Dielectric Barrier Discharge Plasma Actuators with Novel Geometries for Flow Modification: Experimental Measurements and Validation with a 2-D Fluid Model
Abstract
Optical characteristics of surface dielectric barrier discharge (DBD) plasma actuators with wire/planar electrodes were studied using an intensified charge-coupled device camera and a monochromator in atmospheric pressure air. Spatial and temporal images were recorded both parallel and perpendicular to actuator surfaces on nanosecond time scales. By tilting the actuator surface, arc-shaped discharges jumping from above the powered wire across the dielectric above the grounded planar electrode were observed for the first time. Time resolved velocity measurements of the air flow fields induced by planar DBD actuators were also made by phase contrast imaging of buoyant plumes passing through the discharge. Studies of the use of DBDs to prevent flow separation from the suction side of an airfoil in air demonstrated that separation-control depends on the size of the exposed electrodes and the amplitude of the applied voltage. Suppression of separation was seen in both flow visualization images and in measurements of the lift produced by the airfoil. Coaxial radio frequency atmospheric pressure air plus helium DBDs with one electrode covered with glass were also investigated. The coaxial design allowed operation with very low power density plasmas and a much larger plasma size than the parallel plate designs.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 30, 2013
- Accession Number
- ADA597242
Entities
People
- Noah Hershkowitz
- Riccardo Bonazza
Organizations
- University of Wisconsin–Madison