Non-harmonic excitation of synthetic jet actuators based on electrodynamic transducers

0492687 - ÚT 2019 RIV US eng J - Journal Article
Kordík, Jozef - Trávníček, Zdeněk
Non-harmonic excitation of synthetic jet actuators based on electrodynamic transducers.
International Journal of Heat and Fluid Flow. Roč. 73, October (2018), s. 154-162. ISSN 0142-727X. E-ISSN 1879-2278
R&D Projects: GA ČR(CZ) GA16-16596S
Institutional support: RVO:61388998
Keywords : synthetic jet * harmonic excitation * momentum flux
OECD category: Fluids and plasma physics (including surface physics)
Impact factor: 2.000, year: 2018
https://www.sciencedirect.com/science/article/pii/S0142727X18301449/pdfft?md5=3cc2360de61ad29d549b4debe0b8ccff&pid=1-s2.0-S0142727X18301449-main.pdf&download=true&isDTMRedir=true

An axisymmetric synthetic jet actuator based on a loudspeaker was tested experimentally. The actuator was driven by a voltage waveform, whose shape was derived from a pulse-width modulated signal. With the duty cycle and frequency of the excitation voltage varied at a constant electrical input power level and fixed nozzle diameter, the momentum flux of the jet (the jet thrust) was measured using precision scales. The maximum of the measured momentum flux was found at the optimum driving frequency and the duty cycle. This experiment was repeated for several input power levels and nozzle diameters, and the resultant optimal driving configurations were compared with adequate results for a harmonically driven actuator with identical geometry. Based on a newly introduced dimensionless nozzle diameter, a criterion was found that states conditions under which it is advantageous to use the suggested non-harmonic excitation.
Permanent Link: http://hdl.handle.net/11104/0286811