Page 59 - Aerodynamics for Engineering Students
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42 Aerodynamics for Engineeting Students
Ellipto-Zhukovsky section at the mid-section of a three-dimensional wing.
Geometric incidence= 6'
Reynolds number=4.8x lo5
CP
42
-1.0
-0.8
-0.6
-0.4
-0.2
E
U.2
0.4
0.6
0.8
I .o
(a)
Fig. 1.20 Pressure distribution on an aerofoil surface
W
d = pqr sin E = pqr - = pwr per unit length
4
This rearwards component must be reckoned as a drag and is, in fact, the induced
drag. Thus the induced drag arises essentially from the downwards velocity induced
over the wing by the wing-tip vortices.
