Didn't realise that windmill blades are serrated
Didn't realise that windmill blades are serrated
Took the weans a walk away up the back of The Three Towns in Ayrshire where they are installing these big bad boys.
They disrupt the trailing edge eddies - which is what causes any noise - and so make them quieter. They are often fitted in areas where sound might be a particular issue.
I can't hear the word eddies without thinking Hitchhiker's Guide
"Eddies," said Ford, "in the space-time continuum."
"Ah," nodded Arthur, "is he. Is he."
So why don't my CPU/case fans have serrated edges as well? Because they are too small?
Some do, e.g. Noctua: https://noctua.at/en/vortex-control-notches
They are surrounding a farm with hunners of cows in multiple fields, so I wonder if the noise is quite scary for them, hence efforts to make them quieter. Or the farmer insisting. Are they usually quite loud?
Unless if they be milling grain those are turbines if I'm not mistaken
Aye but doesn't sound as quaint though, does it?
True, maybe they could be both? They should have little mill yer own grain stations at the bottom lol
I guess a lot of grain mills use electric motors now, so in a way they are.
Helps them chop up birds better
Huh, TIL. Had no idea they were serrated either.
brb
Look at the size of those bad boys!
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
As others have said, mostly about noise reduction. There's actually work looking whether the same concept could be developed for electric aircraft.
There's something oddly disturbing about this fact. I don't like it!
The Bird-Slurry 3000 is almost complete!