MAE112FinalExam_2007

MAE112FinalExam_2007 - MAE 112 PROPULSION FINAL EXAM March...

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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/lbm-R 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.

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MAE112FinalExam_2007 - MAE 112 PROPULSION FINAL EXAM March...

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