Question 1 a) The mean camber line of an aerofoil is defined by the relations: m XX x 2q C с с x Zc = m с (1-9)² | ->q. In the above, c is the aerofoil chord. Given that, m = 0.045, q = 0.25, and using thin aerofoil theory estimate: i) The lift coefficient when the angle of attack (AOA) is given as 3°. ii) The zero-lift AOA of the aerofoil. iii) The moment coefficient with respect to the leading edge and the centre of pressure when the AOA is given as 3°. b) For an aerofoil similar to NACA 2412, the lift coefficient and moment coefficient about the quarter-chord at -8° AOA are found to be -0.6 and -0.0466, respectively. At 6° AOA, these coefficients are found to be 0.86 and -0.0354, respectively. Giving reasons for your method, calculate the zero lift AOA and the location of the aerodynamic centre.

Elements Of Electromagnetics
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Author:Sadiku, Matthew N. O.
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Question 1
a) The mean camber line of an aerofoil is defined by the relations:
m
XX x
2q
C с с
x
Zc =
m
с
(1-9)² |
->q.
In the above, c is the aerofoil chord. Given that, m = 0.045, q = 0.25, and using thin
aerofoil theory estimate:
i)
The lift coefficient when the angle of attack (AOA) is given as 3°.
ii) The zero-lift AOA of the aerofoil.
iii) The moment coefficient with respect to the leading edge and the centre of pressure
when the AOA is given as 3°.
b) For an aerofoil similar to NACA 2412, the lift coefficient and moment coefficient about
the quarter-chord at -8° AOA are found to be -0.6 and -0.0466, respectively. At 6° AOA,
these coefficients are found to be 0.86 and -0.0354, respectively.
Giving reasons for your method, calculate the zero lift AOA and the location of the
aerodynamic centre.
Transcribed Image Text:Question 1 a) The mean camber line of an aerofoil is defined by the relations: m XX x 2q C с с x Zc = m с (1-9)² | ->q. In the above, c is the aerofoil chord. Given that, m = 0.045, q = 0.25, and using thin aerofoil theory estimate: i) The lift coefficient when the angle of attack (AOA) is given as 3°. ii) The zero-lift AOA of the aerofoil. iii) The moment coefficient with respect to the leading edge and the centre of pressure when the AOA is given as 3°. b) For an aerofoil similar to NACA 2412, the lift coefficient and moment coefficient about the quarter-chord at -8° AOA are found to be -0.6 and -0.0466, respectively. At 6° AOA, these coefficients are found to be 0.86 and -0.0354, respectively. Giving reasons for your method, calculate the zero lift AOA and the location of the aerodynamic centre.
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