关键词: 阴极形状, 电弧等离子体位形, 阴极弧根, 磁分散电弧

Abstract:

The arc plasma in the coaxial magnetically dispersed arc plasma generator exhibits typically dispersed uniform arc column as well as diffusive cathode root. The arc root characteristic depends on the boundary condition as well as the cathode shape. Magnetically dispersed arc plasma coupled with different shape of cathode is numerically simulated by simplified cathode sheath model with FLUENT. The result shows that the cathode arc root appears to be dispersive, the order of magnitude of which is 107A•m^-2. The configurations and the current density of arc root which has an effect on the plasma distribution highly rely on the cathode shape. With the apex angle of the cathode increase, the cathode arc root moves from the tip to the side of the cathode. The plasma moves downstream and the thickness of the cathode decrease.

Key words: Cathode shape, Cathode arc root, Plasma configuration, Dispersed arc