Particle tracking velocimetry in swirl-stabilised burners

Particle tracking velocimetry was applied in a water model of a swirl-stabi lised burner and quantified Lagrangian particle residence time distribution s in the near burner region and temporal evolution of particle mean square dispersion in axial and radial directions. The results suggest that instant aneous flow eddies with appropriate timescales increase particle response t o the flow and "trap" particles within the time-averaged recirculation zone in the near burner region. Central particle injection doubled particle res idence time up to the end of the internal recirculation zone relative to of f-axis injection and this may lead to lower NO, emissions.