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spacecannon
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United States - Member - New Member

Join Date: Feb 2009
Location: Mojave Desert, Southern California
Posts: 515
Good Answers: 13

Ducted Air Compression

02/10/2009 12:53 PM

Low preasure air moving through a duct will speed up as the duct narrows, as when passing through a funnel. Is there an optimum funnel angle to do this, does the angle change w/ air density and/or preasure, is there a formula for this? This is being applied to a nacelle on slow moving (50 mph) research aircraft at 20-30,000 ft. this is not my homework, Im just an inventor. thx Spacecannon

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lyn
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Join Date: Oct 2008
Posts: 42355
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#1

Re: Ducted Air Compression

02/10/2009 6:15 PM

Turbulence is your biggest enemy. Smooth transitions are best, generally, and don't forget to leave the last 3/5 duct diameters straight to calm the flow.

At these low velocities/high altitudes a square transition and longer tube may be as efficient.

Didn't catch the duct diameter.

I'm sure the formulas will be forthcoming.

I don't do math.
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spacecannon
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#2

Re: Ducted Air Compression

02/10/2009 6:53 PM

thx LynLynch, open end diameter is apx. 30m on the smaller unit and 100 meters on the big one, lengths are 7-10 times the width, I also need to calculate how small I can neck the funnel down to w/o significantly reducing air flow.

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lyn
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#3
In reply to #2

Re: Ducted Air Compression

02/10/2009 11:43 PM

Sorry,

I really don't do math that big!
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