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Impact of Turbulence Generators on Turbulent Characteristics and Structures

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    0471312 - ÚT 2018 RIV CZ eng C - Conference Paper (international conference)
    Kellnerová, Radka - Jurčáková, Klára - Jaňour, Zbyněk
    Impact of Turbulence Generators on Turbulent Characteristics and Structures.
    Topical Problems of Fluid Mechanics 2017. Prague: Institute of Thermomechanics AS CR, v. v. i., 2017 - (Šimurda, D.; Bodnár, T.), s. 185-194, č. článku 024. ISBN 978-80-87012-61-1. ISSN 2336-5781.
    [Topical Problems of Fluid Mechanics 2017. Prague (CZ), 15.02.2017-17.02.2017]
    R&D Projects: GA ČR GA15-18964S
    Institutional support: RVO:61388998
    Keywords : turbulence generator * wind channel * vorticity * quadrant analysis
    OECD category: Fluids and plasma physics (including surface physics)
    http://www.it.cas.cz/fm2015/im/admin/showfile/data/my/Papers/2017/24-TPFM2017.pdf

    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.

    Permanent Link: http://hdl.handle.net/11104/0273597

     
     
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