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.
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Official URL: http://iopscience.iop.org/0957-0233/12/9/325
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.
|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|
|Journal or Publication Title:||Measurement Science and Technology|
|In ISI Web of Science:||Yes|
|Page Range:||pp. 1576-1585|
|Publisher:||INSTITUTE OF PHYSICS PUBLISHING (IOP Publishing Ltd)|
|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)|
|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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