Název:
Impact of Turbulence Generators on Turbulent Characteristics and Structures
Autoři:
Kellnerová, Radka ; Jurčáková, Klára ; Jaňour, Zbyněk Typ dokumentu: Příspěvky z konference Konference/Akce: Topical Problems of Fluid Mechanics 2017, Prague (CZ), 20170215
Rok:
2017
Jazyk:
eng
Abstrakt: 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
Klíčová slova:
quadrant analysis; turbulence generator; vorticity; wind channel Číslo projektu: GA15-18964S (CEP) Poskytovatel projektu: GA ČR Zdrojový dokument: Topical Problems of Fluid Mechanics 2017, ISBN 978-80-87012-61-1, ISSN 2336-5781