Combustor premixer

Abstract

A combustor premixer is provided and includes a burner tube having a bell mouth-shaped opening, a plurality of tubular bodies telescopically disposed within the burner tube to deliver combustible materials to a premixing passage defined between the burner tube and an outermost one of the plurality of tubular bodies and a plurality of swirler vanes arrayed circumferentially in the opening, each one of the plurality of swirler vanes including a body extending along a radial dimension from the burner tube to the outermost tubular body and a leading edge protruding upstream from the opening.

1 . A combustor premixer, comprising:
 a burner tube having a bell mouth-shaped opening;   a plurality of tubular bodies telescopically disposed within the burner tube to deliver combustible materials to a premixing passage defined between the burner tube and an outermost one of the plurality of tubular bodies; and   a plurality of swirler vanes arrayed circumferentially in the opening, each one of the plurality of swirler vanes including a body extending along a radial dimension from the burner tube to the outermost tubular body and a leading edge protruding upstream from the opening.   
     
     
         2 . The combustor premixer according to  claim 1 , wherein the burner tube is formed to define shroud side holes downstream from the plurality of swirler vanes. 
     
     
         3 . The combustor premixer according to  claim 2 , wherein the shroud side holes are located proximate to trailing edges of the plurality of swirler vanes. 
     
     
         4 . The combustor premixer according to  claim 1 , wherein the outermost one of the plurality of tubular bodies diverges in the upstream direction. 
     
     
         5 . The combustor premixer according to  claim 1 , wherein the plurality of tubular bodies delivers combustible materials at the bell mouth-shaped opening and at a secondary location downstream from the bell mouth-shaped opening, and wherein the premixing passage narrows in the downstream direction from the secondary location. 
     
     
         6 . The combustor premixer according to  claim 1 , wherein one or more of the plurality of tubular bodies is formed to define a fuel passage. 
     
     
         7 . The combustor premixer according to  claim 1 , wherein the plurality of tubular bodies includes a centerbody having an interior receptive of a purge air supply. 
     
     
         8 . The combustor premixer according to  claim 1 , wherein each one of the plurality of swirler vanes extends along the radial dimension in a substantially spiral-shaped pattern. 
     
     
         9 . The combustor premixer according to  claim 1 , wherein one or more of each one of the plurality of swirler vanes is angled at a trailing edge thereof. 
     
     
         10 . The combustor premixing according to  claim 1 , wherein a pressure along the premixing passage is substantial uniform. 
     
     
         11 . A combustor premixer, comprising:
 an annular shroud;   an annular wall disposed within the shroud to define premixing and fuel passages, the premixing passage extending downstream from a shroud upstream end and radially inwardly from a divergent point at the shroud upstream end to a convergent point, the fuel passage being configured to deliver fuel to the premixing passage proximate to the divergent point; and   a centerbody having an innermost tube to define an interior passage and being loadable within the wall to define an intermediate passage,   the intermediate passage being fluidly communicative with the interior passage via first holes formed in the innermost tube, the fuel passage via second holes formed in the wall downstream from the first holes, and the premixing passage via third holes formed in the wall downstream from the second holes and proximate to the convergent point.   
     
     
         12 . The combustor premixer according to  claim 11 , further comprising a plurality of swirler vanes disposed at the shroud upstream end, wherein cross-sections of the shroud and the plurality of swirler vanes cooperatively form a dome-shape. 
     
     
         13 . The combustor premixer according to  claim 11 , further comprising a mounting flange upstream from the upstream end, wherein the wall is divergent from the upstream end to the mounting flange and includes an inner wall portion and an outer wall portion that diverges from the inner wall portion at a downstream edge thereof to define the fuel passage. 
     
     
         14 . The combustor according to  claim 13 , wherein the fuel passage delivers fuel to the premixing passage via fuel holes defined in the outer wall portion. 
     
     
         15 . The combustor premixer according to  claim 14 , wherein the fuel holes are arrayed circumferentially about the outer wall portion. 
     
     
         16 . The combustor premixer according to  claim 13 , wherein the second holes are arrayed circumferentially about the inner wall portion at the downstream edge thereof. 
     
     
         17 . The combustor premixer according to  claim 13 , wherein the third holes are arrayed circumferentially about the wall downstream from the downstream edge of the inner wall portion. 
     
     
         18 . The combustor premixer according to  claim 11 , wherein the first holes are arrayed circumferentially about the innermost tube. 
     
     
         19 . The combustor premixer according to  claim 11 , wherein the intermediate passage narrows from the convergent point in the downstream direction. 
     
     
         20 . A combustor premixer, comprising:
 an annular burner tube;   an annular inner wall formed to define a fuel passage; and   a centerbody formed to define an interior,   the burner tube, the inner wall and the centerbody being telescopically arranged such that:   the burner tube and the inner wall define a premixing passage having a convergent upstream end and a downstream portion, the premixing passage being fluidly communicative with the fuel passage at the upstream end,   the inner wall and the centerbody define an intermediate passage having an upstream end and a divergent downstream portion, the intermediate passage being fluidly communicative with the fuel passage and the interior at the upstream end and with the premixing passage at respective borders of corresponding upstream ends and downstream portions; and the combustor premixer further comprising:   a plurality of swirler vanes arrayed circumferentially in the premixing passage, each one of the plurality of swirler vanes including a body extending along a radial dimension from the burner tube to the inner wall and a leading edge protruding upstream from an opening of the premixing passage.