Abstract
Non-scanning 3D-CT technique using a multi-directional quantitative schlieren system with flash light source is proposed to obtain instantaneous 3D density distributions of unsteady flow phenomina. This "Schlieren 3D-CT" is based on (i)simultaneous acquisition of flash-light schlieren images taken from numerous directions, and (ii) 3D-CT reconstruction of the images by an appropriate CT algorithm. In this technique, fast flash-light source enables the observations of high-speed flows, e.g. super sonic flows. In this paper, with custom-made 20 directional schlieren camera, an instantaneous density distribution of steady under-expanded supersonic jets, which issue from an axisymmetric miniature nozzle of exit diameter of 1.0 mm, designed Mach number 1.5, have been CT-reconstructed.
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