METHANE-AIR MIXTURE NONSTATIONARY COMBUSTION PROCESS IN COAL MINES MODELING TASK STATEMENT

The mechanisms of the flame acceleration and combustion transition to detonation in a coal mine conditions are considered. Approaches are analyzed to the flame acceleration study and combustion transition to detonation; to the turbulent flows in nonstationary combustion modeling. For modelling the FlowVision software package is chosen. The modeling initial data is formulated. The study is supposed to be performed on the basis of numerical modeling of a stoichiometric methane-air mixture nonstationary combustion process using the following models: model based on the averaged non-stationary (URANS) Navier-Stokes equations; the standard k-ε model of turbulence; the combustion model on the basis of a one-stage irreversible combustion reaction; the model of the gross-reaction rate - the vortex d issipation model (EDM); radiation modeling - diffusion model P-1; the model energy transfer by radiation - the weighted sum model of gray gases (WSGGM). Modeling is supposed to be performed for a pipe with one closed and one open end and obstacles inside the pipe, while igniting it at the closed end. The obstacles turbulizing combustion are annular septa with geometric parameters corresponding to the dimensions of the support in coal mines.