High-Speed Visualization of Total Radiation and CARS Measurement of Vibrational/Rotational Temperatures behind Hypervelocity Shock Waves of 5 km/s

Abstract

In this research we have tried to apply the CARS method to the measurement of vibrational and rotational temperatures with radiation behind the strong shock wave, and have also used high-speed camera to obtain 2D image of total radiation. The strong shock waves are generated by a free-piston, double-diaphragm shock tube with low-density test gas. As the results, CARS measurement for vibrational and rotational temperatures of hypersonic flow behind the strong shock waves has been satisfactorily established over 5km/s shock velocity. We also succeeded to acquire the ultra high-speed 2D image of total radiation of hypervelocity flow with strong shock waves.