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Characterisation of blade tip vortices by simultaneous time-resolved velocity and density field measurements

Lang, Waldemar and Mulleners, Karen and Hernandez-Rivera, Ricardo and Schairer, Edward T. and Heineck, James T. and Raffel, Markus (2012) Characterisation of blade tip vortices by simultaneous time-resolved velocity and density field measurements. International Workshop on the Application of Praticle Image Velocimetry for Aeroacoustics and Noise, 16. - 17. Apr. 2012, Delft, The Netherlands.

Full text not available from this repository.

Abstract

The flow field around a helicopter is dominated by strong coherent vortices originating from the blade tip as a result of the pressure difference between suction and pressure side and a high radial velocity at the tip (Leishman, 2001; Green and Acosta, 1991). These vortices have a strong impact on the rotorcraft acoustics and performance due to its interactions with the rotor blades and the helicopter fuselage (Conlisk, 2001). Detailed knowledge of the vortex development, in particular of the formation process, and the scaling of characteristic parameters, e.g. vortex size and strength, are necessary for the design and the optimisation of vortex control measures. Due to the complexity and the inherent unsteady character of the vortex dynamics, this can only be achieved by time-resolved measurements of the velocity and density field simultaneously.

Document Type:Conference or Workshop Item (Speech, Paper)
Additional Information:Vortrag wurde von Prof. Markus Raffel gehalten
Title:Characterisation of blade tip vortices by simultaneous time-resolved velocity and density field measurements
Authors:
AuthorsInstitution or Email of Authors
Lang, WaldemarUNSPECIFIED
Mulleners, KarenLeibniz Universität Hannover
Hernandez-Rivera, RicardoUNSPECIFIED
Schairer, Edward T.NASA Ames Research Center, Moffett Field, CA, USA
Heineck, James T.NASA Ames Research Center, Moffett Field, CA, USA
Raffel, MarkusUNSPECIFIED
Date:2012
Refereed publication:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 1-3
Series Name:Book of Abstracts
Status:Published
Keywords:background oriented schlieren (BOS), particle image velocimetry (PIV), simultaneous time-resolved velocity
Event Title:International Workshop on the Application of Praticle Image Velocimetry for Aeroacoustics and Noise
Event Location:Delft, The Netherlands
Event Type:Workshop
Event Dates:16. - 17. Apr. 2012
Organizer:TU Delft
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Simulation & Validation
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Helicopters
Institute of Aerodynamics and Flow Technology > Experimental Methods
Deposited By: Ilka Micknaus
Deposited On:20 Apr 2012 13:26
Last Modified:15 Jan 2013 11:50

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