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Principle and applications of the background oriented schlieren (BOS) method

Richard, Hugues and Raffel, Markus (2001) Principle and applications of the background oriented schlieren (BOS) method. Measurement Science and Technology, Vol. 12 (9), pp. 1576-1585. INSTITUTE OF PHYSICS PUBLISHING (IOP Publishing Ltd). ISSN 0957-0233.

Full text not available from this repository.

Official URL: http://iopscience.iop.org/0957-0233/12/9/325

Abstract

The practical aspects of an advanced schlieren technique, which has been presented by Meier (1999) and Richard et al (2000) and in a similar form by Dalziel et al (2000), are described in this paper. The application of the technique is demonstrated by three experimental investigations on compressible vortices. These vortices play a major role in the blade vortex interaction (BVI) phenomenon, which is responsible for the typical impulsive noise of helicopters. Two experiments were performed in order to investigate the details of the vortex formation from the blade tips of two different helicopters in flight: a Eurocopter BK117 and a large US utility helicopter. In addition to this, simultaneous measurements of velocity and density fields were conducted in a transonic wind tunnel in order to characterize the structure of compressible vortices. The background oriented schlieren technique has the potential of complementing other optical techniques such as shadowgraphy or focusing schlieren methods and yields additional quantitative information. Furthermore, in the case of helicopter aerodynamics, this technique allows the effect of Reynolds number on vortex development from blade tips to be studied in full-scale flight tests more easily than through the use of laser-based techniques.

Document Type:Article
Additional Information: LIDO-Berichtsjahr=2002, Published: 16 August 2001, Online at: stacks.iop.org/MST/12/1576
Title:Principle and applications of the background oriented schlieren (BOS) method
Authors:
AuthorsInstitution or Email of Authors
Richard, HuguesUNSPECIFIED
Raffel, MarkusUNSPECIFIED
Date:2001
Journal or Publication Title:Measurement Science and Technology
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:Vol. 12
Page Range:pp. 1576-1585
Publisher:INSTITUTE OF PHYSICS PUBLISHING (IOP Publishing Ltd)
ISSN:0957-0233
Status:Published
Keywords:fluid flow density, schlieren technique, flow visualization, transonic wind tunnel, flight testing, helicopter aerodynamics
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 > Fluid Systems
Deposited By: elib DLR-Beauftragter
Deposited On:17 Jan 2008
Last Modified:06 Jun 2013 12:32

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