Burner including non-uniformly cooled tetrahedron vortex generators and method for cooling

摘要

The burner (1) for a gas turbine includes a duct (2) housing a plurality of tetrahedron shaped vortex generators (3) and a lance (4) to inject a fuel to be combusted. Within the duct (2), a plurality of vortex generators (3) are provided with a plurality of holes (9) for injecting cooling air. The cooling holes (9) define passing through areas that are non-uniformly distributed on a top wall (11) of the vortex generators (3). A method for locally cooling a hot gases flow passing through a burner includes non-uniformly injecting cooling air from a vortex generator into the hot gas flow in the duct, which can reduce the occurrence of flashback in the burner.

主权项

1. A burner for a gas turbine, the burner comprising:
a duct; a plurality of tetrahedron shaped vortex generators housed in said duct; and a lance positioned downstream of the plurality of vortex generators, the lance being configured and arranged to inject a fuel to be combusted into said duct, at least one of the plurality of vortex generators comprising a tetrahedron-shaped body including a top wall and a plurality of cooling holes configured and arranged to inject cooling air from the body into the duct; wherein there is a greater density of said cooling holes in at least one portion of the top wall as compared to the cooling holes in another portion of the top wall, the different densities of cooling holes define passing through areas that are non-uniformly distributed on the top wall such cores of vortices of fluid generated by the plurality of vortex generators are locally cooled such that fuel that enters the vortices after injection via the lance is withheld within the cores of the vortices and passes through the duct and into a combustion chamber without burning while mixing with fluid within the duct, the mixed fluid and fuel being fed to the combustion chamber via the duct after the lance injects the fuel into the duct such that the fuel burns after being fed into the combustion chamber.