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 fl ow. 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 infl uence of a weak swirl on fl ame localization is low. If the length of the recirculation zone occurring in a strong fl ow vortex exceeds the length of the prefl ame zone, the fl ame front is entraped by the recirculation zone and moves upstream towards the channel inlet where fl ame stabilization occurs. At the initial segment of the fl ow, the chemical reaction is determined by Arrhenius kinetics. In the region directly adjacent to the fl ame, the combustion mechanism controlled by turbulence becomes signifi cant.
An investigation has been made into a turbulent combustion of an air–propane mixture in a swirl fl ow. 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 infl uence of a weak swirl on fl ame localization is low. If the length of the recirculation zone occurring in a strong fl ow vortex exceeds the length of the prefl ame zone, the fl ame front is entraped by the recirculation zone and moves upstream towards the channel inlet where fl ame stabilization occurs. At the initial segment of the fl ow, the chemical reaction is determined by Arrhenius kinetics. In the region directly adjacent to the fl ame, the combustion mechanism controlled by turbulence becomes signifi cant.
Author:  O. V. Matvienko
Keywords:  turbulence, combustion, swirl fl ow, air–propane mixture, heat transfer, computational fl uid dynamics
Page:  97