Control of a Round Jet Intermittency and Transition to Turbulence by Means of an Annular Synthetic Jet

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388998%3A_____%2F21%3A00544701" target="_blank" >RIV/61388998:_____/21:00544701 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.mdpi.com/2076-0825/10/8/185" target="_blank" >https://www.mdpi.com/2076-0825/10/8/185</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3390/act10080185" target="_blank" >10.3390/act10080185</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Control of a Round Jet Intermittency and Transition to Turbulence by Means of an Annular Synthetic Jet

Popis výsledku v původním jazyce

This paper deals with active control of a continuous jet issuing from a long pipe nozzle by means of a concentrically placed annular synthetic jet. The experiments in air cover regimes of laminar, transitional, and turbulent main jet flows (Reynolds number ranges 1082–5181). The velocity profiles (time-mean and fluctuation components) of unforced and forced jets were measured using hot-wire anemometry. Six flow regimes are distinguished, and their parameter map is proposed. The possibility of turbulence reduction by forcing in transitional jets is demonstrated, and the maximal effect is revealed at Re = 2555, where the ratio of the turbulence intensities of the forced and unforced jets is decreased up to 0.45.

Název v anglickém jazyce

Control of a Round Jet Intermittency and Transition to Turbulence by Means of an Annular Synthetic Jet

Popis výsledku anglicky

This paper deals with active control of a continuous jet issuing from a long pipe nozzle by means of a concentrically placed annular synthetic jet. The experiments in air cover regimes of laminar, transitional, and turbulent main jet flows (Reynolds number ranges 1082–5181). The velocity profiles (time-mean and fluctuation components) of unforced and forced jets were measured using hot-wire anemometry. Six flow regimes are distinguished, and their parameter map is proposed. The possibility of turbulence reduction by forcing in transitional jets is demonstrated, and the maximal effect is revealed at Re = 2555, where the ratio of the turbulence intensities of the forced and unforced jets is decreased up to 0.45.

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

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2021

Kód důvěrnosti údajů

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

Název periodika

Actuators

ISSN

2076-0825

e-ISSN

2076-0825

Svazek periodika

10

Číslo periodika v rámci svazku

8

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

24

Strana od-do

185

Kód UT WoS článku

000688740800001

EID výsledku v databázi Scopus

2-s2.0-85112362151