Integral Quantities of Axisymmetric Synthetic Jets Evaluated from a Direct Jet Thrust Measurement

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388998%3A_____%2F19%3A00508043" target="_blank" >RIV/61388998:_____/19:00508043 - isvavai.cz</a>

Výsledek na webu

<a href="https://link.springer.com/article/10.1007%2Fs10494-019-00042-y" target="_blank" >https://link.springer.com/article/10.1007%2Fs10494-019-00042-y</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s10494-019-00042-y" target="_blank" >10.1007/s10494-019-00042-y</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Integral Quantities of Axisymmetric Synthetic Jets Evaluated from a Direct Jet Thrust Measurement

Popis výsledku v původním jazyce

This paper proposes a relatively simple and user-friendly experimental method for evaluating synthetic jet (SJ) characteristic velocity and fluxes of time-mean momentum and kinetic energy. The proposed method is based on the direct measurement of the SJ thrust by means of precision scales. The measurements were performed over a large range of Reynolds and Stokes numbers. The Reynolds number was between 1600 and 7100, and the Stokes number was between 15.4 and 202. To correlate the obtained results, hot-wire measurements of the velocity profiles were used and spatial-temporal integration of the hot-wire data was performed. To obtain the integral quantities, the correlations between the thrust and hot-wire results were used. Despite the relative simplicity of the proposed method, it yielded a very good evaluation of the characteristic velocity and fluxes of time-mean momentum and kinetic energy. The study was mostly focused on SJs with moderate and high stroke lengths (larger than five diameters of the orifice). The experimental data were within ±3.4% of the proposed correlation. For small stroke lengths (i.e. below five orifice diameters), the maximum deviation was within ±5.4%.

Název v anglickém jazyce

Integral Quantities of Axisymmetric Synthetic Jets Evaluated from a Direct Jet Thrust Measurement

Popis výsledku anglicky

This paper proposes a relatively simple and user-friendly experimental method for evaluating synthetic jet (SJ) characteristic velocity and fluxes of time-mean momentum and kinetic energy. The proposed method is based on the direct measurement of the SJ thrust by means of precision scales. The measurements were performed over a large range of Reynolds and Stokes numbers. The Reynolds number was between 1600 and 7100, and the Stokes number was between 15.4 and 202. To correlate the obtained results, hot-wire measurements of the velocity profiles were used and spatial-temporal integration of the hot-wire data was performed. To obtain the integral quantities, the correlations between the thrust and hot-wire results were used. Despite the relative simplicity of the proposed method, it yielded a very good evaluation of the characteristic velocity and fluxes of time-mean momentum and kinetic energy. The study was mostly focused on SJs with moderate and high stroke lengths (larger than five diameters of the orifice). The experimental data were within ±3.4% of the proposed correlation. For small stroke lengths (i.e. below five orifice diameters), the maximum deviation was within ±5.4%.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10305 - Fluids and plasma physics (including surface physics)

Projekt

<a href="/cs/project/GA16-16596S" target="_blank" >GA16-16596S: Optimalizace generování pulzujících proudů v mechanice tekutin</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název periodika

Flow Turbulence and Combustion

ISSN

1386-6184

e-ISSN

—

Svazek periodika

103

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

18

Strana od-do

827-844

Kód UT WoS článku

000483758600011

EID výsledku v databázi Scopus

2-s2.0-85067248919