The burner according to the invention comprises an injection device able to inject a flow of gaseous fuel mixture in a head of a burner comprising in succession: a pressure recovery chamber 10 having a diverging profile, an ignition chamber 11 having two parallel walls 18, 19 prolonged by two deflectors 30, 31, the edges previous form between them a passage of reduced width, and a diffusion grid forming between the two chambers a partition bombee. The edges of the cars deflectors 30, 31 and the diffusion grid present of circular shape, substantially coaxial. / p & & p & the invention makes it possible to avoid the discontinuities of the shape of the front edge of the flame and the incidences adverse defects in orientation of the burner.
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