The predominant effect of stroke length on velocity profiles at the exit of axisymmetric synthetic jet actuators

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388998%3A_____%2F17%3A00475946" target="_blank" >RIV/61388998:_____/17:00475946 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1016/j.ijheatfluidflow.2017.06.004" target="_blank" >http://dx.doi.org/10.1016/j.ijheatfluidflow.2017.06.004</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.ijheatfluidflow.2017.06.004" target="_blank" >10.1016/j.ijheatfluidflow.2017.06.004</a>

Result language
angličtina
Original language name
The predominant effect of stroke length on velocity profiles at the exit of axisymmetric synthetic jet actuators
Original language description
This paper addresses the effect of stroke length on velocity profiles at the exit of axisymmetric synthetic jet actuators. An actuator with a “short-orifice” nozzle geometry was studied (the length of the sharp-edged orifice nozzle being always shorter than the stroke length). The investigation was carried out using hot-wire experiments and numerical approaches in the range of the Reynolds number from 400 to 5600 and a dimensionless stroke length from 1.5 to 86 (i.e. the Stokes number was from 16 to 102). To quantify the velocity profiles at the actuator exit, the ratio of the two characteristic velocities was used. The former one was evaluated as the time- and spatially-averaged orifice velocity and the latter as the time-mean centerline velocity. It was found that this average-to-centerline velocity ratio depends mainly on the dimensionless stroke length, with a minor dependence on the Reynolds number. An approximation function of this predominant relationship has been proposed. The results of both experimental and numerical approaches are in reasonable agreement showing variation of average-to-centerline velocity ratio in the range of 0.7–1.3.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10305 - Fluids and plasma physics (including surface physics)

Project
<a href="/en/project/GA16-16596S" target="_blank" >GA16-16596S: Optimization of pulsatile jet actuation in fluid mechanics</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2017
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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