What is it about?
In recent years a lot of attention has been on small plasma actuators and their potential applications. This paper presents an analytical model and experimental findings with respect to a specific plasma actuator: Cathodic-Arc-Jet. This Cathodic-Arc-Jet is formed under atmospheric pressure. The CAJ velocity is shown to be driven by a plasma-gas boundary that initially propagates at a few kilometers per second. A quasi-equilibrium model is developed that considers the effect of increasing arc current on the boundary propagation speed. During the current discharge transient, < 80 ns, the model is in good agreement with the measured CAJ velocity. Subsequently, flow entrainment in the fast core modifies the CAJ from a hemispherical shape to a jet like structure. At a distance of ≈ 1 mm the CAJ speed is ≈ 200 m/s.
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Why is it important?
The model and experimental data within this paper are important to characterise the phenomena of the Cathodic-Arc-Jet. And within the bigger picture, the potential of small plasma actuators for real-life applications (aeronautical flow manipulation, etc.).
Perspectives
This paper contains some significant discoveries on the formation and propagation process of a micro plasma actuator, in this case, the Cathodic-Arc-Jet. New knowledge about the velocity profile of the pressure front, and the geometry of the plume are presented.
Mr Leon Z.F. van Rossum
Technische Universiteit Delft
Read the Original
This page is a summary of: Characterization of the Formation Process of Cathodic-Arc-Jet in Atmospheric Pressure Gas, January 2017, American Institute of Aeronautics and Astronautics (AIAA),
DOI: 10.2514/6.2017-0159.
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