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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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)|
|Title:||Measurement of Vortical Structures on a Helicopter Rotor Model in a Wind Tunnel by LDV and PIV|
|Journal or Publication Title:||Eighth International Symposium on Applications of Laser Techniques to Fluid Mechanics|
|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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