Publikace na Matematicko-fyzikální fakulta |
2015
Abstrakt
Arc-anode attachment in a DC plasma arc stabilized by water vortex and argon, influences power distribution in the plasma, lifetime of the anode and also flow structure of the plasma jet. A movement of the attachment and the surrounding plasma has been directly observed by using a high-speed camera (max. 1,080,000 fps).
The observations were compared with cathode-anode voltage measurements (sample rate 80 MHz). More than one attachment was observed in one frame with exposure time 0.25 us or 0.29 us.
We have directly measured average velocities of the attachments and hydrodynamic waves above them, as well as the characteristic dwell times and dwell frequencies of the attachments.