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Description

Successful modeling of combustion and emissions in gas turbine engine combustors requires an adequate description of the reaction mechanism. For hydrocarbon oxidation, detailed mechanisms are only available for the simplest types of hydrocarbons such as methane, ethane, acetylene, and propane. These detailed mechanisms contain a large number of chemical species participating simultaneously in many elementary kinetic steps. Current computational fluid dynamic (CFD) models must include fuel vaporization, fuel-air mixing, chemical reactions, and complicated boundary geometries. To simulate these conditions a very sophisticated computer model is required, which requires large computer memory capacity and long run times. Therefore, gas turbine combustion modeling has frequently been simplified by using global reaction mechanisms, which can predict only the quantities of interest: heat release rates, flame temperature, and emissions. Jet fuels are wide-boiling-range hydrocarbons with ranges extending through those of gasoline and kerosene. These fuels are chemically complex, often containing more than 300 components. Jet fuel typically can be characterized as containing 70 vol pct paraffin compounds and 25 vol pct aromatic compounds. A five-step Jet-A fuel mechanism which involves pyrolysis and subsequent oxidation of paraffin and aromatic compounds is presented here. This mechanism is verified by comparing with Jet-A fuel ignition delay time experimental data, and species concentrations obtained from flametube experiments. This five-step mechanism appears to be better than the current one- and two-step mechanisms.

Publication Date

1-1-1993

Publisher

NASA, Lewis Research Center

City

Cleveland, OH

Keywords

02 PETROLEUM, 33 ADVANCED PROPULSION SYSTEMS, COMBUSTORS, COMPUTERIZED SIMULATION, EXHAUST GASES, GAS TURBINE ENGINES, JET ENGINE FUELS, OXIDATION, PYROLYSIS, ACETYLENE, CAPACITY, CHEMICAL REACTIONS, COMBUSTION, COMBUSTION CHAMBERS, FLUID MECHANICS, FUEL-AIR RATIO, GASOLINE, HEAT TRANSFER, HYDROCARBONS, IGNITION, KEROSENE, ETHANE, MIXING, PARAFFIN, PROPANE, REACTION KINETICS, ALKANES, ALKYNES, DECOMPOSITION, TILLATES, ENERGY SOURCES, ENERGY TRANSFER, ENGINES, FLUIDS, FOSSIL FUELS, FUELS, GAS OILS, GASEOUS WASTES, GASES, HEAT ENGINES, INTERNAL COMBUSTION ENGINES, KINETICS, LIQUID FUELS, MECHANICS, ORGANIC COMPOUNDS, OTHER ORGANIC COMPOUNDS, PETROLEUM, PETROLEUM DISTILLATES, PETROLEUM FRACTIONS, PETROLEUM PRODUCTS, SIMULATION, THERMOCHEMICAL PROCESSES, WASTES, WAXES

Disciplines

Aerodynamics and Fluid Mechanics | Aerospace Engineering

Comments

AIAA-Paper--93-0021

Simplified jet-A kinetic mechanism for combustor application
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