a) Consider experimental images of air flow over symmetrical airfoils shown in Figure 1.Discuss and indicate the direction of the resultant lift and drag forces for each case.FR.(a)(b)Figure 1: Air flow around symmetrical airfoils, (a) at zero angles of attack and (b) ata large angle of attackb) For aircraft, the minimum takeoff velocity can be determined from the requirement thatthe total weight (Wi) of the aircraft be equal to lift force. Suggest and discuss twosolutions that can be applied to minimise the required takeoff velocity.low e the angre ofredueeattackthe veightuftheaircraft.c) Assume laminar flow over a flat plate with linear velocity distribution inside theboundary layer. Apply suitable boundary conditions and develop linear velocity equationinside the boundary layer.

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Consider experimental images of air flow over symmetrical airfoils shown in Figure 1. Discuss and indicate the direction of the resultant lift and drag forces for each case.

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

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Author:Kreith, Frank; Manglik, Raj M.

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Chapter5: Analysis Of Convection Heat Transfer

Section: Chapter Questions

Problem 5.49P

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Question

a) Consider experimental images of air flow over symmetrical airfoils shown in Figure 1.
Discuss and indicate the direction of the resultant lift and drag forces for each case.
FR.
(a)
(b)
Figure 1: Air flow around symmetrical airfoils, (a) at zero angles of attack and (b) at
a large angle of attack
b) For aircraft, the minimum takeoff velocity can be determined from the requirement that
the total weight (Wi) of the aircraft be equal to lift force. Suggest and discuss two
solutions that can be applied to minimise the required takeoff velocity.
low e the angre of
reduee
attack
the veight
uf
the
aircraft.
c) Assume laminar flow over a flat plate with linear velocity distribution inside the
boundary layer. Apply suitable boundary conditions and develop linear velocity equation
inside the boundary layer.

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