Develop a computational code for a constant pressure reactor with an initial premixedpropane (??3??8)-air mixture at an equivalence ratio of 0.75, pressure of 10 atm, and initialtemperatures of 1200...

Develop a computational code for a constant pressure reactor with an initial premixed propane (??3??8)-air mixture at an equivalence ratio of 0.75, pressure of 10 atm, and initial temperatures of 1200 K and 1400 K for the following: a. Using the global kinetic mechanism described in equations (5.1) and (5.2). b. Using Cantera and GRI 3.0 Plot the temperatures as a function of time for all initial conditions/mechanisms. Compare the results from the global mechanism vs the full GRI3.0. What can we say about the differences in auto ignition delay times, which can be defined as the time required for the temperature to spike, or when it reaches maximum temperature gradient? Is assuming global reaction for kinetics sufficient for predicting auto-ignition delay time?


ME 5214 – Combustion Homework #4 1. Develop a computational code for a constant pressure reactor with an initial premixed propane (?3?8)-air mixture at an equivalence ratio of 0.75, pressure of 10 atm, and initial temperatures of 1200 K and 1400 K for the following: a. Using the global kinetic mechanism described in equations (5.1) and (5.2). b. Using Cantera and GRI 3.0 Plot the temperatures as a function of time for all initial conditions/mechanisms. Compare the results from the global mechanism vs the full GRI3.0. What can we say about the differences in auto ignition delay times, which can be defined as the time required for the temperature to spike, or when it reaches maximum temperature gradient? Is assuming global reaction for kinetics sufficient for predicting auto-ignition delay time? 2. Show that for the combustion of a given amount (??) of a generic hydrocarbon (????) that ? = (?+? 4⁄ ) ? ( ?? ??? ), where ? is the moles of air for any (stoichiometric or non- stoichiometric) combustion reaction and Φ is the equivalence ratio. Develop an expression that allows you to determine the total mass flow rate into a well-stirred reactor using the fuel mass flow rate, equivalence ratio, and fuel type. 3. Develop a computational code for an adiabatic well-stirred reactor. Use the well stirred reactor to determine the mass fractions exiting a spherical reactor 100 mm in diameter with premixed propane-air mixture entering the reactor at 298K. The reactor is held at constant pressure of 1 atm. Calculate the C3H8, O2, CO2, H2O, and N2 mass fractions leaving the reactor as well as the temperature for residence times of 5 × 10−3 as a function of equivalence ratio (∅ ≤ 1). Use the model to determine the blowoff- characteristics for an equivalence ratio of 0.75 and 1.0 (See example 6.2 in text book)? You can Cantera example files (Python or Matlab) as a starting point