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Communication Dans Un Congrès Année : 2019

Closed-loop drag reduction over a D-shaped body via Coanda actuation

Résumé

Up to 40% drag reduction was achieved for a D-shaped cylinder in an experiment with robust model-based closed-loop control. The flow is actuated with on-off jet slots blowing in the stream-wise direction over the top and bottom edge. These jets are deflected inward with Coanda surfaces, thus realizing drag reduction by aerodynamic boat tailing. The flow state is monitored with pressure sensors at the trailing surface. The pressure fluctuation level is found to be closely related to drag. Starting point for control design is an optimized open-loop control, with a Strouhal number of 0.33 and duty cycle of 50%. Successful closed-loop drag reduction was achieved, in terms of improving output stability and enhancing performance in term of settling time.
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Dates et versions

hal-02398700 , version 1 (07-12-2019)

Identifiants

  • HAL Id : hal-02398700 , version 1

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Tamir Shaqarin, Philipp Oswald, Richard Semaan, Bernd Noack. Closed-loop drag reduction over a D-shaped body via Coanda actuation. 5th Symposium on Fluid Structure-Sound Interactions and Control (FSSIC), Aug 2019, Minoa Palace - Resort, Chania, Crete island, Greece. ⟨hal-02398700⟩
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