5310 Combustion Introduction Lecture 8

5310 Combustion Introduction Lecture 8 - MAE 5310:...

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MAE 5310: COMBUSTION FUNDAMENTALS Introduction to Chemical Kinetics September 15, 2011 Mechanical and Aerospace Engineering Department Florida Institute of Technology D. R. Kirk
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CHEMICAL KINETICS OVERVIEW In many combustion processes, chemical reaction rates control rate of combustion Chemical reaction rates determine pollutant formation and destruction Ignition and flame extinction are dependent on rate processes Overall reaction of a mole of fuel, F, with a moles of oxidizer, O, to form b moles of products, P, can be expressed by a global reaction mechanism as: From experimental measurements, rate at which the fuel is consumed expressed as: [ χ i ] is molar concentration of i th species in mixture Equation states that rate of disappearance of fuel is proportional to each of reactants raised to a power Constant of proportionality, k global , is called global rate coefficient, which is a strong function of temperature and minus sign indicates that fuel concentration decreases with time Exponents n and m relate to reaction order Reaction is n th order with respect to fuel Reaction is m th order with respect to oxidizer Reaction is (n+m) th order overall bP aO F + [ ] ( 29 [ ] [ ] m O n F global F M M T k dt M d - =
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EXAMPLE OF INTERMEDIATE SPECIES Consider global reaction of conversion of hydrogen and oxygen to water The following elementary reactions are important: First reaction produces hydroperoxy, HO
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This note was uploaded on 02/11/2012 for the course MAE 5310 taught by Professor Danielkirk during the Fall '09 term at FIT.

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5310 Combustion Introduction Lecture 8 - MAE 5310:...

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