A Validation Study for RANS Based Modelling of Swirling Pulverized Fuel Flames

A swirling pulverized coal flame is computationally investigated. Eulerian–Lagrangian formulation used to describe the two-phase flow. Turbulence modelled within a RANS (Reynolds averaged numerical simulation) framework. Four turbulence viscosity- (TV) based models, namely standard k-ε model, realizable renormalization group theory and shear stress transport k-ω model are used. In addition, Reynolds (RSM) employed. The models assessed by comparing predicted velocity fields with measurements of other authors. terms overall average values, agreement predictions observed be range 20–40%. better performance RSM compared TV observed, nearly twice as experiments, particularly for swirl velocity. second part investigation, resolution discrete particle phase in modelling turbulent dispersion (TPD) size distribution (SD) Using random walk TPD, it shown that even five walks sufficient an accuracy quite high, less than 1% mean deviation from solution obtained thirty walks. approximation measured SD determined continuous Rosin–Rammler function, inaccuracies can occur its subsequent discretization demonstrated discussed. An investigation on classes (SC) indicates 12 SC required 18 SC. Although these numbers may not necessarily claimed sufficiently universal, they serve guidance, at least similar characteristics.