A multi-fuel swirl-stabilized laboratory burner of 100kW total thermal input has been developed, designed as a scale model of a 110MW coal burner. This paper presents a computational investigation of the combusting flow field produced by the laboratory burner under varying aerodynamic conditions. The numerical predictions were compared with measured quantities in terms of velocities and temperatures at various distances away from the burner exit. Three turbulence models were tested, while for the combustion modeling, the non-premixed approach incorporating the mixture-fraction concept was employed. Satisfactory agreement between measured and predicted quantities was achieved, especially by applying the RNG k-ε and the Realizable k-ε turbulence models.