Shock Induced Unsteady Flat Plate Boundary Layers and Transitions,
KYOTO UNIV (JAPAN) DEPT OF MECHANICAL ENGINEERING
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For the shock-induced unsteady boundary layers over a flat plate installed in a shock tube, the effect of velocity profile, not of surface cooling and compressibility, on the transition into turbulence is estimated by using Wazzans relation. The locus of the points of instability are drawn on the x-t diagram, where the lowering of instability points is found in the unsteady interaction region. The limiting case that the shock waves become weak correspond to that which the incompressible fluid starts to move impulsively. This flow is achieved in an intermittent liquid tunnel. And the transition of unsteady flat plate boundary layer is observed to take place earlier than the time predicted from the linearized theory.