Mach angle

Mach angle

[′mäk ‚aŋ·gəl]
(fluid mechanics)
The vertex half angle of the Mach cone generated by a body in supersonic flight.

Mach angle

The acute angle between a weak shock wave and a free-stream airflow. Hence, at Mach 1, the Mach angle is 90°, and, thereafter, its value is equal to sin−1 × 1/M. It is represented by the symbol μ. See also Mach cone.
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He begins this single-authored text with basic facts: definitions, supersonic flow, speed of flow, temperature rise, Mach angle, thermodynamics of fluid flow, and so on.