Thread: Discussion boundary layer thickness
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Old Sep 29, 2012, 04:56 PM
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United States, GA, Atlanta
Joined Apr 2005
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It is actually possible to delay transition to turbulence in the boundary laryer by changing the shape of your fuselage, but that won't be an easy task and would probably only work for a specific flight condition.

That said, I agree with Kevin that boundary layer turbulence is probably not a big deal for you. I would be more concerned about separation on that sloped back part of the fuselage, because having the inlet subjected to separated flow would probably hurt performance and cause vibration.

If you need the fuselage to be that thick in order to store the battery and radio equipment, you might consider changing the shape a little so that the bulge is biased more towards the bottom. This would keep the slope smaller in front of the ducted fan and would make separation less of a concern. Could you include a side view so that it's easier to see the fuselage profile?
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