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Measurement of Vortical Structures on a Helicopter Rotor Model in a Wind Tunnel by LDV and PIV

Raffel, M. and Seelhorst, U. and Willert, C. and Vollmers, H. and Bütefisch, K.A. and Kompenhans, J. (1996) Measurement of Vortical Structures on a Helicopter Rotor Model in a Wind Tunnel by LDV and PIV. In: Eighth International Symposium on Applications of Laser Techniques to Fluid Mechanics, 14.3.1-14.3.6. Eighth International Symposium on Applications of Laser Techniques to Fluid Mechanics, Lisbon, Portugal, July 1996.

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Abstract

With increasing use of civil helicopters the problem of noise emission of helicopters become more and more important within the last decade. Therefore, helicopter noise has been subject of many research projects (1). Blade Vortex Interactions (BVI) are known as a major source of impulsive noise. As BVI-noise is governed by the induced velocities of tip vorticies, it depends on vortex strength and miss-distance, which itself depends on vortex location and orientatioand convection speed relative to the path of the advancing blade. Therefore, the study of these phenomena is of particular interest for progress towards quieter helicopters. Such vortical structures at a helicopter rotor model in a wind tunnel has been studied by optical measurement techniques, since only non-intrusive techniques are capable to obtain velocity data within the rotor plane. Measurements of local flow vectors at positions close to the rotor blade tips were performed by three component Laser Doppler Velocimetry (3D-LDV) and conventional (two component) Particle Image Velocimetry (PIV).

Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=1996,
Title:Measurement of Vortical Structures on a Helicopter Rotor Model in a Wind Tunnel by LDV and PIV
Authors:
AuthorsInstitution or Email of Authors
Raffel, M.UNSPECIFIED
Seelhorst, U.UNSPECIFIED
Willert, C.UNSPECIFIED
Vollmers, H.UNSPECIFIED
Bütefisch, K.A.UNSPECIFIED
Kompenhans, J.UNSPECIFIED
Date:1996
Journal or Publication Title:Eighth International Symposium on Applications of Laser Techniques to Fluid Mechanics
Page Range:14.3.1-14.3.6
Status:Published
Keywords:Helicopter Noise, Blade Vortex Interactions, Tip Vortices, Advancing Blade, Three Component Laser Doppler Velocimetry, Particle Image Velocimetry
Event Title:Eighth International Symposium on Applications of Laser Techniques to Fluid Mechanics, Lisbon, Portugal, July 1996
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:Aeronautics
DLR - Program:L DT - Drehflüglertechnologien
DLR - Research theme (Project):UNSPECIFIED
Location: Köln-Porz , Braunschweig , Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Institut für Strömungsmechanik > Institut für Experimentelle Strömungsmechanik
Deposited By: elib DLR-Beauftragter
Deposited On:03 Apr 2006
Last Modified:27 Apr 2009 10:08

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