5th International Anatolian Energy Symposium AES2021 , Trabzon, Turkey, 24 - 25 March 2021, pp.115-121
In this study, the flow field characteristics of a synthetic jet driven by a half sinusoidal signal wave were carried
out experimentally and compared to a sinusoidal signal. Besides, the synthetic jet driven by the half sinusoidal
signal was studied with different amplitudes and duty cycles. To elucidate the effectiveness of the actuator, the
half sinusoidal signal wave was arranged with different offsets. Synthetic jet driving frequency and voltage were
defined as ƒ=4 Hz and E=5 Vpp respectively. To form a synthetic jet, also known as zero net mass flux jet, a
woofer type loudspeaker actuator and a cylindrical nozzle having D=34 mm outlet diameter were used.
Instantaneous and time-averaged jet velocities were acquired by using a hot-wire anemometer. Synthetic jet
velocity flow fields were measured in the different dimensionless axial distances (H/D). The increasing
amplitude of half sinusoidal signals generates tandem jets with different velocities where a jet with higher
velocity can reach the preceding jet. By measuring the instantaneous velocity time history along the jet axial
centerline, it was investigated whether the movements of the tandem jet would form a combined single jet
structure.