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abasile60
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Join Date: Oct 2006
Location: Princeton, NJ
Posts: 48

Aero calc: airstream on a cylinder

08/28/2007 5:34 PM

Need help calculating the force of an airstream acting on a cylinder segment. Also, the cylinder axis is tilted into the airstream at an angle of attack (picture an aircraft door on the belly of a circular aircraft fuselage).


Thanks for any references.
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PWSlack
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United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
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#1

Re: Aero calc: airstream on a cylinder

08/29/2007 3:38 AM

The 'drag coefficient' relates the instantaneous force on the cylinder segment to the velocity of the stagnant streamline. Needless to say, the drag coefficient varies with airspeed. Check out a good aeronautical engineering textbook. Perry's 'Chemical Engineers' Handbook' also gives several methods of determining this.

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abasile60
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Join Date: Oct 2006
Location: Princeton, NJ
Posts: 48
#2
In reply to #1

Re: Aero calc: airstream on a cylinder

08/29/2007 12:04 PM

Thanks for the reference, I'll take a look. The aero books that I have looked at treat flow around a cylinder that is normal to flow direction. The angled cylinder axis is putting a twist on the problem.


I have heard suggestions to use projected cylinder area normal to flow but I hope to find a published example, or a more developed suggestion.
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