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

PUBLICATIONS

PUBLICITY & AWARDS

TMWE:   JETS WITH ARCUATE COFLOW
Directivity of OASPL

Very-far-field measurements (r/D=200) performed without anechoic chamber
Azimuth (phi)=0 deg

Jet: Mach 1.5, 700 m/s
Coflow: Mach 0.95, 360 m/s, bypass ratio=1.7

polar_angle.jpg (1539 bytes) azimuth_angle.jpg (2389 bytes)

tmwe_arc_oaspl_comp1.jpg (28555 bytes)

Black (diamonds): single jet
Green (circles): jet plus arcuate coflow
Red (squares): jet plus coaxial coflow at roughly the same mass flow rate

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