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MAE 112
PROPULSION
FINAL EXAM
March 22, 2007
Do all four problems in 120 minutes.
Books, notes and calculators can be used freely.
1. An afterburner has an exhaust temperature of 2700
°
R into a nozzle and operates at five
atmospheres of pressure. For every mole of liquid octane fuel C
8
H
18
added to the
afterburner, the inflowing mixture of product gases and excess air has 16, 18, 25, and 188
moles, respectively, of CO
2
, H
2
O, O
2
, and N
2
. The liquid fuel is introduced to afterburner
at the initial temperature of 500
°
R and has a heating value Q=19135 Btu/lbm.
Neglect
dissociation. Assume the flow through both the afterburner and the nozzle has an average
molecular weight of 30, c
p
= 0.33 Btu/lbmR and a ratio of specific heats equal to 1.25.
a) Determine the final number of moles (per mole of the original fuel) for each of
CO
2
, H
2
O, O
2
, and N
2
.
b)
Determine the gas temperature of the inflow to the afterburner.
c)
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This test prep was uploaded on 04/07/2008 for the course MAE 112 taught by Professor Sirgiano during the Winter '08 term at UC Irvine.
 Winter '08
 Sirgiano

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