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Old 07-24-2019, 10:58 AM   #6 (permalink)
aerohead
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ducting

Quote:
Originally Posted by hat_man View Post
Are there threads on this? Neat. What should I search under? I'd like to read about it.

I never thought of the drag from the surface area of a tube as being very high. I guess I thought the amount of pressure (flow?) of air pretty much negating this? But then again this is an area I have absolutely no expertise in.
It's impossible to recover more usable kinetic energy from internal,ducted flow,than from streamlined exterior flow. It violates the second law of thermodynamics,via skin-friction heating that would not be present in exterior flow.Also,you're robbing flow from the outside of the body,which always needs all it can get.
The lowest drag bodies are always 'streamlined' bodies,with the most minimum of internal flow.
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