極超音速流中における衝撃波可視化のための放電特性について

概要

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An impulsive glow discharge technique is proposed to visualize shock waves around models in short duration hypersonic facilities. To clarify the characteristics of the discharge generated across a shock wave in hypersonic flows, gap voltage and current measurements are carried out. It shows a constant voltage characteristic of a typical normal glow discharge, that is, when the gap current increases, the gap voltage is kept constant. A shock wave is visualized as a nonluminous layer in its uniform positive column region. The shock wave inclination angle generated around a flat plate agreed well with that predicted by oblique shock wave theory, namely, the glow discharge did not distort the shock shape. The ratio of the electric energy discharged into the flow to the total enthalpy is found to be at most 0.1.
2003-12-05