Název:	The structure of turbulent flow behind the NACA 0012 airfoil at high angles of attack and low Reynolds number
Autoři:	Yanovych, Vitalii Duda, Daniel Uruba, Václav Kosiak, Pavlo
Citace zdrojového dokumentu:	YANOVYCH, V. DUDA, D. URUBA, V. KOSIAK, P. The structure of turbulent flow behind the NACA 0012 airfoil at high angles of attack and low Reynolds number. In 20th Conference on Power System Engineering. Pilsen: EDP Sciences, 2021. s. 1-10. ISBN: neuvedeno , ISSN: 2261-236X
Datum vydání:	2021
Nakladatel:	EDP Sciences
Typ dokumentu:	konferenční příspěvek ConferenceObject
URI:	http://hdl.handle.net/11025/47311
ISSN:	2261-236X
Klíčová slova v dalším jazyce:	NACA 0012;HWA;wake;turbulence
Abstrakt v dalším jazyce:	This paper shows the results of a study of the turbulent structure behind the NACA 0012 airfoil. During the experiment, the flow velocity was 20 m·s−1. That corresponds the Reynolds number 1.3·105. The point behind the trailing edge was chosen for experimental studies. Measurements were performed at six angles of attack α = 0°, 15°, 30°, 45°, 60°, 75° and various cases of positioning the measuring section. Namely at a constant crosssection and a constant distance behind the airfoil. The NetScanner pressure system and hot-wire technique were used for experimental studies. The obtained data allowed us to investigate the wake topology. The average velocity and standard deviation distributions are clearly grouped depending on the angle of attack. Thus, flowing around the airfoil is better up to α ≤15°. Distributions by power density and dissipation spectra also have a similar grouping tendency. Finally, we investigated the turbulent structure according to the research program. We found that at α ≥45°, depending on the measurement case, there is a clear difference in the distribution of standard deviation, Eulerian length scale, Taylor micro-scale, and Reynolds number based on the Taylor micro-scale. The obtained values at the constant distance, in contrast to the constant cross-section, are reduced.
Práva:	© authors
Vyskytuje se v kolekcích:	Konferenční příspěvky / Conference papers (CEV) Konferenční příspěvky / Conference papers (KKE) OBD

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