アーク加熱風洞流におけるNOバンドの放射特性

概要

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Spectra of nitric oxide (NO) bands were measured for air plasmas in a free stream and in a channel nozzle of the NAL 750 kW arc-jet wind tunnel to obtain radiative characteristics and temperatures of the flows. Measured band intensity distributions were analyzed on the process model, in which electronically excited NO molecules are populated from the continuum state by the inverse pre-dissociation reaction N+O → NO (C2Π), followed by a population redistribution on molecular energy states due to collisions and radiation. Synthetic spectra by that model agreed well with measured ones. Temperature determination was also made using the spectral matching method, resulted in rotational temperatures of 680±30 K in the free stream and 2, 000±300 K in the channel nozzle flow. It was found that the vibrational temperature in the free stream was considerably lower than 1, 000 K and that the electronic excitation temperature was impossibly determined in principle.
社団法人日本航空宇宙学会の論文
2001-02-05