| In recent years, detail chemical reaction kinetics and reduction to detail chemical mechanism are important research problems which combustion community concerned most. The two problems were numerically investigated in this work. First, detail chemical mechanism was analyzed and established in this work. Furthermore, a numerical study of liquefied petroleum gas (LPG)/air flames and hydrogen-enhanced LPG/air flames was presented. The effect of hydrogen addition was studied. At last, methane/air premixed combustion system was analyzed based on computational singular perturbation. Finally 15-step reduced chemical mechanism was constructed and validated to this combustion system.Application of detail chemical kinetics was presented in this work. Numerical simulation of C3,C4 hydrogen fuel combustion was performed. We enhanced sub-mechanism to modify detail chemical mechanism and established finally detail mechanism. Validation of the chemical kinetic model against the fundamental combustion data was performed to insure accuracy. Mole fraction of resultant, intermediate radicals and pollution were calculated. In addition, independent simulations were conducted to study the effects of hydrogen addition to LPG/air flame structure. The effects of hydrogen addition to stabilization of lean combustion were also investigated in the opposed jet symmetric, twin flame configuration.A numerical study based on computational singular perturbation (CSP) in a methane/air premixed combustion system was undertaken. This method splits reaction spaces to eliminate stiffness, identifies quasi-steady- state species by analyzing CSP pointer locally and integrally as well as simplifying algebraic relations and differential equations by using CSP indexes. Finally, a 15-step globally reduced mechanism was constructed. The 15-step reduced mechanism was tested and verified in this work. Advantages of CSP method were discussed.
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