Pobeda furnace operation was studied in the Archimedes criteria range from 5 to 60 using the cold modeling method to determine fluid and gas dynamics of bubbling using a side-blowing gas-protected lance. A transparent reactor of the laboratory setup was made on a scale of 1 : 10. Cylindrical lance nozzle diameter was 5 mm, annular space was 1 mm and angle to the horizontal in the reactor working position was 12°. It is shown that air interaction with water at its excessive pressure of 105 N/m2 occurs in the form of a pulsating stream in a cyclical pattern with the different maximum torch size amplitude and the time required to achieve it. Dynamic borders of the primary near-nozzle zone were determined depending on the Archimedes criterion value for separate and cooperative gas flow through the lance shell and centralchannel in the stream straight-line development area (lmin  l  lmax). Dynamic head of torch pulsation at extremum points varies in the range of 6.00·10-5÷8.26·10-4 Pa. Empirical equations for stream length in straight-line and full stream development areas and liquid release height were obtained depending on the Archimedes criterion value. An intermediate layer of ejected liquid was found between circular and cylindrical submerged streams. Cooperative axial gas flow is maintained at identical Archimedes criteria of air supply to the shell and central channel for the values Arsh = Arc = 25 at a distance of 0.0094-0.0116 m from the nozzle edge. As a result of research conducted it should be assumed that there is no interaction of blast oxygen from the central channel of the double-flow lance with surrounding melt at a distance of 9-11 cm from the Pobeda furnace lining.