They are intentionally built into the blade. I am fanning a hard time remembering if they are leading our trailing edge without finding the picture I took at the time. I am sure there is someone who had worked with these and knows as in sure they serve a purpose. I put positive flair because I am guessing it has some physics reason. Thanks in advance!
In: Physics
One set of holes allow air to leak into the low pressure side to reduce condensation of the water there. Wet blades weigh more and don’t work as effectively.
Another set at the blade tip disturb the tip vortex shedding. This can reduce drag but I think it’s mostly to avoid whipping birds into the next blade tip.
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