ATTENUATION OF PEAKED AIR SHOCK WAVES IN SMOOTH TUNNELS
ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
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The attenuation of shock-front pressure for peaked air shock waves was measured along straight smooth-wall test sections of 1-, 2-, and 4-inch inside diameter shock tubes over travel distances up to 520-tunnel diameters. Shock overpressure between 50 and 450 psi for an ambient pressure of 1 atmosphere were produced by the use of helium or by burning M-9 propellant in the driver section of shock tubes. The lengths of the shock tube driver sections were changed to vary the shape of the shock waveform which caused the shock-front pressure to attenuate differently with distance. Pressure-time records are shown from piezoelectric pressure gages placed at ten test positions along the shock tube.
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