Boundary Layer Closure in the Conical Shock Tube

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Abstract
The characteristics of the shock front produced in the Naval Ordnance Laboratory explosive driven conical shock tube differ both from those of its free-air analog and those of the shock in a conventional shock tube. The presence of walls makes it different from a free-air spherical explosion shock; the fact that it is in a diverging rough-walled cone makes it different from the conventional tube shock. Measurements of dynamic pressure and opacity of the gases behind the front and light output from the explosion gases were made near the wall of a conical tube at various distances from the site of an explosion. Results are interpreted in terms of turbulent boundary layer closure.

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