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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 Spring '10
 Staff
 Fluid Dynamics, Mach number, p1, Shock wave, duct inlet, Gas Dynamics Spring

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