Mach Wave Elimination
A new method for quieting high-speed jets
(U.S. Patents 5590520 and 5916127)
Jets with arcuate coflow
The eccentric jets produce very good downward noise reduction but the benefit declines with increasing azimuth angle. As a result, the drop of peak noise in the 45-deg azimuth is only half that in the 0-deg azimuth (vertical). An arcuate coflow nozzle has uniform flow thickness over its arc, therefore provides better noise reduction in the sideline direction.
We started testing these jets in Fall 2000. The results presented here are preliminary.
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