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An Introduction to Compressible Flow by Forrest E. Ames

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CHAPTER 4

OBLIQUE SHOCK WAVES

Supersonic flows cannot gradually adjust to the presence of an object in the flow because pressure waves travel at the speed of sound, and are therefore unable to sense the presence of the object. One way supersonic flows can abruptly adjust to the presence of an object is through a normal shock wave. As we noted, this can result from the back pressure on a supersonic flow in a wind tunnel or compressible flow duct producing a stationary shock wave. The normal shock wave can also be produced by a moving projectile or a gas moving through a pipe or the response of a gas moving through a pipe to an abrupt valve closure. What type of situation can produce an oblique shock wave?

An oblique shock wave occurs when a supersonic ...

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