Analysis of non-harmonic excitation of synthetic jet actuators

0474965 - ÚT 2018 RIV CZ eng C - Conference Paper (international conference)
Kordík, Jozef - Trávníček, Zdeněk
Analysis of non-harmonic excitation of synthetic jet actuators.
31st SYMPOSIUM ON ANEMOMETRY PROCEEDINGS. Prague: Institute of Hydrodynamics CAS, v. v. i., 2017 - (Chára, Z.; Klaboch, L.), s. 43-51. ISBN 978-80-87117-16-3.
[Symposium on anemometry /31./. Holany-Litice (CZ), 30.05.2017-31.05.2017]
R&D Projects: GA ČR(CZ) GA16-16596S
Institutional support: RVO:61388998
Keywords : synthetic jet * synthetic jet actuator * momentum flux
OECD category: Fluids and plasma physics (including surface physics)

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. While the duty cycle and frequency of the excitation signal were varied the outlet velocities were measured by a hot-wire probe. Integral quantities such as characteristic velocity, momentum flux, and kinetic energy flux were evaluated from the outlet velocities. Their maxima were located as functions of frequency and the duty cycle. The found maximal values were compared with results obtained for harmonic excitation. The highest improvement (about 18%) was achieved for kinetic energy flux.
Permanent Link: http://hdl.handle.net/11104/0273587