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Triple-input/single-output extremum-seeking control system for jet mixing optimization


An Extremum Seeking (ES) closed-loop control system for simultaneous adaptation of three control commands is proposed employing the Extended Kalman Filter (EKF) algorithm. This control optimizes near-field jet mixing in an experiment. The main jet is injected by a single pulsed radially oriented minijet. This minijet is controlled by an electromagnetic valve with high frequency and a mass flow controller. The flow is investigated with hot-wires and flow visualization measurements. The Reynolds numbers ReD based on the jet exit diameter D and the exit velocity Uj are 5733, 8000, and 13333. This investigation has three steps: algorithm development, open-loop actuation and closed-loop control. The open loop results reveal that the three actuation parameters (mass flow ratio Cm, actuation frequency fa and duty cycle α) can affect the jet mixing enhancement significantly. Subsequently, these three parameters are adapted in the closed-loop system to achieve the optimal velocity decay K in an unsupervised manner. This method is robust when ReD is varied in the investigated range. This technique converges for different initial control parameters. The study reveals that nearly constant maximum K is achieved for all investigated jet exit Reynolds numbers ReD. This behavior indicates that the optimal control effect is independent from Reynolds number within the considered interval.
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hal-02398693 , version 1 (07-12-2019)


  • HAL Id : hal-02398693 , version 1


Dewei Fan, Yu Zhou, Bernd Noack. Triple-input/single-output extremum-seeking control system for jet mixing optimization. 5th Symposium on Fluid Structure-Sound Interactions and Control, Aug 2019, Minoa Palace - Resort, Chania, Crete island, Greece. pp.27 - 30. ⟨hal-02398693⟩
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