- A shock wave at 90° to the direction of airflow. It is found ahead of an airfoil approaching the speed of sound. Airflow behind the normal shock is invariably subsonic. Also called a normal shock wave.
Aviation dictionary. 2014.
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Oblique shock — A small scale X 15 placed in a NASA supersonic wind tunnel produces an oblique shock wave at the nose of the model (along with other shocks). An oblique shock wave, unlike a normal shock, is inclined with respect to the incident upstream flow… … Wikipedia