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homework3 - 40 P Pa, propagates through still air at 20°C...

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MAE 113 – Fundamentals of Propulsion Homework Assignment 3 Winter, 2011 Due: Thursday, January 27 th in Class Page 1 of 1 Problem 1 An ideal gas flows adiabatically through a duct. At section (1), p 1 = 140 kPa, T 1 = 260°C, and V 1 = 75 m/s. Farther downstream, P 2 = 30 kPa and T 2 = 207°C. Calculate V 2 in m/s and ( s 2 - s 1 ) in J/(kg K) if the gas is (a) air, = 1.4 (b) argon, = 1.67 Problem 2 A certain aircraft flies at the same Mach number regardless of its altitude. Compared to its speed at 12000-m Standard altitude, it flies 127 km/hr faster at sea-level. Determine its Mach number. Problem 3 A weak pressure wave (sound wave), with a pressure change
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Unformatted text preview: 40 P Pa, propagates through still air at 20°C and 1 atm. Estimate: (a) the density change (b) the temperature change (c) the velocity change across the wave. Problem 4 The Concorde aircraft flies at M = 2.3 at 11-km standard altitude. Estimate the temperature in °C at the front stagnation point. At what Mach number would it have a front stagnation point temperature of 450°C? Problem 5 Air expands isentropically through a duct from 1 P =125 kPa and 1 T =100°C to 2 P = 80 kPa and 2 V = 325 m/s. Compute: (a) 2 T (b) M 2 (c) T 0 (d) P (e) V 1 (f) M 1...
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This note was uploaded on 01/18/2012 for the course MAE 113 taught by Professor Staff during the Spring '08 term at UCSD.

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