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Recording and Evaluation Methods of PIV Investigations on a Helicopter Rotor Model.

Raffel, Markus and Richard, Hugues and Schneider, Gert and Klinge, Falk and Ehrenfried, Klaus and Pengel, Kurt and Feenstra, G. (2002) Recording and Evaluation Methods of PIV Investigations on a Helicopter Rotor Model. In: Book of abstracts, paper No. 8.4, Confer (paper ). 11th Intern. Symposium on Applications of Laser Techniques in Fluid Mechanics, 08. - 11. July 2002, Lisbon, Portugal.

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Official URL: http://in3.dem.ist.utl.pt/lxlaser2002/papers.asp

Abstract

Particle image velocimetry (PIV) experiments have been performed in order to derive quantitative flow velocity data of rotor blade tip vortices of a large-scale helicopter model and during a three weeks wind tunnel test. Today, three-component PIV wind tunnel tests at moderate speeds and observation distances can be performed on routine basis. The wind tunnel experiments, on which we will report, have been performed on a rotor model of 4m diameter in the 6m x 8m open test section of the Large Low-speed Facility (LLF) of the German-Dutch Wind Tunnel (DNW) operated at 33m/s. The rotor model used was a 40% Mach scaled model of the MBB Bo105 of the German aerospace establishment DLR in Braunschweig. The rotor consists of four hingeless blades with 0.121m chord length, rectangular blade planform, and -8° linear twist. The airfoil was a NACA 23012 with tabbed trailing edge. During the test, the model was mainly operated in descent flight conditions where blade vortex interaction dominates the noise emission. The rotor rotational frequency was 17.35Hz leading to a tip speed of 218m/s. The PIV system consisted of five digital cameras and three double pulse Nd:YAG lasers with 2x320mJ each, which were mounted onto a common traversing system in order to keep the distance between the cameras and the light sheet constant while scanning the rotor wake. The length of the traversing system was in the order of 10m, the height approximately 15m. More than half a Tera Byte (650GB) of PIV raw data had been recorded at various positions on the advancing and the retreating side. The measurements have been performed in the frame of the HART II program (Y. Yu 2002) and include noise, blade pressure, blade deformation and flow data by means of PIV. This paper focuses on the technical aspects of recording and evaluation of the 3-C PIV.

Document Type:Conference or Workshop Item (Speech, Paper)
Additional Information:LIDO-Berichtsjahr=2002,
Title:Recording and Evaluation Methods of PIV Investigations on a Helicopter Rotor Model.
Authors:
AuthorsInstitution or Email of Authors
Raffel, MarkusUNSPECIFIED
Richard, HuguesUNSPECIFIED
Schneider, GertUNSPECIFIED
Klinge, FalkUNSPECIFIED
Ehrenfried, KlausUNSPECIFIED
Pengel, KurtDNW, Forsterweg 31, 8316 PR Marknesse, The Netherlands
Feenstra, G.DNW, Forsterweg 31, 8316 PR Marknesse, The Netherlands
Date:2002
Journal or Publication Title:Book of abstracts, paper No. 8.4
Volume:Confer
Series Name:Book of abstracts
Status:Published
Keywords:PIV, helicopter, large scale, HART II
Event Title:11th Intern. Symposium on Applications of Laser Techniques in Fluid Mechanics
Event Location:Lisbon, Portugal
Event Type:international Conference
Event Dates:08. - 11. July 2002
HGF - Research field:Aeronautics, Space and Transport
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: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Helicopters
Institute of Aerodynamics and Flow Technology > Experimental Methods
Institute of Aerodynamics and Flow Technology > Fluid Systems
Deposited By: elib DLR-Beauftragter
Deposited On:31 Jan 2006
Last Modified:12 Dec 2013 20:03

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