NUMERICAL SIMULATION OF TURBULENT GAS FLOW WITH COMBUSTION REACTIONS
Keywords:
mathematical model, turbulent jet, chemical reaction rate, total enthalpy, Arrhenius law, finite differences, numerical algorithm, computational experiment, combustion processes, turbulent model, Zeldovich function, chemical reaction, mass, velocity, temperatureAbstract
In this work, numerical methods are given for solving the problems of distribution and combustion of methane and an oxidizer a finite velocity in a turbulent flow. In the mathematical modeling of the jet flow, the full equations of the turbulent boundary composition of a multicomponent reacting gas are used. The process of one-stage irreversible combustion is described by the Arrhenius model with constants extracted in the work of C.A.Frolov and recorded. The flow turbulence is described by Sekundov equations. Methane is considered as a fuel, air was supplied with a co-current flow. The number of component conservation equations has been reduced with the use of ordinary and reduced Schwab-Zel'dovich functions. Numerical calculations were carried out in dimensionless Mises variables. The used implicit finite-difference scheme provided the second order of approximation accuracy in longitudinal and transverse coordinates. Due to the nonlinearity of the differential equations of substance conservation, internal (in terms of speed) and external (in terms of other indicators) iterative processes were organized. Some results of the computational experiment are presented. The calculation results for the temperature change on the flow axis are compared with the experimental data.
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