乙烯燃烧化学动力学机理的简化与分析

The detailed chemical kinetic mechanism for ethylene was systematically reduced and analyzed using USC(University of Southern California)-Ⅱ mechanism with directed relation graph with error propagation (DRGEP) and path flux analysis (PFA) methods under the wide range of conditions. A skeletal mechanism with 38 species and 243 reactions was achieved from intersection of the two resulting skeletal mechanisms in the first-stage reduction. A skeletal mechanism of ethylene with 30 species and 167 reactions was obtained using sensitivity analysis in the further reduction, and maximum auto-ignition error was 7.10% under the above simulation conditions. This 30 species mechanism showed that, the auto-ignition delay times, laminar flame speeds, temperature and species profiles, brute-force sensitivity coefficients, reaction paths and uncertainty analysis were in good agreement with those of the detailed mechanism. At last, a reduced mechanism including 24 species and 20 global reactions was obtained using the quasi steady state approximation (QSSA) method. This mechanism reproduced satisfactorily auto-ignition delay times, making it more suitably for combustion modeling of engines.