16100lectre11_cg (1)

16100lectre11_cg (1) - Notes on CQ #1 1 pV12 2 1 q 2 = pV22...

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Notes on CQ #1 () 1 2 11 22 2 Re Re d d d Dq c C c C Drag scales withV C V ∞∞ ′ = ′ = ⇒× = = = = = V C V V C V q V p q V p q 2 2 1 1 1 2 2 2 2 1 1 Re Re 4 2 1 2 1 N N 1 2 2 1 2 1 2 3 3 77 2 (Re) Fromdata, Re Laminar flow behavior Re , . . Turbulent Re , d d V V d c C C c DVc f C DV Dw i t h V ′ = ∝⇒ ′ ∝ ′′ ∝∝ ⇒↑ Note dependence on chord 6 1 7 2 , c.f. Turbulent Dc Drag Polar N N or Ll ref ref usually usually wing chord planform LL CC qS q ≡≡ A C L C D C D min C D 0 0 C L min increasing α stall
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Notes on CQ 16.100 2 For many aircraft, () min min 2 min DD LL CC kCC ≅+ Also, since min min &0 o L C ≈≈ 2 O D DL k C The first option will be slightly more accurate, but both are reasonable approximations. Notes on CQ #2 (1) First, we note that & O D Ck will almost certainly depend on the Reynolds number. But, this dependence is probably weak since the b.l. flow will be turbulent. So, we assume & O D remain constant to good approximation.
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16100lectre11_cg (1) - Notes on CQ #1 1 pV12 2 1 q 2 = pV22...

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