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An experimental study exploring the effective angle of attack oscillation amplitude on pitching and plunging flat plates is presented, as an extension of previous studies on pitching-plunging flat plate airfoils with harmonic effective angle of attack history. We consider the effect of reduced frequency and plunge motion amplitude. Two sets of test cases are studied: a shallow dynamic stall (-6°<αeff<22°), and a deep dynamic stall (-2.35°< αeff <13.65°). Force measurements are shown, and PIV data is presented for the shallow stall cases. Results show that for the shallow stall cases, the LEVs are significantly smaller in size than for the deep stall cases reported in literature. The force measurement results show significant impact of unsteady effects on the force time history, particularly for the more aggressive motions. Shallow stall cases delay the lift force history by almost a quarter cycle. In addition, significant lift generation is observed in the shallow cases given the narrow range of αeff used. Non-circulatory effects or rotation rate effects appear to be more dominant than LEV in force generation for the shallow stall cases.

Influence of Effective Angle of Attack Oscillation Amplitude on Force Generation by Pitching-Plunging Flat Plates