Reaction Dynamics Research Of Combustion And Emissions Formation In An Airecrft Engine

A detailed （including67species and344reactions） and a reduced reaction mechanism（including50species and118reactions） of n-decane which was chosen as a surrogate fuel forkerosene were built. The ignition delay time of this surrogate fuel in the shock tube and theprocess of premixed combustion in the premixed burner were simulated by adopting thedetailed and reduced reaction mechanisms, and the simulated results were compared with theexperimental data. Furthermore, the flow characteristics and the reaction kineticcharacteristics of combustion process and the formation of emissions and active species in atube of the annular tube combustor were analyzed by combining this reduced reactionmechanism with the CFD computational software（Fluent） when the aircraft engine was incruise state and the slow train state, and the computational results were compared with that ofthe global reaction mechanism of C₁₂H₂₃fuel. The results show that the ignition delay time,and the shape of the profiles of the mole fractions of the reactants, the major combustionproducts simulated using the reduced mechanism are agreed well with the experimental data.Furthermore, compared with the global reaction mechanism of C₁₂H₂₃fuel, when adopting thereduced reaction mechanism of n-decane, temperature field is accord well with the practicalsituation, and the computational outlet temperature is closer to the designing outlettemperature of the combustor. At the same time, the process of fuel low temperaturedecomposition and formations of pyrolysis products, active species and main emissions aremore detailed understood.