Preliminary investigation of the use of afterglow for visualizing low-density compressible flows

James M. Benson, Thomas W. Williams
Feb 1949

An investigation is described in which the phenomena of afterglow were utilized to make visible the low-density supersonic flows of various gases. Photographs of the afterglow in the supersonic flow about wedges are compared with schlieren photographs for densities corresponding to static pressures of from 3 to 8 millimeters of mercury.

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