NUMERICAL SIMULATION OF TURBULENT GAS FLOW WITH COMBUSTION REACTIONS

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 vt −92  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.