Data Mining of Experimental Data on Separation Control of the Flows Over NACA0015 and Ishii Airfoils Using Dielectric Barrier Discharge Plasma Actuator

Analysis of the experimental results of separation control with a dielectric barrier discharge plasma actuator over a NACA0015 airfoil and an Ishii airfoil, which is practical airfoil and gains better aerodynamic performance than NACA0015 airfoil at low Reynolds number, is conducted to investigate the relationship between the parameters (i.e. nondimensional burst frequency: F⁺, input voltage: V_pp, angle of attack: AoA) and the improvement of the aerodynamic performance. Time-averaged pressure distributions are measured at Reynolds number of 62,000 around the airfoils. In this study, scatter plot matrix (SPM) is used as the data mining technique to extract the correlation between parameters. Results indicate that for both NACA0015 and Ishii airfoils, F⁺ = 6 and 1 are effective for low and high AoA, respectively. Also SPM plots show that the pressure coefficient at the trailing edge and lift-to-drag ratio (L/D) are well related each other.