Investigation Of Flow Field Characteristics Of Synthetic Jet Driven By Half Sinusoidal Signal


Bayat M. Y. , Sarıoğlu M. , Akansu Y. E.

5th International Anatolian Energy Symposium AES2021 , Trabzon, Turkey, 24 - 25 March 2021, pp.115-121

  • Publication Type: Conference Paper / Full Text
  • City: Trabzon
  • Country: Turkey
  • Page Numbers: pp.115-121

Abstract

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.