DRAG & LIFT SOLVED PROBLEMS - Philadelphia University · Lift Force on Body: A S bc p = = 6. Lift...
Transcript of DRAG & LIFT SOLVED PROBLEMS - Philadelphia University · Lift Force on Body: A S bc p = = 6. Lift...
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SOLVED PROBLEMS
CHAPTER (11)
DRAG & LIFT
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SUMMARY
1. Drag Force on Body:
2. Drag force on body is a combination of Form Drag (Pressure
Forces) and Skin Friction Drag (Shear Stress Forces).
3. Coefficient of a Drag of a Sphere For Re<0.5 (Stokes Drag):
4. Frequency of vortex Shedding is Given by (St = Strouhal) Number:
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5. Lift Force on Body: cbSAp ==
6. Lift Coefficient For a Symmetric Two – Dimensional Wing (No tip
effect):
7. Drag Coefficient Corresponding to the Minimum Induced Drag:
8. Streamlining at high Re reduces the drag due to pressure and increase
the viscous drag.
9. Streamlining at Low Re increases the drag due to viscous forces.
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Problem (11.7)
h=75m
D=2.5m
DF
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Problem (11.17)
D=0.5msmV 3=
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Problem (11.20)
VFPPower ×==
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Problem (11.27)
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Problem 11.33 (p. 476)Problem 11.33 (p. 476)
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Problem (11.33)
25% reduction in drag when vanes introduced
Given projected area (Ap)=8.36 m2
CD without vanes = 0.78
V=100 km/hr
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Problem (11.38)
IbfWSPHERE 27=
Sphere diameter = 1 ft
S.G = 0.85
?min =alTerV
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Problem (11.38)
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Problem (11.49)
L=80 cm, d = 20 cm
Weight = 200 N
?min =alTerV
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Problem (11.49)
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Problem (11.73)
( )( ) 4.1
2.18
=
=
StallingL
LandingL
C
CspeedstallingthanfastersmisspeedLanding
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THE END