Mathematical Simulation of Turbulent Combustion of Air–Propane Mixture in Swirl Flow

An investigation has been made into a turbulent combustion of an air–propane mixture in a swirl flow. To calculate an averaged velocity of a chemical reaction, use was made of a combination of an eddy dissipation model and a kinetic model with account for turbulent pulsations. The influence of a weak swirl on flame localization is low. If the length of the recirculation zone occurring in a strong flow vortex exceeds the length of the preflame zone, the flame front is entraped by the recirculation zone and moves upstream towards the channel inlet where flame stabilization occurs. At the initial segment of the flow, the chemical reaction is determined by Arrhenius kinetics. In the region directly adjacent to the flame, the combustion mechanism controlled by turbulence becomes significant.