Dynamics of Helium Plasma Vortex in Open Air
碩士 === 國立中正大學 === 物理學系暨研究所 === 103 === The dynamics of vortex ring have been widely investigated for decades. The dielectric barrier discharge is also widely applied in industries and laboratories at atmospheric pressure. In our experiment, we investigates that the plasma vortex in open air is guide...
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| Format: | Others |
| Language: | en_US |
| Published: |
2015
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| Online Access: | http://ndltd.ncl.edu.tw/handle/87147620132374773216 |
| Summary: | 碩士 === 國立中正大學 === 物理學系暨研究所 === 103 === The dynamics of vortex ring have been widely investigated for decades.
The dielectric barrier discharge is also widely applied in industries and laboratories
at atmospheric pressure. In our experiment, we investigates that
the plasma vortex in open air is guided by the gas flow. We generate a helium
gas vortex and turn it into a plasma vortex by the capacitive coupling
and dielectric barrier discharge. The evolutions and travelling behaviours
of the gas vortex and the plasma vortex are observed by the Schlieren observation
and CCDs. We show that the plasma ring travels with the gas
ring, and the plasma ring shows the similar transformation to the gas ring.
The measurement of the plasma ring is consistent with the Widnall instability.
The vortex stability and plasma-gas interaction are also discussed.
The electric characteristic and plasma behaviour are observed by the ICCD
with the short exposure. We find that the plasma appears in the form of
the corona discharge and then transits to streamer-like discharge when the
pd value approaches to the threshold of the streamer discharge.
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