| 摘要 |
A burner of the type comprising a first tubular duct (2) having at least an end portion (3) with rectlinear axis (12) including an outflow opening (4), a second tubular duct (5), external and coaxial to the first duct (2) with which it defines a substantially annular free space (6) comprising at one end (7), a corresponding outflow opening (8), surrounding the outflow opening (4) of the first duct (2), and means for feeding in the first duct (2) and in the free space (6), independent fluids including, respectively, a fuel and a comburent or the viceversa, is distinguished by the fact that the outflow opening of the first duct comprises advantageously a surface (9) with axial symmetry countersunk towards the outside of the same duct (2).
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