Original title: Impact of Turbulence Generators on Turbulent Characteristics and Structures
Authors: Kellnerová, Radka ; Jurčáková, Klára ; Jaňour, Zbyněk
Document type: Papers
Conference/Event: Topical Problems of Fluid Mechanics 2017, Prague (CZ), 20170215
Year: 2017
Language: eng
Abstract: The turbulent generators are routinely used to produce very turbulent flows. Special type of vertically slenderize spires are applied to enhance turbulent diffusion from the surface upwards in order to increase the boundary layer depth. This paper studies the influence of variable upstream distance of generators on formation of both vortical and non-vortical organized structures within a test section. The 2-component 2-dimensional time-resolved particle image velocimetry measurement of the flow was performed in the wind channel with very rough surface. Intermittent flow dynamics was evaluated by means of higher order moments, vorticity, quadrant and wavelet analysis. The downstream evolution of the flow suggests that equilibrium between roughness- and spires-produced turbulence was reached at the distance of 7 spires height.\n
Keywords: quadrant analysis; turbulence generator; vorticity; wind channel
Project no.: GA15-18964S (CEP)
Funding provider: GA ČR
Host item entry: Topical Problems of Fluid Mechanics 2017, ISBN 978-80-87012-61-1, ISSN 2336-5781

Institution: Institute of Thermomechanics AS ČR (web)
Document availability information: Fulltext is available at external website.
External URL: http://www.it.cas.cz/fm2015/im/admin/showfile/data/my/Papers/2017/24-TPFM2017.pdf
Original record: http://hdl.handle.net/11104/0273597

Permalink: http://www.nusl.cz/ntk/nusl-363515


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