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Impact of Turbulence Generators on Turbulent Characteristics and Structures

SYSNO ASEP	0471312
Document Type	C - Proceedings Paper (int. conf.)
R&D Document Type	Conference Paper
Title	Impact of Turbulence Generators on Turbulent Characteristics and Structures
Author(s)	Kellnerová, Radka (UT-L)_{RID, ORCID} Jurčáková, Klára (UT-L)_{RID, ORCID} Jaňour, Zbyněk (UT-L)_{RID, ORCID}
Article number	024
Source Title	Topical Problems of Fluid Mechanics 2017. - Prague : Institute of Thermomechanics AS CR, v. v. i., 2017 / Šimurda D. ; Bodnár T. - ISSN 2336-5781 - ISBN 978-80-87012-61-1
Pages	s. 185-194
Number of pages	10 s.
Publication form	Print - P
Action	Topical Problems of Fluid Mechanics 2017
Event date	15.02.2017 - 17.02.2017
VEvent location	Prague
Country	CZ - Czech Republic
Event type	WRD
Language	eng - English
Country	CZ - Czech Republic
Keywords	turbulence generator ; wind channel ; vorticity ; quadrant analysis
Subject RIV	BK - Fluid Dynamics
OECD category	Fluids and plasma physics (including surface physics)
R&D Projects	GA15-18964S GA ČR - Czech Science Foundation (CSF)
Institutional support	UT-L - RVO:61388998
DOI	10.14311/TPFM.2017.024
Annotation	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.
Workplace	Institute of Thermomechanics
Contact	Marie Kajprová, kajprova@it.cas.cz, Tel.: 266 053 154 ; Jana Lahovská, jaja@it.cas.cz, Tel.: 266 053 823
Year of Publishing	2018

Number of the records: 1