View Video Presentation: https://doi.org/10.2514/6.2021-1304.vid

The aim of this study is to investigate the efficacy of upper-surface trailing-edge blowing during flap actuation using phase-locked PIV. A modified NACA0012 wing with two different flap configurations, conventional flap and dual radius flap, are considered in this study. Preliminary numerical simulations and experimental measurements have been carried for various angles of attack, flap deflection angles, Reynolds numbers and blowing intensities to investigate the steady state flow physics for both wing configurations. Particle image velocimetry is used with the snapshot proper orthogonal decomposition method to understand various dominant structures associated with the mixing flows. Steady state numerical and experimental results have shown good agreement with previous studies. Phase-locked PIV measurements are carried out for various actuation frequencies and blowing intensities. Results show that as the flap actuation frequency increases higher blowing intensities are required to keep the flow attached.