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Holographic Interferometric Study Of Shock Transition Over Wedges

Paper reports a successful application of a holographic interferometry to a flow visualization study of a shock transition over wedges in a shock tube. Experiments were conducted on a 60 mm x 150 mm shock tube of the Institute of High Speed Mechanics, Tohoku University for Mach numbers from 1.1 to 3.0 in air. Using a pulsed laser double exposure holographic interferometry the shock transition over concave or convex walls and multiple straight wedges was quantitatively observed. Consequently the critical transition angles over these wedges were determined and in addition to this a hysterisis effect in the truly non-stationary transition phenomena was clarified. Advantages of applying the holographic interferometry to the high speed gasdynamics were demonstrated.