra harmonics may be high enough to dominate the overall A-weighted noise level. Propeller noise radiation for non-uniform rotation is no longer omnidirectional along azimuth and exhibits also a different characteristic in the polar direction.

Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=1997,
Title:Effect of non-uniform rotation on acoustics and aerodynamics of propellers.
Authors:
AuthorsInstitution or Email of Authors
Ahmed, S.R.UNSPECIFIED
Yin, J.P.UNSPECIFIED
Dobrzynski, W.UNSPECIFIED
Date:1997
Journal or Publication Title:Proceedings 5th International Congress on Sound and Vibration 1997
Volume:Vol. II
Page Range:pp. 607-614
Status:Published
Keywords:Unsteady panel method, aerodynamics of propellers, pressure time history, acoustic spectrum
Event Title:5th International Congress on Sound and Vibration, University of Adelaide, South Australia, 15.-18.12.1997.
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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