Analysis of non-harmonic excitation of synthetic jet actuators

0474965 - ÚT 2018 RIV CZ eng C - Konferenční příspěvek (zahraniční konf.)
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]
Grant CEP: GA ČR(CZ) GA16-16596S
Institucionální podpora: RVO:61388998
Klíčová slova: synthetic jet * synthetic jet actuator * momentum flux
Obor OECD: 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.
Trvalý link: http://hdl.handle.net/11104/0273587