モアレシュリーレン法と分光法を用いた大気圧Ａｒプラズマジェットの温度場の測定

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  • Temperature measurements of atmospheric Ar plasma freejets by means of the Moire-Schlieren and spectroscopic methods.
  • モアレシュリーレンホウ ト ブンコウホウ オ モチイタ タイキアツ Ar プラ

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The atmospheric Ar plasma freejets, generated by an electric arc discharge, are visualized and measured by the Moire-Schlieren method to obtain the details of their high temperature fields. Electron temperatures and electron number densities are also deduced from a combined method of the absolute intensity measurements of Ar spectral lines and the collisional-radiative process theory. From the experiments performed under the conditions of arc currents of 100-200 A and nozzle diameters of 3-4 mm, the following are found : (i) The gas temperatures are 1000-5000 K and the electron temperatures are about 8500 K. (ii) The distributions of gas temperature for the conditions show a similar form. (iii) The freejets are thermally in nonequilibrium, though the plasmas are fairly dense.

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