Abstract
Feedback control of periodic flow separation on a NACA0024 airfoil has been investigated by using dielectric barrier discharge (DBD) plasma actuators and fiber Bragg grating (FBG) sensors under oscillation of the test section wall. A tangential jet is generated from sheet-type DBD plasma actuators placed at the leading edge of the airfoil. An FBG flow sensor is mounted at the root of a cantilever beam, which detects the vibrations of the cantilever tip by wake flow around the trailing edge. Flow separation can be detected by the standard deviation of Bragg wavelength (B’). A demonstration of flow separation control was conducted successfully under periodic flow separation by a feedback algorithm using a threshold level of B’ = 0.006 at Re = 5.3×10 4 and showed that the flow separation can be mitigated by more than 20%. In addition, string-type DBD plasma actuators were developed to apply DBD plasma actuators on metallic and three dimensional surfaces and their induced flow properties were investigated by PIV.
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