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

AEROACOUSTIC FACILITIES AT U.C. IRVINE

The flows are generated in a dual-stream jet facility capable of supplying mixtures of helium and air to either stream.  Noise data are acquired with a Bruel & Kjaer Model 4138 (1/8") condenser microphone.  A movable anechoic chamber is positioned around the jet when noise data are acquired. 

Schematic of dual-stream jet facility


cojet_diagram.jpg (18505 bytes)

Picture of a coaxial jet nozzle sandwitched between the lenses of the schlieren system

cojetimage.jpg (15585 bytes)

 

Cutaway of anechoic chamber

anechoic_cutout.jpg (26380 bytes)

External view of anechois chamber.  It is movable on wheels.

anechoic_image.jpg (10947 bytes)

Assortment of various jet and coflow nozzles

round_nozzles.jpg (20959 bytes)

And our first attempt at creating an arcuate nozzle; ugly but effective.

fiberglass_arcuate_nozzle.jpg (12887 bytes)

 

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