Burner with axial swirler and method for operating said burner

摘要

The present invention relates to an axial swirler (43), in particular for premixing of oxidizer and fuel in gas turbines. The swirler comprises (43) a series of swirl vanes (3) with a streamline cross-section, wherein each swirl vane (3) has a leading edge (38), a trailing edge (39), and a suction side (31) and a pressure side (32) extending each between said leading and trailing edges (38,39). The swirl vanes (3) are arranged around a swirler axis (47), wherein said leading edges (38) extend essentially in radial direction. Flow slots (33) are formed between the suction side (31) of each swirl vane (3) and the pressure side (32) of its nearest neighboring swirl vane (3). Furthermore, at least one swirl vane (3) has a discharge flow angle between a tangent to its camber line at its trailing edge (39) and the swirler axis (47) that is monotonically increasing with increasing radial distance from the swirler axis (47). The invention also relates to a burner with such a swirler and a method of operating said burner.