Hybrid Flow Control Method
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United States of America Patent
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Issued Date -
Mar 3, 2016
app pub date -
Apr 3, 2014
filing date -
Apr 3, 2013
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A system for controlling flow unsteadiness and noise reduction. One or more microjets are placed around the periphery of a jet nozzle in conjunction with a porous surface acting as the impingement surface. As an aircraft is taking off or landing, vertically, the microjets are activated to inject a stream of high-velocity fluid into the shear layer of the main jet at an angle from the main jet centerline. The microjets disrupt the feedback phenomenon, reducing the resonant-dominated aspect of the flow while the porous surface breaks up the coherence of the jet and reduces the broadband noise of the flow.
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