GDyn06Exams

# GDyn06Exams - mae 422 Gas Dyna mics Spring 2006 EXAM 1 1....

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mae 422 Gas Dynamics Spring 2006 EXAM 1 1. The local conditions after a normal shock in air, ( 4 . 1 = γ ), are M = .4512, p= 5 atm, T= 370 K. What is the Mach Number and velocity before the normal shock ? Sketch a temperature entropy diagram for this process showing local and stagnation conditions at the beginning and end of the process. 2. Air is flowing in a constant area duct which has a constant friction factor of .005 over its full length and an inlet pressure of 14.7 psi. At a point 40 ft from the duct inlet the pressure is 13.2 psi and the Mach Number is .4. If the duct is choked at its exit what is the length of the duct ? Sketch a temperature entropy diagram for this process showing local and stagnation conditions at all three state points. . 3. What heat transfer rate in kJ/kg air is required to choke a supersonic flow in a duct if the local conditions at the duct inlet where heating begins are M=3.5, p= .5 atm and T= 200 K ? Sketch a temperature entropy diagram for this process showing local and stagnation conditions at the beginning and end of the process.

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## GDyn06Exams - mae 422 Gas Dyna mics Spring 2006 EXAM 1 1....

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