A novel dielectric barrier discharge plasma actuator configuration for flow control is employed on open cavities to evaluate the potential for aeroacoustic tonal noise reduction. Instead of a planar configuration, the actuator is designed around the cavity opening edges. The investigation focuses on its effectiveness in terms of tonal noise suppression and the associated fluid dynamics. The investigated cavities have a square cross section. A low-Mach-number flow with a thin laminar boundary layer introduces tonal sound emission due to fluid dynamic feedback. Both upstream-mounted and downstream-mounted corner actuators have been tested, where the resulting body force is directed either into or out of the cavity. The upstream-mounted actuators influence cavity tonal feedback. An inward-inducing actuator suppresses the cavity tone up to a freestream velocity of . An outward-inducing actuator influenced mode switching. Downstream-mounted actuators did not influence the cavity aeroacoustics. Particle image velocimetry is used to investigate the fluid dynamics. The actuator induces velocities up to for an applied voltage of 15 kV at 4 kHz. The induced velocity is directed perpendicular to the freestream direction. A secondary circulating flow is developed in the cavity, which modifies the fluid dynamic feedback mechanism.
Corner-Type Plasma Actuators for Cavity Flow-Induced Noise Control
AIAA Journal ; 52 , 1 ; 33-42
01.01.2014
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Corner-Type Plasma Actuators for Cavity Flow-Induced Noise Control
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