Original title: Synthetic Jet Characteristic Velocity Estimated nn The Basis of Momentum Flux Measurement
Authors: Kordík, Jozef ; Trávníček, Zdeněk
Document type: Papers
Conference/Event: Conference TOPICAL PROBLEMS OF FLUID MECHANICS 2018, Praha (CZ), 20180221
Year: 2018
Language: eng
Abstract: 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.
Keywords: momentum flux; synthetic jet; synthetic jet actuator
Project no.: GA16-16596S (CEP)
Funding provider: GA ČR
Host item entry: Topical problem of Fluid Mechanics 2018, ISBN 978-80-87012-65-9, ISSN 2336-5781

Institution: Institute of Thermomechanics AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: http://hdl.handle.net/11104/0285255

Permalink: http://www.nusl.cz/ntk/nusl-383505


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Research > Institutes ASCR > Institute of Thermomechanics
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