Abstract
This paper describes a detailed study of a synthetic jet governing flow field. The synthetic jet, known as a zero net mass-flux jet, is generated by a vibrating diaphragm to oscillate flow through a small orifice. The synthetic actuator consists of the orifice and cavity installed the PZT disk of 31.2mm diameter. The test is conducted in variable input voltages and frequencies to PZT disk. The time-mean velocity and phase-locked velocity is measured by Laser Doppler Velocimeter. In the test condition of the input voltage of AC 30.0V at the actuation frequency of 990Hz, the time-mean data show the entrainment from vortexes increases the mass flow with the high blowing velocity away the orifice exit. Phase-locked velocity vector and vorticity fields reveal the periodic vortexes behavior, ejecting from the orifice, extending itself with loosing the coherent structures, and diminishing in the ambient air.
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