Homework 6

# Homework 6 - Unied Engineering Fluids Problems F17F19...

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Unified Engineering Spring 2004 Fluids Problems F17–F19 F17+F18. The airfoil shown is operating at M = 1 . 6. Sketch the flow pattern. a) Determine the pressure p a on the front upper facet. Also obtain the surface Mach number M a for part b). b) Determine the pressure on the rear upper facet. c) Using the surface pressures, determine the L , D , and corresponding c and c d . (Note: ρ V 2 = γ pM 2 ). c p , 10 10 M a b F19. The pressure-tank reservoir for a paint sprayer contains air at 50 psi (3 . 45 × 10 5 Pa), and T = 300 K . Air is to be supplied to the spray gun at a rate of 10 grams / s. What is the absolute minimum diameter of the air hose that’s required to supply this air?

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Problem M19 For wing spars bending loads are the major design driver. For engine disks the power density (and hence thrust) scales with the blade tip speed (V) squared. The centrifugal stress in a spinning disk is proportional to the density of the material used ( r ) and the tip speed squared, and to a good approximation this is given by: s ª 3 r V 2 . Thus engines are designed to
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• Fall '08
• STREKOWSKI
• Tensile strength, Fracture mechanics, fatigue crack growth, engine disks

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