Application of unstrained flamelet SGS closure for multi-regime premixed combustion

摘要: Large eddy simulation of turbulent premixed combustion behind a bluff-body is performed using unstrained flamelet model with presumed probability density function to calculate filtered reaction rate. The subgrid variance the progress variable required in this approach calculated its transport equation include contributions from reaction, turbulence and molecular diffusive dissipative processes at sub-grid scales. dissipation rate obtained an algebraic closure, which maintains physical consistency among turbulence, diffusion. Various quantities such as mean velocity, temperature species mass fractions computed for two flames experiencing 2% 24% intensities are compared their respective measurements. These comparisons very good suggesting that SGS closure works well multi-regime combustion. demonstrated success modelling framework explained on basis.