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Annular impinging jets controlled by synthetic jets inducing a swirling flow character
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SYSNO ASEP 0586199 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Annular impinging jets controlled by synthetic jets inducing a swirling flow character Author(s) Devani, Yogendrasasidhar (UT-L) RID, ORCID
Antošová, Zuzana (UT-L) ORCID, RID
Trávníček, Zdeněk (UT-L) RID, ORCIDNumber of authors 3 Source Title Journal of Visualization. - : Springer - ISSN 1343-8875
Roč. 27, č. 3 (2024), s. 291-305Number of pages 15 s. Publication form Online - E Language eng - English Country NL - Netherlands Keywords annular jet ; impinging jet ; hysteresis ; flow control ; swirling flow ; synthetic jet Subject RIV JU - Aeronautics, Aerodynamics, Aircrafts OECD category Aerospace engineering R&D Projects GC21-26232J GA ČR - Czech Science Foundation (CSF) GC21-26232J GA ČR - Czech Science Foundation (CSF) Method of publishing Open access Institutional support UT-L - RVO:61388998 UT WOS 001184462100001 EID SCOPUS 85187934161 DOI https://doi.org/10.1007/s12650-024-00972-4 Annotation Experimental research was conducted on an annular air jet. The active flow control was introduced by means of tangentially arranged synthetic jets. Flow visualization and measurements of the flow velocity and stagnation pressure on an impingement wall were performed. Tests were carried out with Reynolds numbers ranging from 4000 to 10,000 (evaluated from the outer exit diameter of the annular nozzle). Bistability and hysteretic effects were revealed, because two alternative flow field patterns (A and B) were identified under the same boundary conditions. In the A pattern, a small recirculation area (bubble) of separated flow was attached to the nozzle centerbody. In the B pattern, a large recirculation area of separated flow bridged the entire nozzle-to-wall distance. The effect of the Reynolds number was evaluated: the hysteresis and bistability were not observed for Re C 9000. Concerning the effect of flow control, it was concluded that a moderate swirling effect can effectively suppress the hysteresis and bistability. 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 2025 Electronic address https://link.springer.com/article/10.1007/s12650-024-00972-4
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