Synthetic Jet Characteristic Velocity Estimated nn The Basis of Momentum Flux Measurement

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388998%3A_____%2F18%3A00487328" target="_blank" >RIV/61388998:_____/18:00487328 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.14311/TPFM.2018.023" target="_blank" >http://dx.doi.org/10.14311/TPFM.2018.023</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.14311/TPFM.2018.023" target="_blank" >10.14311/TPFM.2018.023</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Synthetic Jet Characteristic Velocity Estimated nn The Basis of Momentum Flux Measurement

Popis výsledku v původním jazyce

The paper compares two methods of evaluation of synthetic jet characteristic velocity. The first method of the characteristic velocity estimation is based on a simple measurement of the synthetic jet momentum flux (the jet thrust) by means of precision scales. The second method is a standard one, it is based on spatial-temporal integration of the velocity profile at the synthetic jet actuator nozzle exit. The velocity profile was obtained here using hotwire measurements in air. Comparison of the methods is based on dimensionless stroke length of the synthetic jet. It is confirmed that the results of both methods are nearly the same for higher dimensionless stroke length. On the other hand, if the jet regime approaches to the synthetic jet criterion threshold (i.e. to the dimensionless stroke length of 0.5) the results of both methods diverge. Using the current results a correction is suggested for the momentum-flux-based method to match the standard one.

Název v anglickém jazyce

Synthetic Jet Characteristic Velocity Estimated nn The Basis of Momentum Flux Measurement

Popis výsledku anglicky

The paper compares two methods of evaluation of synthetic jet characteristic velocity. The first method of the characteristic velocity estimation is based on a simple measurement of the synthetic jet momentum flux (the jet thrust) by means of precision scales. The second method is a standard one, it is based on spatial-temporal integration of the velocity profile at the synthetic jet actuator nozzle exit. The velocity profile was obtained here using hotwire measurements in air. Comparison of the methods is based on dimensionless stroke length of the synthetic jet. It is confirmed that the results of both methods are nearly the same for higher dimensionless stroke length. On the other hand, if the jet regime approaches to the synthetic jet criterion threshold (i.e. to the dimensionless stroke length of 0.5) the results of both methods diverge. Using the current results a correction is suggested for the momentum-flux-based method to match the standard one.

Druh

D - Stať ve sborníku

CEP obor

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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

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

Rok uplatnění

2018

Kód důvěrnosti údajů

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

Název statě ve sborníku

Topical problem of Fluid Mechanics 2018

ISBN

978-80-87012-65-9

ISSN

2336-5781

e-ISSN

—

Počet stran výsledku

8

Strana od-do

175-182

Název nakladatele

Ústav termomechaniky AV ČR, v. v. i.

Místo vydání

Praha

Místo konání akce

Praha

Datum konání akce

21. 2. 2018

Typ akce podle státní příslušnosti

EUR - Evropská akce

Kód UT WoS článku

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