MAE112HW2 - Due: January 25, 2008 MAE 112 Winter 2008...

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1 Due: January 25, 2008 MAE 112 Winter 2008 Homework Assignment #2 1. Consider a rocket engine that uses liquid oxygen and liquid ethanol (C 2 H 5 OH) fuel aka ethyl alcohol. The oxygen mass-flow rate is 2.00 times greater than the fuel mass- flow rate. Ethanol is stored at 298K while the oxygen is stored at 85K just very slightly below its boiling point. Oxygen has a heat of vaporization of 6.81kJ/mole while the value for ethanol is 38.6 kJ/mole. The heat of formation of liquid ethanol is -277.0 kJ/mole. The specific heat at constant pressure for gaseous oxygen is 30.77 joules/mole ° K. The liquids are sprayed into the combustion chamber. (a) How much energy per mole is required to vaporize and heat a mole of oxygen to the temperature of 298K. (b) What is the expected ideal flame temperature? The ideal flame temperature aka theoretical flame temperature is the value with no dissociation. (c) Suppose the ethanol droplets vaporized more slowly than the oxygen droplets. The
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This homework help 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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MAE112HW2 - Due: January 25, 2008 MAE 112 Winter 2008...

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