Ch5.Examples

# Ch5.Examples - Chapter 5 Worked-Out Examples 5.2 NACA 1412...

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Chapter 5 Worked-Out Examples

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5.2 NACA 1412 airfoil 3 foot chord 5 degree alpha 100 ft/sec freestream speed at sea level Compute lift, drag forces, and moment about quarter-chord per unit span
Approach: Appendix D

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Approach First compute Reynolds number • Look up C l , C d , C m at closest Reynolds number. In real world applications, a computer program will interpolate between Reynolds numbers. Find L’, D’, and M at quarter chord using relationships that define these in terms of Cl, Cd, and Cm.
Problem 5.3 NACA 23012 airfoil Chord 0.3 m Freestream velocity 42 m/sec at 1 atm, 303 degree K. Find density ρ from equation of state. 8 degree angle of attack. We are asked to compute L’, D’, and M’ Same approach as 5.2, different airfoil, SI units.

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Problem 5.4 Same airfoil as 5.3, same freestream velocity, pressure, density, and temperature. We are given L’, asked to find alpha
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## This note was uploaded on 08/17/2011 for the course AE 1350 taught by Professor Johnson during the Spring '07 term at Georgia Institute of Technology.

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Ch5.Examples - Chapter 5 Worked-Out Examples 5.2 NACA 1412...

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