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Force estimates in turbulent vortex wakes of accelerating propulsors: The effects of edge undulation on vortex formation

Kaiser, Frieder; Galler, Joshua; Kriegseis, Jochen; Rival, David E.

Abstract (englisch):
The effects of edge undulation on separated flows and vortex formation are investigated with various geometries of accelerated, low aspect-ratio propulsors. In addition to force measurements, multi-camera planar particle image velocimetry (PIV) is applied for a large field of view of approximately 1.9 m × 0.3 m. Edge undulations with a wavelength λ, that is significantly larger than the thickness δ of the separated shear layer are identified to enhance the propulsion force during the stable vortex growth and before the vortex detaches. Edge undulation leads to a more turbulent vortex core and a faster vortex growth. The application of different approaches to recover the acting forces from PIV data lead to the conclusion, that the three-dimensionality of the turbulent vortex wake leads to both: a loss of out-of-plane vorticity and an underestimation of the kinetic energy in the vortex.

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Postprint §
DOI: 10.5445/IR/1000098018
Frei zugänglich ab 23.07.2020
Zugehörige Institution(en) am KIT Institut für Strömungsmechanik (ISTM)
Publikationstyp Proceedingsbeitrag
Jahr 2019
Sprache Englisch
Identifikator KITopen-ID: 1000098018
Erschienen in 13th International Symposium on Particle Image Velocimetry, July 22-24, 2019, Munich, Germany. Ed.: C. Kähler
Veranstaltung 13th International Symposium on Particle Image Velocimetery (ISPIV 2019), München, Deutschland, 22.07.2019 – 24.07.2019
Verlag Institute of Fluid Mechanics and Aerodynamics, Universität der Bundeswehr München, Neubiberg
Seiten 1357-1364
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