Mach Wave Elimination
A new method for quieting high-speed jets
(U.S. Patents 5590520 and 5916127)


THE CONCEPT

EXPERIMENTAL SETUP

ACOUSTIC DATA

APPLICATION TO AEROENGINES

TECHNOLOGY EXCHANGE

FUTURE PLANS

SPONSORSHIP

DOWNLOADS

PUBLICITY & AWARDS

THE 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.

Supersonic jet

machwave_emission.jpg (34215 bytes)

Supersonic bullet

supersonic_bullet.jpg (22411 bytes)

 

 

Back to main page