A site on Aerodynamics

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Différentes formes de profil
Mach number (noted Ma)
Theory Elémentaire

The disturbances move with the speed of sound A.

That you it occurs if the source (in fact the plane) of these disturbances also move. 3 cases:
v<a subsonic flow

Mach number

v=a sonic flow

Mach number

v>a supersonic flow

Mach number

It is understood that the behavior of the waves of disturbances depends on the V/a report/ratio which one calls the Mach number. There is sin(a)=a/V=1/Ma Le cone of Mach is made of a shock wave (zone of stressings of the elementary disturbances where the phenomena are extremely violent one).

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