Laser Doppler vibrometry experiment on a piezo-driven slot synthetic jet in water

0436011 - ÚT 2016 RIV FR eng C - Konferenční příspěvek (zahraniční konf.)
Broučková, Zuzana - Vít, T. - Trávníček, Zdeněk
Laser Doppler vibrometry experiment on a piezo-driven slot synthetic jet in water.
EFM14 - EXPERIMENTAL FLUID MECHANICS 2014. Paris: E D P SCIENCES, 2015 - (Vít, T.; Dančová, P.), s. 71-77. EPJ Web of Conferences, 92. ISSN 2100-014X.
[Experimental Fluid Mechanics 2014. Český Krumlov (CZ), 18.11.2014-21.11.2014]
Grant CEP: GA ČR GA14-08888S
Institucionální podpora: RVO:61388998
Klíčová slova: synthetic jet * laser Doppler vibrometry * laser induced fluorescence
Kód oboru RIV: BJ - Termodynamika

The present study deals with a slot synthetic jet (SJ) issuing from an actuator into quiescent surroundings and driven by a piezoceramic transducer. The actuator slot width was 0.36 mm. The working fluid was water. The present experiments used flow visualization (a laser-induced fluorescence technique - LIF) and laser Doppler vibrometry methods (LDV). Flow visualization was used to identify SJ formation, to demonstrate its function, and to estimate SJ velocity. LDV was used to quantify diaphragm displacement and refine operating parameters. Phase averaging yielded a diaphragm deflection during the actuation period. Taking incompressibility and continuity into consideration, the velocity in the actuator slot and the Reynolds number of the SJ were evaluated as 0.21 m/s and 157, respectively. The present results confirmed a SJ actuator function at the resonance frequency of approximately 46 Hz, which corresponds closely with the theoretical evaluation. The LDV results corresponded closely with an estimation of SJ velocity by the visualization.
Trvalý link: http://hdl.handle.net/11104/0242220