Annular impinging jets controlled by synthetic jets inducing a swirling flow character

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388998%3A_____%2F24%3A00586199" target="_blank" >RIV/61388998:_____/24:00586199 - isvavai.cz</a>
Result on the web
<a href="https://link.springer.com/article/10.1007/s12650-024-00972-4" target="_blank" >https://link.springer.com/article/10.1007/s12650-024-00972-4</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1007/s12650-024-00972-4" target="_blank" >10.1007/s12650-024-00972-4</a>

Result language
angličtina
Original language name
Annular impinging jets controlled by synthetic jets inducing a swirling flow character
Original language description
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.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
20304 - Aerospace engineering

Project
<a href="/en/project/GC21-26232J" target="_blank" >GC21-26232J: Heat and mass transfer enhancement in unsteady jet flows - utilization of effects of hysteresis, bistability and intermittency</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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