Abstract
Duty cycle modulation of the alternate blowing from two opposite facing plasma actuators on the leeward surface near the apex of a cone having semi-apex angle of 10° to control the mean lateral force, moment and the flow control mechanisms are presented. The pressure distributions over the cone forebody are measured using steady pressure-tappings. The flowfields are visualized by a two-dimensional particle image velocimetry (PIV). The experiments are performed at 5m/s wind speed with Reynolds number 40,000 based on the cone base diameter. The opposite bi-stable vortex patterns appear when the port or starboard actuator is activated while the other is kept off during the test. The phase-locked (locked to the plasma duty cycle) averaged vertex cores controlled by the duty-cycled plasma actuation are periodic and vary around the position of the ensemble averaged vertex cores.
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