![]() ![]() Normal At 90° (perpendicular) to the shock medium's flow direction. ![]() ![]() This change in the matter's properties manifests itself as a decrease in the energy which can be extracted as work, and as a drag force on supersonic objects shock waves are strongly irreversible processes. When a shock wave passes through matter, energy is preserved but entropy increases. Unlike solitons (another kind of nonlinear wave), the energy and speed of a shock wave alone dissipates relatively quickly with distance. The sonic boom associated with the passage of a supersonic aircraft is a type of sound wave produced by constructive interference. ![]() The accompanying expansion wave may approach and eventually collide and recombine with the shock wave, creating a process of destructive interference. įor the purpose of comparison, in supersonic flows, additional increased expansion may be achieved through an expansion fan, also known as a Prandtl–Meyer expansion fan. Like an ordinary wave, a shock wave carries energy and can propagate through a medium but is characterized by an abrupt, nearly discontinuous, change in pressure, temperature, and density of the medium. In physics, a shock wave (also spelled shockwave), or shock, is a type of propagating disturbance that moves faster than the local speed of sound in the medium. Circular marks are visible where the expanding spherical atmospheric shockwaves from the gun firing meet the water surface. Schlieren photograph of an attached shock on a sharp-nosed supersonic body USS Iowa firing at broadside during training exercises in Puerto Rico, 1984. ( September 2015) ( Learn how and when to remove this template message) Please help to improve this article by introducing more precise citations. This article includes a list of general references, but it lacks sufficient corresponding inline citations. ![]()
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