Discussion
Chevrons on a nacelle exhaust nozzle are fitted to
Answer: B
Correct answer: Reduce jet mixing noise
Chevrons are the serrated triangular cut-outs at the trailing edge of a nacelle or nozzle. They generate streamwise vortices that promote finer-scale mixing between the jet and the surrounding air.
Mixing noise arises from the large turbulent structures at the boundary between fast and slow air; breaking them into smaller structures shifts the noise to higher frequencies, which attenuate faster in the atmosphere, and reduces the low-frequency energy that carries to the ground. The cost is a small thrust loss, accepted for the noise benefit.
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