Abstract
A feedback control system for mitigating periodic flow separation on the NACA0024 airfoil was constructed by using dielectric barrier discharge plasma actuators (DBD-PA) and fiber Bragg grating flow sensors (FBG-FS). A tangential jet is generated from the DBD-PA placed at the leading edge of the airfoil. An FBG-FS is mounted near the root of a cantilever beam, which detects the vibrations of the cantilever tip forced by wake flow around the trailing edge. The TTL signal to control a HV-RF power supply was output when standard deviations of Bragg wavelength fluctuations (λ_B') are larger than a threshold value, γ= 0.006. The durations of flow separation (λ_B' > 0.006) under periodic wall oscillation were significantly reduced by the feedback control.
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