Two-dimensional features of strong shock waves in gases

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Abstract
Strong shock wave around 10 km/s are generated in low‐density (13.3 Pa) air and nitrogen by using a free‐piston, double‐diaphragm shock tube with the test section of 40mm×40mm. Two‐dimensional features of radiation intensity behind the shock waves are observed at the test section by using a combined system of an image converter camera and an image processor. The pseudo‐colour representation and the contour plot of radiation intensity clearly real various types of two‐dimensional profile of radiation. In addition to the regular type, two irregular types of oblique and two‐step profile are observed. Furthermore, the time histories of radiation intensity are derived from an image processing, and give us various informations about the radiative characteristics of the shocked air and nitrogen.

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