this post was submitted on 16 Jun 2023
76 points (98.7% liked)
UKCasual
6073 readers
1 users here now
A friendly place to chat.
No politics please. Don't be a dick.
founded 1 year ago
MODERATORS
you are viewing a single comment's thread
view the rest of the comments
view the rest of the comments
It reduces the turbulence at the trailing edge, reducing noise. Bernouli's principle dictates that part of the force on the blade is due to the airflow on each side moving at different speeds, if the crashed into each other all at once, you'd get a lot of turbulence, and hence noise. The serrations ensure that the two flows meet over a longer distance, reducing said turbulence.
Same reason you see chevrons on the back of some modern turbofan engines