Homework 6 2010 (1)

Homework 6 2010 (1) - 4262: Rockets and Mission Analysis...

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Assigned: November 9, 2010 Homework #6 Due: November 23, 2010 Computer-based Problem: Write a computer code to solve for the adiabatic flame temperature and product composition for hydrogen-oxygen combustion over a range of equivalence ratios. The products of the reaction are H 2 O, H 2 , H, O 2 , O, and OH. Compare your results to STANJAN or NASA CEA. Problem 1: Calculate the flame temperature of normal octane (C 8 H 18 ) burning in air at an equivalence ratio of 0.5. For this problem assume that there is no dissociation of the stable products formed (stable products in this case are CO 2 , H 2 O, N 2 and O 2 ). All reactants are at 298 K and the system operates at a pressure of 1 atm. Hf° for C 8 H 18 is -250.31 KJ/mol. Problem 2: Carbon monoxide is oxidized to carbon dioxide in an excess of air (1 atm) in an afterburner so that the final temperature is 1,300 K. Under the assumption of no dissociation, determine the air- fuel ratio required. Report the results on both a molar and mass basis. For the purposes of this problem assume that air has the composition of 1 mol of oxygen to 4 mol of nitrogen. The carbon monoxide and air enter the system at 298 K. Problem 3: The atmosphere of Venus contains 5% carbon dioxide and 95% nitrogen by volume. It is possible to simulate this atmosphere for Venus reentry studies by burning gaseous cyanogen (C 2 N 2 ) and oxygen and diluting with nitrogen in the stagnation chamber of a continuously operating wind tunnel. If the stagnation pressure is 20 atm, what is the maximum stagnation temperature that could be reached while maintaining Venus atmosphere conditions? If the stagnation pressure was 1 atm, what would the maximum temperature be? Assume all gases enter the chamber at 298 K. Take the heat of formation of cyanogen as ( H f °) 298 = 374 kJ/mol. 1
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This note was uploaded on 01/23/2011 for the course PHYS 123 taught by Professor Smith during the Spring '07 term at UC Davis.

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Homework 6 2010 (1) - 4262: Rockets and Mission Analysis...

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