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THE CERTAIN PECULIARITY OF OVEREXPANSION OF SUPERSONIC FLOW IN A CYLINDRICAL PIPE,
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
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The results are given of experiments with supersonic airflow in a cylindrical pipe. The configuration and dimensions in millimeters of the pipe are shown 1 the Laval nozzle 2 a set of Hg manometers for measuring the static pressure and 3 the pipe with asbestos insulation. The ultrasonic flow was generated by means of two vacuum pumps operating in parallel. The results of pressure measurements are shown. The distribution of the normalized reatmospheric pressure is shown with respect to the pipe length. The lower curve corresponds to the existence of supersonic flow in all parts of the pipe. The other curves correspond to the overexpansion of the flow with pseudo-jumps. The increase in the pressure in the region of pseudo-jumps measured during the experiments exceeded the theoretically predicted values. Author
APPROVED FOR PUBLIC RELEASE