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AME514-F04-final

# AME514-F04-final - AME 514 Applications of Combustion Fall...

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AME 514 – Applications of Combustion - Fall 2004 Final Exam 12/9/2004 Time allowed: 2 hours. Each problem is worth 25 points. Do any 4 of the 6 problems. You can try all of the problems, but turn in only 4 to be graded. The exam is open book and notes - use any reference materials you want, including laptop computers (as long as you don’t communicate with anyone of course). Exams and grades will be available Monday 12/13. 1. Anything goes Planet X is identical to earth in every way except that the ambient air temperature is 600K, not 300K as on earth. The atmospheric composition is still 21% O 2 and 79% N 2 as it is on earth and sea-level atmospheric pressure is the same as on earth. How would each of the following be different on Planet X? In particular, does the property increase, decrease or remain the same, and if it changes, does it change by more than, less that or exactly a factor of 2? Explain each in 1 or 2 sentences. Each part is worth 3 points, 1 point is free, do only 8 of 10 parts. Cross out or don’t do the 2 parts you don’t want graded. a) The rise speed at the lean flammability limit for an upward propagating premixed flame in a 5 cm diameter tube b) The amount of prompt NO emission in a rich premixed fuel-air flame at equivalence ratio 1.4 c) The relative importance of streamwise wall heat conduction compared to convection in a microscale counter-current (or Swiss roll) heat exchanger and combustor d) The rotation speed of a microscale turbine needed to produce a 2:1 pressure ratio e) The radius of an adiabatic flame ball in a lean mixture f) Spread rate of a thermally-thick fuel burning at microgravity (no forced flow) g) The turbulent burning velocity (S T ) of a stoichiometric fuel-air mixture in the distributed reaction zone regime (assume Damköhler’s model is the valid one, and assume u’ and L I same on earth and on Planet X) h) Liftoff height of a turbulent round jet (same jet diameter d o and mass flow rate as earth- based jet) i) Stagnation temperature at a flight speed of 5000 m/s (assume same ambient pressure on earth and planet X at the flight altitude, also assume the static temperature is 300K/600K on earth/X at flight altitude) j) Specific impulse of a pulse detonation engine

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2 2. Advanced fundamental topics – flammability, ignition, pollutant formation Ronney Chemicals, Inc., has invented a new fuel additive, called PDR ®
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