MAE2_Lecture6

MAE2_Lecture6 - Wings Wake Vorticies Induced Drag Lift...

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Wings Wake Vorticies Induced Drag Lift Curve Slope Swept Wings Wing Flaps MAE 2 Campbell, J.F., and Chambers, J.R., Patterns in the Sky, NASA SP-514, 1994.
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2 MAE 2 Wake Vorticies A wake vortex is created by air “leaking” around the tips of a finite-length wing. Pressure over the bottom surface is greater than that on the top surface. Flow establishes a circular pattern downstream of the wing. airflow Right wing counter-clockwise rotation when viewed from behind Left wing clockwise rotation when viewed from behind
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MAE 2 Vortex Effects The wingtip vortices cause a downward velocity component on the wing itself. This downward flow is called downwash . Downwash reduces the effective angle-of-attack at the airfoil. Lift coefficient slope is reduced relative to angle-of-attack (will derive later). Vortex downwash increases drag on the wing. This source of drag is called induced drag or drag-due-to-lift. There are many physical explanations for induced drag.
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This note was uploaded on 01/05/2011 for the course MAE 2 taught by Professor Nomura,k during the Fall '08 term at UCSD.

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MAE2_Lecture6 - Wings Wake Vorticies Induced Drag Lift...

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