Active decoupling of the axisymmetric body wake response to a pitching motion |
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Institution: | 1. Department of Mechanical Engineering, Florida Center for Advanced Aero-Propulsion, Florida State University, Tallahassee, FL32310, USA;2. Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL32611, USA;1. Institute of Vibration, Shock and Noise, Shanghai Jiao Tong University, Shanghai 200240, PR China;2. State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University, Shanghai 200240, PR China |
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Abstract: | Controlled interactions between fluidic actuators and the cross flow over the aft end of a wire-mounted axisymmetric wind tunnel bluff body model (ReD=2.3·105) are exploited for modification of the near wake dynamics, and the consequent global aerodynamic loads. Actuation is effected using an array of four aft-facing synthetic jet modules through narrow, azimuthally-segmented slots that are equally distributed around the perimeter of the tail end. The model is supported by eight wires, each including a miniature inline force transducer for measurements of the time-resolved tension. The model’s position is varied in a prescribed trajectory by synchronous activation of shape memory alloy (SMA) segments in each of the mounting wires, and the aerodynamic forces and moments are manipulated over a range of pitch attitude. The effectiveness of the flow control approach is demonstrated by decoupling of the wake response from the body’s pitch motion at a low pitch frequency (k=0.013). It is shown that, under the active control, the wake symmetry can be restored or its asymmetry can be amplified. |
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Keywords: | flow control axisymmetric body wake |
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