Induced Velocity

From the result derived in class

Подпись:TO

Подпись: Ww [y(t)] = -U22nAn

n=1 the distribution of induced velocity reads

wW[y(t)] = —UA1 – sin3^ = —2UA1 – 2cos21

Induced Velocity Подпись: 2l b

= -2UA‘ (‘- 2 (b )’)

The parabolic distribution of ww [y(t)] is shown in Fig. 15.39. The wing experiences upwash for |2y/b| > 1Д/2.

15.10.2.3 Induced Drag

The percent change in induced drag is 33 % increase compared to the elliptic loading. The corresponding efficiency factor is e — 0.75.

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