Abstract
This paper describes high-speed digital photography and numerical calculation for radiation emanating from strong shock waves in air. By using a high-speed gated image intensified CCD camera, the time-frozen images of total radiation emission are obtained. The radiation profiles have 1 peak for the velocities up to 11km/s, while the profiles have 2 peaks when the velocities exceed 11km/s. In addition, there is a transition region between 10.7km/s and 11.4km/s where both radiation profiles can exist. The experimental results are compared with the numerical ones. The numerical calculation is based on the Park model which takes into account 11 species and 47 chemical reactions. The experimental profiles are found to be narrower than the numerical ones.
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