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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) | ||||||||
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| Additional Information: | LIDO-Berichtsjahr=1997, | ||||||||
| Title: | Effect of non-uniform rotation on acoustics and aerodynamics of propellers. | ||||||||
| Authors: |
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| 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: | 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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