In-flight active wave cancelation with delayed-x-LMS control algorithm in a laminar boundary layer
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This manuscript demonstrates the first successful application of the delayed-x-LMS (dxLMS) control algorithm for TS-wave cancelation. Active wave cancelation of two-dimensional broadband Tollmien–Schlichting (TS) disturbances is performed with a single DBD plasma actuator. The experiments are conducted in flight on the pressure side of a laminar flow wing glove, mounted on a manned glider. The stability properties of the controller are investigated in detail with experimental flight data, DNS and stability analysis of the boundary layer. Finally, a model-free approach for dxLMS operation is introduced to operate the controller as a ‘black-box’ system, which automatically adjusts the controller settings based on a group speed measurement of the disturbance wave packets. The modified dxLMS controller is operated without a model and is able to adapt to varying conditions that may occur during flight in atmosphere.
KeywordsDirect Numerical Simulation Little Mean Square Laminar Boundary Layer Flight Speed Finite Impulse Response Filter
This work was supported by the German research foundation (DFG) under the Grant No.GR3524/4-1. Simulations have been performed at the National Supercomputer Centre (NSC) with computer time granted by the Swedish National Infrastructure for Computing (SNIC). We also wish to thank Jens Rohlfing from Fraunhofer LBF (Darmstadt) for the fruitful discussions. Finally we appreciate the support of our student and flight test pilot Tobias Hofmann.
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