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ME 475/675 Introduction to Combustion

ME 475/675 Introduction to Combustion. Lecture 5. Announcements. Due Now (before lecture starts) HW 1 Extra Credit example Please turn in HW on white or engineering paper Grading based on solution (not solely on answers) Please bring you textbook to class

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ME 475/675 Introduction to Combustion

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  1. ME 475/675 Introduction to Combustion Lecture 5

  2. Announcements • Due Now (before lecture starts) • HW 1 • Extra Credit example • Please turn in HW on white or engineering paper • Grading based on solution (not solely on answers) • Please bring you textbook to class • What are good times for tutorials?

  3. Adiabatic () Flame Temperature Complete Combustion Products CCO2 HH2O PP = PR, T = TAd Stoichiometric Reactants TR PR • 1st Law, Steady Flow Reactor • All chemical energy goes into heating the products • To find adiabatic flame temperature use • PP = PR and

  4. Example (Turn in next time for Extra Credit) • Find TAd for a 25°C Stoichiometric mixture of Acetylene and air. • Constant pressure • PP = PR, HP = HR

  5. Constant Volume Adiabatic Flame Temperature V, m • so • Use definition: (since standard internal energy U is not tabulated) • Idea gas: , • Only and ) are unknown

  6. Example (turn in next time for EC) • Estimate the constant-volume adiabatic flame temperature for a stoichiometric acetylene and air mixture initially at 298 K and 101.325 kPa = 1 atm • Constant Volume

  7. Ideal Combustion • In real high temperature combustion the product species may dissociate (break apart) yielding • H2, OH, CO, H, O, N, NO, …. (no ?) • How to find final molar fractions of each component for different temperatures and pressures? • Chemical Equilibrium

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