Shock diamonds form when the supersonic exhaust from a propelling nozzle is slightly over-expanded, meaning that the static pressure of the gases exiting the nozzle is less than the ambient air pressure. The higher ambient p… 展开

Shock diamonds are most commonly associated with jet and rocket propulsion, but they can form in other systems.
When artillery pieces are fired, gas exits the cannon muzzle at supersonic speeds and produces a serie… 展开