# hw2 - MAE135 Homework No 2 Spring 2010 Date assigned...

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Unformatted text preview: MAE135 Homework No. 2 Spring 2010 Date assigned: Tuesday, April 6, 2010 Due date: 5:00 pm Tuesday, April 13, 2010 Assume calorically-perfect gas with γ =1.4 for all problems. PROBLEM 1 (10 points) Consider the SR-71 at flight Mach number M 1 =3.0 with ambient pressure p 1 = 10 , 000 N/m 2 and ambient temperature T 1 = 200 ◦ K. At the lower surface of the wing, the local Mach number is M 2 = 2 . 5. Assuming isentropic flow, find the pressure p 2 and temperature T 2 at that point. PROBLEM 2 (10 points) V p 8 p 8 The pitot-static probe is a device found on every airplane and is used for measurement of the flight velocity and flight Mach number. It measures simultaneously the total pressure p and the static pressure p ∞ . An on-board computer uses an algorithm to translate these measurements into the flight Mach number M ∞ , which is then displayed to the pilot. Suppose that the computer is unsophisticated and uses the incompressible Bernoulli equation p = p ∞ + 1 2 ρ ∞ V 2 ∞...
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hw2 - MAE135 Homework No 2 Spring 2010 Date assigned...

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