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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20304 - Aerospace engineering

Projekt

<a href="/cs/project/GC21-26232J" target="_blank" >GC21-26232J: Zvyšování přestupu tepla a hmoty v nestacionárních tekutinových proudech – využití vlivu hystereze, bistability a intermitence</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2024

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Visualization

ISSN

1343-8875

e-ISSN

1875-8975

Svazek periodika

27

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

15

Strana od-do

291-305

Kód UT WoS článku

001184462100001

EID výsledku v databázi Scopus

2-s2.0-85187934161