0586199 - ÚT 2025 RIV NL eng J - Journal Article
Devani, Yogendrasasidhar - Antošová, Zuzana - Trávníček, Zdeněk
Annular impinging jets controlled by synthetic jets inducing a swirling flow character.
Journal of Visualization. Roč. 27, č. 3 (2024), s. 291-305. ISSN 1343-8875. E-ISSN 1875-8975
R&D Projects: GA ČR(CZ) GC21-26232J; GA ČR(CZ) GC21-26232J
Institutional support: RVO:61388998
Keywords : annular jet * impinging jet * hysteresis * flow control * swirling flow * synthetic jet
OECD category: Aerospace engineering
Impact factor: 1.7, year: 2023 ; AIS: 0.436, rok: 2023
Method of publishing: Open access
Result website:
https://link.springer.com/article/10.1007/s12650-024-00972-4DOI: https://doi.org/10.1007/s12650-024-00972-4

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.
Permanent Link: https://hdl.handle.net/11104/0354221