In order to handle the ever increasing demand of energy and reduce the dependence on fossil fuels, biomass represents a possible alternative and has been classed as renewable energy source by the European Union and the United Nations. This thesis investigates the influence of different burner designs on characteristics of pulverised biomass flame and more precisely, the impact of swirling motion created by a swirler inlet on the flow field in the combustion chamber. The velocity flow field has been determined for three swirl settings with two different methods: Particle Image Velocimetry (PIV) and Computational Fluid Dynamics (CFD). No-, halfand full-swirl setup were investigated for both methods with further four different velocity ratios as part of the PIV experiment. The experiment was conducted in the laboratory at Lulea University of Technology and validation shows a maximal deviation of 6% between each run with the PIV system. Issues faced during the experiment and potential improvements (e.g. different seeding particles or recording settings) are stated in the thesis. The velocity fields for the noand half-swirl setups show reasonable and replicable results, but the full-swirl setup resulted in spurious vector fields. This was caused by exceedingly fast dispersion of the particles, a very fast shift from axial movement to radial movement and consequently, an out-of plane movement of particles out-of the laser sheet. The CFD simulation of the biomass burner was modelled and simulated using the software ANSYS - Fluent. Validation of the mesh shows very good to perfect mesh elements and result validation confirm reasonable results. The length of the resulting velocity fields shows a strong dependence on the swirl-setting as well as the change in radial movement becomes evident. The comparison between PIV and CFD shows very good congruence of the velocity for the first 2-10cm in the combustion chamber. Afterwards, the velocity values of both methods differ with considerably faster convergence to lower values for the PIV experiment.