燃焼ガスプラズマ境界層内での大電流巨大アーク発生限界に及ぼす電極物性の影響

概要

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Effects of physical properties of cathode materials on the transition of discharge mode in the boundary layer of combustion gas plasma have been investigated experimentally. At the transition to big-arcs, micro-arc currents fluctuate and some micro-arcs with arc current beyond a critical value grow up to big-arcs, breaking through the thermal boundary layer, whereas most of the micro-arcs with arc current below a critical value remain as micro-arcs adjacent to the electrode wall surface. The micro-arc currents at the transition to the big-arc mode become smaller for the copper electrode than for the stainless-steel and the titanium electrodes. In the case of a copper electrode with lower boiling point and latent heat of evaporation, the electrode material will evaporate rapidly and ionize at the high-temperature spot in spite of its high thermal conductivity, which easily results in micro-arc growth to big-arcs. It is concluded that the electrode materials having both infusible properties and high thermal conductivity can suppress the transition to big-arcs.
一般社団法人日本機械学会の論文
1994-05-25