Global reaction schemes for hydrocarbon combustion

Laminar burning velocity of hydrogen-methane/air premixed flames

We have investigated theoretically a variety of burner-stabilized and freely propagating NH3/2 and NH3/H2/2. flames. The agreement between theory and experiment is generally good except, perhaps, for very rich flames, where it appears that the kinetic model may be missing important pyrolysis steps. Nevertheless, the important NO and N2 formation reactions can be identified. In lean flames, nitric oxide is produced primarily through the nitroxyl (HNO intermediate, formed either by the reaction of NH2. with oxygen atoms or NH with hydroxyl and oxygen molecules. Similarly, in lcan flames conversion of NO to N2. is by reaction with NH2 or NH, forming NNH or N2.O as intermediates. Under richer conditions NH2.and NH are rapidly converted to nitrogen atoms, and the extended Zel'dovich mechanism becomes responsible for NO formation and the conversion of NO to N2. In addition to our analysis of the nitric oxide production and destruction paths, we find from a sensitivity analysis that the most important r...

Kinetic Modeling of the Oxidation of Ammonia in Flames

The computation of stretched laminar methane-air diffusion flames using a reduced four-step mechanism

We consider the deflagration wave problem for a compressible reacting gas, with species involved in a single step chemical reaction. In the limit of small Mach numbers, the one-dimensional traveling wave problem reduces to a system of reaction-diffusion equations. Existence is proved by first considering the problem in a bounded domain, and taking an infinite domain limit. In the singular limit of high activation energy within the Arrhenius exponential reaction term, we prove strong convergence to a limiting free boundary problem; the latter is characterized by a jump of the derivatives, which we determine.

Traveling Wave Solutions to Combustion Models and Their Singular Limits

Abstract–We discuss a numerical method for determining the flame speed and the structure of freely propagating, adiabatic flames. The method uses a finite difference procedure in which the nonlinear difference equations are solved by a damped, modified, Newton method. This approach is in contrast to the traditional approach of solving a related transient problem until a steady-state solution i5 achieved. Our method is computationally faster than other methods, and it is potentially more accurate because it employs an adaptive gridding strategy. We demonstrate its use for the determination of hydrogen-air flame speeds.

Determination of Adiabatic Flame Speeds by Boundary Value Methods

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Determination of Adiabatic Flame Speeds by Boundary Value Methods