6. Shock waves
A shockwave is a very thin zone of flow, less than 1 mm thick, which marks the transition from supersonic velocity upstream to subsonic velocity downstream. In the same space, pressure rises sharply. As a result, the fluid particles passing through the shockwave undergo an extremely high deceleration rate of up to 10 9 to 10 10 m /s 2 , or around one billion g. It's this violent impact, producing a real shock on the particles, which is the origin of the name given to this transition zone.
There are straight (or flat) shockwaves and oblique shockwaves.
6.1 Straight shock waves
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Shock waves
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