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THE INFLUENCE OF FREQUENCY-LIMITED AND NOISE-CONTAMINATED SENSING ON REACTIVE TURBULENCE CONTROL SCHEMES

Alexander Stroh
Institute of Fluid Mechanics, Karlsruhe Institute of Technology, Karlsruhe, 76131, Germany

Bettina Frohnapfel
International Research Training Group Darmstadt-Tokyo on Mathematical Fluid Dynamics; Institut fur Stromungsmechanik, Karlsruher Institut fur Technologie, Kaiserstr. 10, Geb. 10.23, 76131 Karlsruhe, Germany

Yosuke Hasegawa
Institute of Industrial Science, The University of Tokyo, Komaba 4-6-1, Meguro-ku, Tokyo 153-8505, Japan; Center of Smart Interfaces Technical University Darmstadt Petersenstr. 32, 64287 Darmstadt, Germany

Nobuhide Kasagi
Center for Research and Development Strategy, Japan Science and Technology Agency; Department of Mechanical Engineering, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan

Cameron Tropea
Technische Universität Darmstadt, Institute of Fluid Mechanics and Aerodynamics, Center of Smart Interfaces, International Research Training Group Darmstadt-Tokyo on Mathematical Fluid Dynamics, Germany

Abstract

Existing reactive turbulence control schemes for skin friction drag reduction are investigated to see how frequencylimited and noise-contaminated sensing will influence their control performance. It is found that the sensing frequency can be reduced substantially when the control scheme is modified to account for the convection speed of the measured sensor signal. Noisy sensor signals are shown to strongly affect the achievable net energy saving rate and energy gain at high sensing frequencies, while their influence is weaker for reduced sensing frequencies. These results also hold for increased Reynolds number where the performance of the control scheme is generally reduced.