Abstract
Three-dimensional flow phenomena with unsteady shock waves and vortices have been observed in a shock tube experiment by using an interferometric CT (computed tomography) technique. A model with small ducts, which has a pair of cylindrical nozzles, is introduced in the test section of the shock tube. The model can be rotated around its central axis to change the observation angle. The projection image of density distribution for each observation angle is obtained by using a fixed Mach–Zehnder interferometer. The three-dimensional density distribution is reconstructed from these projection images. The shock Mach numbers are fixed to 2.3 at the exits of the nozzles in nitrogen gas of 19.4 kPa initial pressure. The resultant 3D density flow fields are illustrated by several visualizing methods to clarify the 3D features of shock waves, vortices and their mutual interactions.
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