NUMERICAL STUDY OF DIFFUSION COMBUSTION OF METHANE IN AN AXISYMMETRIC TURBULENT JETS BASED ON MODEL PRANDTL
Keywords:
turbulent jet, gas mixture, diffusion flame, temperature, velocity, total enthalpy, finite differences, computational experiment, mathematical model, implicit scheme, nonlinear equation, Mises variables, turbulent model, axis-symmetrical flowAbstract
In this article, a numerical method, algorithm, and numerical solutions are proposed for solving the problem of dispersion and diffusion combustion of methane in an axisymmetric flow of air in an infinite satellite flow. Dimensionless equations of the turbulent boundary layer of interacting gases were used to model the object. To solve the nonlinear differential equations of the system, a two-layer, four-point implicit finite difference scheme was used. Due to the non-linearity of the station storage and displacement equations, an iteration process was used. Due to the non-linearity of the differential equations of conservation of matter, internal (by speed) and external (by other indicators) iterative processes were established. In combustion processes, the rate of reaction of gas and air was taken to be very high, that is, they react as soon as they meet, and it was considered that diffusion burns. In this case, since the movement of the jet flow is a turbulent flow, the value of turbulence was found using the model of Prandtl. The results of calculating the temperature change along the flow axis are confirmed by experimental data. Separate results of numerical experiments are presented.
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