A burner comprising several pipes (2, 4, 5, 6, 7) of parallel axes wherein: a central air supply pipe on the outlet of which is arranged a flame stabilizer and within which is arranged at least one central fuel supply pipe and/or a central pipe receiving an ignition burner opening through the stabilizer via an opening, a first external air supply pipe located outside all the other pipes (2, 4, 5, 7) of the burner, delimited by two tubes (8, 9) which are immovable with respect to each other and which immovably bear at their downstream end, a first series of axial ducts that are adapted to confer a null tangential component to air moving therein, and a second external air supply pipe arranged outside the flame stabilizer, delimited by two tubes (9, 14) which are axially mobile with respect to each other, the tube which internally delimits the second external pipe immovably bearing, at its downstream end, a second series of open ducts that are adapted to confer a variable tangential component to air moving therein, each duct of the second series exhibiting, with respect to the burner axis, a tangential deflection that decreases from its upstream end towards its downstream end, the tube externally delimiting the second external pipe comprising a drive portion radially diverging from upstream to downstream such that the tangential deflection angle of air at the downstream end of the second external pipe depends on the relative axial position of the drive portion with respect to the ducts of the second series, all air circulating in the external pipes (6, 7) when exiting from the two series of ducts (10, 15), characterized in that it comprises a series of obstruction walls arranged upstream, at a distance and facing the ducts of the first series, forming baffles adapted to cause part of the air circulating in the first external pipe to circulate along the annular wall in which the inlet orifices of the ducts of the first series are made. a central air supply pipe on the outlet of which is arranged a flame stabilizer and within which is arranged at least one central fuel supply pipe and/or a central pipe receiving an ignition burner opening through the stabilizer via an opening, a first external air supply pipe located outside all the other pipes (2, 4, 5, 7) of the burner, delimited by two tubes (8, 9) which are immovable with respect to each other and which immovably bear at their downstream end, a first series of axial ducts that are adapted to confer a null tangential component to air moving therein, and a second external air supply pipe arranged outside the flame stabilizer, delimited by two tubes (9, 14) which are axially mobile with respect to each other, the tube which internally delimits the second external pipe immovably bearing, at its downstream end, a second series of open ducts that are adapted to confer a variable tangential component to air moving therein, each duct of the second series exhibiting, with respect to the burner axis, a tangential deflection that decreases from its upstream end towards its downstream end, the tube externally delimiting the second external pipe comprising a drive portion radially diverging from upstream to downstream such that the tangential deflection angle of air at the downstream end of the second external pipe depends on the relative axial position of the drive portion with respect to the ducts of the second series, all air circulating in the external pipes (6, 7) when exiting from the two series of ducts (10, 15), characterized in that it comprises a series of obstruction walls arranged upstream, at a distance and facing the ducts of the first series, forming baffles adapted to cause part of the air circulating in the first external pipe to circulate along the annular wall in which the inlet orifices of the ducts of the first series are made.