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

Ahmed, Syed R. and Yin, Jianping and Dobrzynski, Werner (1997) Effect of non-uniform rotation on acoustics and aerodynamics of propellers. In: 5th International Congress on Sound and Vibration, 2, pp. 607-614. Proceedings 5th International Congress on Sound and Vibration 1997. 5th ICSV, 1997-15-12 - 1997-18-12, University of Adelaide, South Australia.

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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.

Item URL in elib:https://elib.dlr.de/19907/
Document Type:Conference or Workshop Item (Paper)
Title:Effect of non-uniform rotation on acoustics and aerodynamics of propellers
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Ahmed, Syed R.UNSPECIFIEDUNSPECIFIED
Yin, JianpingUNSPECIFIEDUNSPECIFIED
Dobrzynski, WernerUNSPECIFIEDUNSPECIFIED
Date:December 1997
Journal or Publication Title:5th International Congress on Sound and Vibration
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:2
Page Range:pp. 607-614
Publisher:Proceedings 5th International Congress on Sound and Vibration 1997
Status:Published
Keywords:Unsteady panel method, aerodynamics of propellers, pressure time history, acoustic spectrum
Event Title:5th ICSV
Event Location:University of Adelaide, South Australia
Event Type:international Conference
Event Dates:1997-15-12 - 1997-18-12
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:L VU - Air Traffic and Environment (old)
DLR - Research area:Aeronautics
DLR - Program:L VU - Air Traffic and Environment
DLR - Research theme (Project):L - Quiet Air Traffic (old)
Location: Braunschweig
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Technical Acoustics
Deposited By: Yin, Dr.-Ing. Jianping
Deposited On:01 Dec 2005
Last Modified:27 Apr 2009 04:44

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