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Vortex Structure Investigation by LDV for Two Rotor Blade Tips in Forward Flight

Beesten, B.M.J. (1) and Seelhorst, U. (1994) Vortex Structure Investigation by LDV for Two Rotor Blade Tips in Forward Flight. In: Proceedings: 20th European Rotorcraft Forum, 4.-7.10.94, Amsterdam/NL.

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Abstract

The measurement of local flow vectors at positions near the helicopter rotor were performed with a three component Laser- Doppler-Velocimeter (3D LDV). The new conception of 3D-LDV brought good progress concerning sensitivity, data rate and third component resolution. A position monitoring system gave access to blade motion parameters (lead-lag motion, pitching and angle of incidence) at any chosen radial position of the blade, where LDV measurements were performed. The measurements gave principle results concerning the structure of a blade tip vortex in forward flight condition. For example the vortex core radius has been obtained as well as the speed of vortex roll up. Since the tests were run with two different blade tips, a regular square tip for reference and a non-planar tip called winglet, the influence of these winglets on vortex structure and BVI behaviour was investigated. In addition to the vortex parameter like location of the 3D-LDV measurements yield results concerning the orientation of the vortex axis in space, 3D-vorticity and the temporal roll up of the different blade tip vortices.

Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=1994,
Title:Vortex Structure Investigation by LDV for Two Rotor Blade Tips in Forward Flight
Authors:
AuthorsInstitution or Email of Authors
Beesten, B.M.J. (1)UNSPECIFIED
Seelhorst, U.UNSPECIFIED
Date:1994
Journal or Publication Title:Proceedings: 20th European Rotorcraft Forum, 4.-7.10.94, Amsterdam/NL
Status:Published
Keywords:Three component Laser-Doppler-Velocimeter (3D LDV), structure of a blade tip vortex, non-planar tip, BVI, cortex core size
HGF - Research field:UNSPECIFIED
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:UNSPECIFIED
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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