1998 年 41 巻 2 号 p. 390-396
Nonequilibrium radiation behind strong shock waves in low-density air is studied in terms of a computer-aided, high-speed photography using a gated I.I.CCD camera system for shock waves generated by a free-piston, double-diaphragm shock tube. The range of shock velocity is from 9 km / s to 12 km / s at the initial pressure 13.3 Pa. Numerical simulation for radiation profiles is also performed using a three-temperature model. It is found from a two-dimensional, time-frozen photography for the total radiation profile that the shock velocity for the transition criteria from 1-peak profile to 2-peaks profile is about 11 km / s, and that there are some discrepancies between observed and calculated profiles. Some remarkable phenomena are observed from the time-resolved spectroscopy: e.g., the longer radiation duration of the N+2(1-)(1, 0)line and the temporal oscillations of the intensities of spectral lines of the N+2(1-)band system. A comparison between observed and calculated streak images of the time-resolved spectroscopy is also presented.
JSME international journal. Ser. 1, Solid mechanics, strength of materials
JSME international journal. Ser. A, Mechanics and material engineering
JSME international journal. Ser. 3, Vibration, control engineering, engineering for industry
JSME international journal. Ser. C, Dynamics, control, robotics, design and manufacturing
JSME International Journal Series A Solid Mechanics and Material Engineering