When an object breaks the sound barrier (traveling faster than the speed of sound in a fluid) it will create a shockwave. Most geometries will have a deflection angle (simplified as a wedge for our purposes) and will encounter a shockwave that has an angle less than 90 degrees. These shockwaves are microns thick and will alter the properties such as stagnation pressure and velocities of the air that passes through it. This phenomenon is used to increase jet engine performance by using nature to compress the airflow going into the engine which yields a higher efficiency for the engines to combust fuel.
Figure 9:
Visualization of Shockwave
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Figure 10:
Chart from Which Interpolation is Used
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Figure 11:
Equation from Which Interpolation is Used
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