Shock precursor observations

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Abstract
An experimental investigation has demonstrated that the previously observed wall‐supported shock precursor, in high‐explosive‐driven argon‐containing shock tubes, rapidly grows to a maximum length at a tube length‐to‐diameter ratio of 2. It then gradually decreases in length and grows in width as a steady‐state configuration is apparently asymptotically approached. All experiments were done in 10.2‐cm tubes varying in length from 10 to 80 cm. The explosive was Comp C‐4, and the exterior surface of the tube was surrounded by a 4‐mm‐thick layer of Deta‐sheet to minimize wave attenuation. The experimental assembly was tamped in sand. The precursor was observed with a smear camera as the wave system interacted with a thin aluminum foil covering the end of the tube.

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