A numerical model has been developed to analyze the sodium fire in a columnar flow. The computation is validated by the experimental data. Rusults show that, the high temperature zone nearby the nozzle is growing long and widely with the combustion. When hot gas and cold air encounters, the eddies appear. The distribution law of sodium monoxide is similar to the temperature. The lowest concentration of sodium monoxide appears at the bottom of the burner where the eddies exist.
