The Overall Reaction Concept in Premixed, Laminar, Steady-State Flames. I. Stoichiometries.
ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
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Combustion processes normally involve a large number of chemical species, related through a complicated reaction network and strongly interacting with the fluid flow and molecular transport. A common approach is to simplify the system by assuming a single overall or global reaction. In this paper, we will examine the adequacy of the overall reaction model for premixed, laminar, one-dimensional, steady-state flames. Our procedure is to first solve the equations governing the detailed chemistry model. The overall reaction rate parameters are then found from a least squares fit of the heat release profile. The overall reaction model equation can then be solved and the solution compared with the detailed model solution. This is done for three different flames over a range of stoichiometries. The single reaction model gives quite accurate results for flame speed. The temperature and heat release profiles are also generally accurate. The accuracy of the major species profiles varies from fair to good. However, the optimal overall kinetic parameters do vary with stoichiometry.
- Inorganic Chemistry
- Combustion and Ignition