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Compressible flow
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====Prandtl–Meyer compression fans==== [[File:Prandtl-Meyer Compression Fan.JPG|thumb|Basic PM compression diagram]] A Prandtl–Meyer compression is the opposite phenomenon to a Prandtl–Meyer expansion. If the flow is gradually turned through an angle of δ, a compression fan can be formed. This fan is a series of Mach waves that eventually coalesce into an oblique shock. Because the flow is defined by an isentropic region (flow that travels through the fan) and an [[anisentropic]] region (flow that travels through the oblique shock), a slip line results between the two flow regions.
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