Simplified kinetic models of methane combustion to expand the capabilities of the OpenFOAM package and physicochemical libraries

Simplified mechanisms of combustion of hydrocarbon fuels are considered, on their basis the expansion of the capabilities of the OpenFOAM package and physicochemical libraries, applicable for the numerical simulation of processes occurring in methane-air mixtures, is carried out. A modified mechanism of combustion of hydrocarbon fuel is investigated. The choice of this substance is due to the prospects and practical interest in this type of fuel at the present time. Compares the results obtained by using the solvers created at the MAI and ISP RAS. A physical and mathematical model, numerical algorithms and results of calculations of non-stationary physical and chemical processes occurring in methane-air mixtures are presented. A comparison is made of the values of temperature and concentration of the chemical at constant pressure and enthalpy, the ignition time and the level of values of in are estimated when the state of thermodynamic equilibrium is reached. The process of flow of a methane-air mixture in a tube with reflection of a shock wave incident on the wall is considered. The unsteady equations of gas dynamics are solved numerically, supplemented by the equations of chemical kinetics. The effects of viscosity, thermal conductivity and diffusion are not taken into account. The distributions of the flow parameters behind the reflected shock wave are obtained and analyzed. The propagation of a detonation wave in an oscillatory mode is illustrated. The consistency of the calculation results of the solvers used is shown. Estimates of the possible application of this reduced combustion mechanism are given.

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