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Serrated Nozzle on Jet Engines for noise reduction
Serrated nozzles on aircraft engines are for noise reduction. They have a slight efficiency penalty. They were put on the engines (Trent 1000 & GEnX) powering the Boeing 787 due to concerns that its composite fuselage would transmit more noise than a conventional aluminum one. They reduce noise by encouraging mixing between the hot & bypass flow and between the bypass and free-stream air. This reduces the shear force and consequential noise generation.
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