The appearance in a shock tube of weak shock waves that interact to form a basic shock wave is investigated. It is shown that, in a gas that is under propulsion, both acoustic perturbations (M = 1) and weak shock waves (M = 1.03-1.40) are produced by the propellant. The first arise when a flow of propellant gas passes around the sharp edges of a bursting diaphragm and the second arises in the motion of a region of finite density change behind the front of the second nonsteady shock discontinuity. The Mach machine of the basic shock wave varies from 1.5 to 3.
Faculty of Physics, Moscow State University, Leninskie Gory, Moscow, 119992, Russia
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