Mach’s construction Dr Andrew French.

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Presentation transcript:

Mach’s construction Dr Andrew French

What has a supersonic shockwave got to do with some really simple trigonometry?

Mach’s construction Ernst Mach 1838-1916 shock front Object moving at speed v creating waves as it moves ‘Infinitesimally thin’ spherical shells of disturbance are created continuously as the object moves. They radiate out at the wave speed c

Mach’s construction c is the wave speed v is the velocity of the object making the waves Mach number

Kelvin wedge via Mach’s construction?

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