Low-Amplitude Acoustic Modulation as a Tool for Controlling the Vortex Structures of the Turbulent Axisymmetric Air Jet

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985858%3A_____%2F25%3A00638854" target="_blank" >RIV/67985858:_____/25:00638854 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.cmff.hu/papers25/CMFF25_Conference_Proceedings.pdf" target="_blank" >https://www.cmff.hu/papers25/CMFF25_Conference_Proceedings.pdf</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Low-Amplitude Acoustic Modulation as a Tool for Controlling the Vortex Structures of the Turbulent Axisymmetric Air Jet

Popis výsledku v původním jazyce

The roll-up of vortex structures in turbulent jets can be influenced by low-amplitude modulations of the nozzle exit velocity. These modulations can be generated either by external low-amplitude oscillations or by self-sustaining oscillations inherent to the operation of specially designed nwhistler nozzles. The aim of the experimental investigations, mathematical modeling, and numerical simulations carried out as part of the nproject evaluation was to thoroughly investigate the characteristics and vortex dynamics of acoustically modulated and non-modulated nozzles. A major focus was on identifying effective methods to control vortex structures, as these play an important role in improving heat transfer processes. This paper presents the results of mathematical modeling and numerical simulations of free and impinging turbulent axisymmetric air jets, both unmodulated and modified by low-amplitude oscillations. The modeling results showed strong agreement with experimental findings confirming the ability to manipulate vortex structures in the jet by acoustically modulating the nozzle exit velocity. This study provides a basis for the development and optimization of technological processes using air jets, particularly in applications where improved heat ntransfer is critical.

Název v anglickém jazyce

Low-Amplitude Acoustic Modulation as a Tool for Controlling the Vortex Structures of the Turbulent Axisymmetric Air Jet

Popis výsledku anglicky

The roll-up of vortex structures in turbulent jets can be influenced by low-amplitude modulations of the nozzle exit velocity. These modulations can be generated either by external low-amplitude oscillations or by self-sustaining oscillations inherent to the operation of specially designed nwhistler nozzles. The aim of the experimental investigations, mathematical modeling, and numerical simulations carried out as part of the nproject evaluation was to thoroughly investigate the characteristics and vortex dynamics of acoustically modulated and non-modulated nozzles. A major focus was on identifying effective methods to control vortex structures, as these play an important role in improving heat transfer processes. This paper presents the results of mathematical modeling and numerical simulations of free and impinging turbulent axisymmetric air jets, both unmodulated and modified by low-amplitude oscillations. The modeling results showed strong agreement with experimental findings confirming the ability to manipulate vortex structures in the jet by acoustically modulating the nozzle exit velocity. This study provides a basis for the development and optimization of technological processes using air jets, particularly in applications where improved heat ntransfer is critical.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20402 - Chemical process engineering

Projekt

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Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název statě ve sborníku

Confeence Proceedings

ISBN

978-615-112-002-6

ISSN

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e-ISSN

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Počet stran výsledku

11

Strana od-do

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Název nakladatele

Budapest University of Technology and Economics

Místo vydání

Budapest

Místo konání akce

Budapest

Datum konání akce

26. 8. 2025

Typ akce podle státní příslušnosti

EUR - Evropská akce

Kód UT WoS článku

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