Abstract
The Background Oriented Schlieren (BOS) method has been used to qualitatively identify the (variation of) density gradients in the helical structure of a propeller slipstream. The helical structures are identified for two sideslip angles. In contrast to standard BOS correlations between exposures and a reference image, two exposures at a given time interval were cross-correlated. This revealed a more clear description of the propeller slipstream as it determines the variation of the density gradient during this interval. It enhances the visualization of the helical structure of the propeller slipstream. Based on the visualizations of the blade tip vortex trajectories the propeller slipstream contraction can be estimated.
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Eric W.M. Roosenboom: He received his B.Sc. (2003) and M.Sc. in Aerospace Engineering (2005) from the Delft University of Technology. He worked shortly in the Aerodynamics department at the faculty of Aerospace Engineering in 2005. Since 2006 he is employed by DLR (German Aerospace Center) as a research scientist, in a partnership with Airbus Germany. His research interests are (experimental) aerodynamics, PIV, BOS, unsteady flow phenomena, flow statistics, coherent structures and propeller flow.
Andreas Schröder: He received his diploma degree in physics in 1996 and his PhD degree (Dr. rer. nat.) in 2001 from the Univ. of Göttingen. Since 1997 he works as a research scientist at DLR (German Aerospace Center) in Göttingen with special emphasis on the application of PIV and 3D PIV to turbulent and transitional boundary layers and in project leader position for several research and industry projects using Stereo PIV and BOS techniques in aerodynamic testing in industrial wind tunnels. He is organizer of the annual international PIV Course at the DLR in Göttingen, 2002–2008 (http://pivcourse.dlr.de) and was coordinator of EC funded the thematic network Particle Image Velocimetry “PivNet 2” (38 partners) from May 2004 to December 2008 (http://pivnet.dlr.de).
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Roosenboom, E.W.M., Schröder, A. Qualitative investigation of a propeller slipstream with Background Oriented Schlieren. J Vis 12, 165–172 (2009). https://doi.org/10.1007/BF03181958
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DOI: https://doi.org/10.1007/BF03181958