Yaw Control of a Moving Axisymmetric Body using Synthetic Jets

Synthetic jet actuators are utilized on a nominally 'free' yawing axisymmetric model to induce localized flow attachment over the body’s aft end and thereby alter the dynamic model orientation. The model is supported by a vertical thin steel wire that passes through the model that undergoes natural oscillatory response to the oncoming flow. Hybrid fluidic actuation is effected using two independently driven aft-facing jet actuators that emanate from narrow, azimuthally-segmented slots, centered symmetrically on the opposite ends of the yawing plane, and placed on a circular tail end that extends into a Coanda surface. The body motion response is measured using a laser vibrometer, and the aft coupled body/flow dynamics is characterized using planar PIV. Continuous actuation schemes, independent of model motion, and the respective aerodynamic responses are investigated with 'open loop' fluidic control. In addition, a PID controller is developed to effect 'closed loop' fluidic control with optimally timed synthetic jet operation dependent on model motion. Fluidic actuation demonstrates up to 60% suppression of natural yaw oscillations, and can impose directional preference with open loop control. The closed loop control results in more prominent yaw oscillation suppression of about 90%, directional preference, or oscillation amplification, displaying a large potential for directional control authority of free flight aerodynamic bodies.

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