Email from Max Flight

From: Max Flight
Date: July 28 2019
Subject: Jet engine scallops

Those scallops you saw on the jet engine are called chevrons. They reduce engine noise by managing the way the high-speed exhaust mixes with the relatively low-speed bypass air (that being the air from the large fan that flows around the engine core) and the air flowing around the nacelle. When flows of different temperatures and speed come together, they create a lot of turbulence. The turbulence, it turns out, makes a lot of noise. The chevrons reduce air turbulence where the flows meet and thus reduce engine noise.

The actual physics is a bit more complicated, but that's the overall idea.

I'm definitely going to Osh next year. SnF too.


Max Flight
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