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- W2024532703 abstract "The response of a zero-pressure-gradient laminar boundary layer to forcing by a spanwise array of plasma actuators is investigated experimentally. The plasma actuators used in this study are designed to produce counter-rotating vortex pairs in a spanwise periodic arrangement inside the boundary layer. It was demonstrated by Hanson et al., in related studies, that this plasma actuator array can be successfully used to control the transient growth instability occurring in a Blasius boundary layer. However, it was also demonstrated that the control effectiveness could be greatly affected by the actuator array geometry, which affects the modal content and energy distribution of the resulting disturbance. The focus of the present work is on studying the effect of excitation signal parameters, including the driving frequency and voltage, on the disturbance introduced by the plasma actuators. It is demonstrated that the disturbance energy increases with increasing frequency and voltage, consistent with previous studies of the thrust force or induced velocity from simpler actuator geometries. A crucial finding of the present study is that the individual modes produced by the actuator array are not affected in the same proportional manner by varying the voltage. The control disturbance approached a pure spanwise-harmonic disturbance for increasing voltage. In contrast, the excitation frequency did not have a discernible effect on the relative magnitude of each mode produced by the actuator array. These results highlight the complexity of the response of the boundary layer to the various actuation parameters and have critical implications for the practical integration of these actuators as part of a closed-loop control system." @default.
- W2024532703 created "2016-06-24" @default.
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- W2024532703 date "2010-01-04" @default.
- W2024532703 modified "2023-09-25" @default.
- W2024532703 title "Effect of Plasma Actuator Excitation for Controlling Bypass Transition in Boundary Layers" @default.
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- W2024532703 doi "https://doi.org/10.2514/6.2010-1091" @default.
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