Developed reduced reaction mechanisms for practical high hydrocarbon fuels

Reduced chemical kinetic models have been developed to describe the combust ion fundamentals for practical high hydrocarbons fuels over a wide range of experimental conditions. The fuels include n-Butane. Benzene, n-Heptane, G asoline, Kerosene (JP-8), and n-Hexadecane. The mechanism for each fuel inc ludes a single reaction expression for fuel and oxygen to form formaldehyde (CH2O) and hydrogen (H-2) or carbon monoxide (CO), together with a detaile d reaction mechanism for CH2O-CHO-CO-H-2-O-2 oxidation. These kinetic mecha nisms will be as generally applicable as possible and can be used in 2-D or 3-D combustion models to understand the practical combustion and emission problems in engines and furnaces. Each mechanism consists of 13 chemical sp ecies with 22 elementary reactions. The present reduced kinetic mechanisms are used in one-dimensional laminar premixed flame model and incorporated detailed representation of transport fluxes to predicted laminar burning velocity and flame structure. These pre dicted results were compared satisfactorily with the experimental data for each fuel over a wide ranges of equivalence ratio, pressure, and temperatur e. In addition, the flammability limits for different types of fuels were a lso examined. A single reaction expression for breakdown each of the above fuels has been driven here, and is used with CH2O-CHO-CO-H-2-O-2 mechanism to predict satisfactorily the experimental combustion fundamentals for thes e practical fuels. These mechanisms are only valid from lean to near stoich iometric flames and they also, lead to improve the accuracy of the predicte d radical species compared to the past quasi-global model that has assumed CO and H-2 as reactions products. An algebraic expression for burning veloc ity of each fuels is derived, in terms of equivalence ratio, initial pressu re and temperature, and can be used in complex models.