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mech6120-hw-083109

# mech6120-hw-083109 - MECH 5120/6120 Combustion Homework...

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MECH 5120/6120 Combustion Homework Assignment: Due Date: 8 September 2009 1. Calculate the rate of heat transfer in problem 5 of the previous set. You can assume complete combustion and a constant specific heat of the prod- uct stream equal to value of air at room temperature. Be sure to account for the effect of water condensation on the heat transfer. 2. Use the GASEQ software package to compute the adiabatic flame temper- ature of a methane/air flame as a function of equivalence ratio Φ. Take the reactants to be at 298 K, 1 atm, and assume that the products consist of the major species plus dissociation compounds: CO 2 , H 2 O , O 2 , N 2 , CO , H 2 , OH , O , H , NO Make the following plots: (a) A plot of CO and NO mole fraction as a function of Φ for Φ between 0.5 and 2. (b) A plot T AF T as a function of Φ for Φ between 0.5 and 2. Discuss the trends in the mole fractions, and explain why the flame tem- perature does not peak at stoichiometric conditions.
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