THE EFFECT OF INTERNAL GEOMETRY ON THE JET OSCILLATION OF A FEEDBACK CONTROLLED FLUIDIC OSCILLATOR

摘要

Fluidic oscillators which can induce self-sustained oscillatory jet under steady supply are a promising tool for aerodynamic flow control. In this paper, the effect of the actuator feedback channel width, inner diverging angle and thickness on the oscillation of the emanating sweeping jet is investigated under various supply flow rates. The influence of these internal dimensions is found to vary with different inlet velocities. The oscillation frequency reduces with the increase of the feedback channel width under higher inlet velocities while the effect of the thickness is more obvious under lower inlet velocities. The results presented could be used as a guideline for the effective design of such oscillators.