Novel plasma actuator for mitigation of dynamic stall

Abstract

A novel plasma actuator, the Linear Counter-flow using a Point Embedded Electrode (LCPEE), is developed for the prevention of dynamic stall for a sinusoidal pitching movement between α = 4° and α = 18°. The LCPEE is implemented on a NACA0012 airfoil at a Reynolds Number of Rec = 2 × 105 and reduced frequency of k = π/16. For prior investigations using a standard linear actuator, the exposed electrode introduces perturbations passively which delay dynamic stall when the actuator is off. For the LCPEE actuator, when turned off, there is minor passive delay. When the LCPEE is turned on at Stf = 50, dynamic stall is prevented for the motion. The LCPEE actuator is also tested for the same sinusoidal motion but between α = 6° and α = 20°. Four cases are considered for the higher range of motion: actuator off, actuator on Stf = 50 sinusoidal input waveform, actuator on Stf = 50 triangular input waveform, and actuator on Stf = 100 sinusoidal input waveform. For actuator on Stf = 100 sinusoidal input waveform case, no flow reversal is present.