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Determination of the induced Drag for a rectangular wing |
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April 9, 2015, 13:11 |
Determination of the induced Drag for a rectangular wing
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Hello,
I am currently working at an Optimization for Wingtip Fences for a rectangular wing in subsonic (incompressible) flows. For my seminar paper one task is to determine the separate drag forces. To determine the induced drag I watch the losses of momentum in the control volume. Di = [(Pressure@IN)-(Pressure@OUT)] dy dz = 0.5*(Density)*(v^2+w^2) dy dz Expression in Post: "0.5*Density*areaInt((Velocity v)^2+(Velocity w)^2)@OUT" where v and w are the induced velocities in a yz-Plane (Trefftz), very far behind the wing. I have observed, that the viscosity of the used gas (air at 25°C) has no large influence at the so calculated drag. Additional to that, I determined the zeroliftdrag (nearly the parasitic drag) and subtracted it from the general wingdrag to become a guess for the induced drag. My question: Why are the results for the induced drag so different for the different ways of calculation? Thank you very much! |
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