Mach Wave Elimination
A new method for quieting high-speed jets
(U.S. Patents 5590520 and 5916127)
PHYSICS OF HIGH-SPEED JET NOISE
Once the speed of the jet exceeds about 450 m/s, the dominant noise comes from the supersonic motion of the jet eddies relative to the ambient. Each eddy acts like a supersonic bullet, creating shock waves (Mach waves) which propagate noise into the far field.
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