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Rotor Wake Vortex Definition using 3C-PIV Measurements - Corrected for Vortex Orientation

Burley, Casey L. and Brooks, Thomas F. and van der Wall, Berend G. and Richard, Hugues and Raffel, Markus and Beaumier, Philippe and Delrieux, Yves and Lim, Joon W. and Yu, Jung H. and Tung, Chee and Pengel, Kurt and Mercker, Edzard (2003) Rotor Wake Vortex Definition using 3C-PIV Measurements - Corrected for Vortex Orientation. 9th AIAA/CEAS Aeroacoustics Conference, 2003-05-12 - 2003-05-14, Hilton Head, SC (USA).

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Three-component (3-C) particle image velocimetry (PIV) measurements, within the wake across a rotor disk plane, are used to determine wake vortex definitions important for BVI (Blade Vortex Interaction) and broadband noise prediction. This study is part of the HART II test program conducted using a 40 percent scale BO-105 helicopter main rotor in the German-Dutch Wind Tunnel (DNW). In this paper, measurements are presented of the wake vortex field over the advancing side of the rotor operating at a typical descent landing condition. The orientations of the vortex (tube) axes are found to have non-zero tilt angles with respect to the chosen PIV measurement cut planes, often on the order of 45 degrees. Methods for determining the orientation of the vortex axis and reorienting the measured PIV velocity maps (by rotation/projection) are presented. One method utilizes the vortex core axial velocity component, the other utilizes the swirl velocity components. Key vortex parameters such as vortex core size, strength, and core velocity distribution characteristics are determined from the reoriented PIV velocity maps. The results are compared with those determined from velocity maps that are not corrected for orientation. Knowledge of magnitudes and directions of the vortex axial and swirl velocity components as a function of streamwise location provide a basis for insight into the vortex evolution.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:Rotor Wake Vortex Definition using 3C-PIV Measurements - Corrected for Vortex Orientation
AuthorsInstitution or Email of Authors
Burley, Casey L.NASA Langley
Brooks, Thomas F.NASA Langley
van der Wall, Berend G.UNSPECIFIED
Richard, HuguesUNSPECIFIED
Beaumier, PhilippeONERA
Delrieux, YvesONERA
Lim, Joon W.AFDD
Yu, Jung H.AFDD
Tung, CheeAFDD
Pengel, KurtDNW
Mercker, EdzardDNW
Refereed publication:No
In ISI Web of Science:No
Keywords:HART, PIV
Event Title:9th AIAA/CEAS Aeroacoustics Conference
Event Location:Hilton Head, SC (USA)
Event Type:international Conference
Event Dates:2003-05-12 - 2003-05-14
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Rotorcraft
DLR - Research area:Aeronautics
DLR - Program:L RR - Rotorcraft Research
DLR - Research theme (Project):L - The Active Rotorcraft (old)
Location: Braunschweig , Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Helicopters
Institute of Flight Systems > Rotorcraft
German-Dutch Windtunnels
Deposited By: Dr.-Ing. Berend G. van der Wall
Deposited On:12 Dec 2005
Last Modified:27 Apr 2009 04:45

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