The invention relates to a burner (1) comprising an annular circuit (2) for transporting fuel delimited by an internal tube (3) and an external tube (4) substantially concentric along a longitudinal axis (X), said circuit having: - an upstream part (2A) and a downstream part (2B) in the direction of flow of the fuel ending in an open end (2C), - a distance (S) between the internal tube (3) and the external tube (4 ) variable between the upstream part (2A) and the downstream part (2B) of said annular circuit (2), the burner (1) further comprising a deflection element (5) configured to impart a radial component to a fuel moving in said annular circuit (2) from the upstream part (2A) towards the open end (2C). According to the invention, said deflection element (5) is movable in translation between the upstream part (2A) and the downstream part (2B). Figure for the abstract: Fig 4
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