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Geometry optimization of linear and annular plasma synthetic jet actuators
- Publication Year :
- 2017
-
Abstract
- The electrohydrodynamic (EHD) interaction induced in atmospheric air pressure by a surface dielectric barrier discharge (DBD) actuator has been experimentally investigated. Plasma synthetic jet actuators (PSJAs) are DBD actuators able to induce an air stream perpendicular to the actuator surface. These devices can be used in the field of aerodynamics to prevent or induce flow separation, modify the laminar to turbulent transition inside the boundary layer, and stabilize or mix air flows. They can also be used to enhance indirect plasma treatment effects, increasing the reactive species delivery rate onto surfaces and liquids. This can play a major role in plasma processing and chemical kinetics modelling, where often only diffusive mechanisms are considered. This paper reports on the importance that different electrode geometries can have on the performance of different PSJAs. A series of DBD aerodynamic actuators designed to produce perpendicular jets has been fabricated on two-layer printed circuit boards (PCBs). Both linear and annular geometries were considered, testing different upper electrode distances in the linear case and different diameters in the annular one. An AC voltage supplied at a peak of 11.5 kV and a frequency of 5 kHz was used. Lower electrodes were connected to the ground and buried in epoxy resin to avoid undesired plasma generation on the lower actuator surface. Voltage and current measurements were carried out to evaluate the active power delivered to the discharges. Schlieren imaging allowed the induced jets to be visualized and gave an estimate of their evolution and geometry. Pitot tube measurements were performed to obtain the velocity profiles of the PSJAs and to estimate the mechanical power delivered to the fluid. The optimal values of the inter-electrode distance and diameter were found in order to maximize jet velocity, mechanical power or efficiency. Annular geometries were found to achieve the best performance.
- Subjects :
- Materials science
Acoustics and Ultrasonics
Pitot tube
02 engineering and technology
Dielectric barrier discharge
Condensed Matter Physic
Acoustics and Ultrasonic
01 natural sciences
Schlieren imaging
010305 fluids & plasmas
law.invention
Flow separation
Optics
law
0103 physical sciences
Plasma actuator
Plasma processing
business.industry
Electronic, Optical and Magnetic Material
Non-thermal plasma
Laminar flow
Mechanics
Electrohydrodynamic
021001 nanoscience & nanotechnology
Condensed Matter Physics
Plasma actuator geometry
Electronic, Optical and Magnetic Materials
Surfaces, Coatings and Films
Synthetic jet
0210 nano-technology
business
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....e2046dc1e00aef1d0eaceb7ed02efb19