Experimental study on velocity characteristics of synthetic jet actuator

Measurements of the velocity field in a synthetic jet emanating from a special excited speaker are conducted by hot-wire anemometer. The effect of excitation frequency, power, waveforms (sine wave, triangle wave, square wave), and spatial locations are examined. The results show that time-averaged velocity and maximum velocity are up to 42.5 m/s and 117 m/s, respectively. The velocity of synthetic jet depends on excitation frequency strongly. There are three resonance frequencies (750 Hz, 1600 Hz, 2700 Hz) and the velocity diminishes sharply when the excitation frequency is deviated from the resonance frequencies.