100 Data scatter Percentage of pressure drag (a) 0.2 0.4 0.6 0.8 1.0 Circular cylinder 0.3 Cp based on frontal area (tb) 0.2 Cp based on planform area (cb) Cp 0.1 - Width b Flat plate (b) 0.2 0.4 0.6 0.8 1.0 Thickness ratio Friction drag percent

100 Data scatter Percentage of pressure drag (a) 0.2 0.4 0.6 0.8 1.0 Circular cylinder 0.3 Cp based on frontal area (tb) 0.2 Cp based on planform area (cb) Cp 0.1 - Width b Flat plate (b) 0.2 0.4 0.6 0.8 1.0 Thickness ratio Friction drag percent

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter5: Analysis Of Convection Heat Transfer

Section: Chapter Questions

Problem 5.49P

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Question

The drag of an airfoil (Fig.) increases considerably if
you turn the sharp edge around 180° to face the stream. Can
you explain this?

100
Data scatter
Percentage of
pressure
drag
(a)
0.2
0.4
0.6
0.8
1.0
Circular cylinder
0.3
Cp based on frontal area (tb)
0.2
Cp based on planform area (cb)
Cp
0.1 -
Width b
Flat
plate
(b)
0.2
0.4
0.6
0.8
1.0
Thickness ratio
Friction drag percent

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