S1904-1-5 極小空気プラズマジェットの半径方向放射特性(大気突入・減速技術(1))

概要

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Spectroscopic measurements of air micro-plasmajets were performed in the wavelength region of 280 to 420 nm where N2_^+ 1- and N_2 2+ bands were predominant. The spectra were measured at many radial and axial points to obtain its radiative characteristics in detail. Abel inversion method was applied to all the experimental data measured laterally to obtain true spectral intensity distribution at all radial points. The comparison of the experimental and Abel-inverted spectra showed that the experimental data could not be used directly to deduce temperatures without the Abel inversion except around the flow axis. Temperatures of the plasma-jets were estimated by applying the spectral matching method to N2_^+ 1- bands. Rotational temperature was about 8000 K almost independent of radial positions, and vibrational temperature was about 28000 K in the core region with much higher in the outermost region.
2009-09-12