Size scaling of a burner

Abstract

A method for upscaling the size of a burner of a gas turbine engine including a burner housing is provided. The burner is provided with a mixture of fuel and air at an upstream end from a premixing channel that sustains a main flame at a downstream end of the burner. The premixing channel is defined at the exit by a circular inner wall formed by an inner quarl section and a circular outer wall formed by an outer quarl section. The burner may be increased in size by adding a quarl section outside and circumferentiating the quarl section and forming an annular space between the added quarl section and the existing outer quarl section and by adding a premixing channel defined at the exit by a circular inner wall formed by the previously outmost quarl section and the circular outer wall formed by the added quarl section.

1 .- 4 . (canceled) 
     
     
         5 . A method for upscaling the size of a burner of a gas turbine engine including a burner housing, the method comprising:
 providing a burner, the burner comprising:
 axially opposed upstream and downstream end portions, and 
 a first premixing channel including a first exit whereby the first premixing channel is defined at the first exit by a first circular inner wall formed by an inner first quarl section, and a first circular outer wall formed by an outer second quarl section, 
   increasing a size of the burner by adding a third quarl section outside and surrounding the outer second quarl section, thus forming in a first annular space between the added third quarl section and the existing outer second quarl section, a second premixing channel including a second exit whereby the second premixing channel is defined at the second exit by a second circular inner wall formed by the outmost second quarl section and a second circular outer wall formed by the added third quarl section,   wherein the plurality of quarl sections define a combustion room for housing the main flame of the burner,   wherein the outer quarl section, the second quarl section or the third quarl section, includes a greater diameter than a neighboring inner quarl section, the first quarl section or the second quarl section respectively, and extends a greater distance downstream than the neighboring inner quarl section, the second quad section or the first quarl section, respectively, and   wherein at an upstream end of the burner fuel and air are provided as a mix of air and fuel from the first exit of the first premixing channel for sustaining a main flame at a downstream end of the burner.   
     
     
         6 . The method as claimed in  claim 5 , further comprising:
 increasing the size of the burner by adding a fourth quarl section outside and surrounding the previously outmost third quarl section, thus forming in a second annular space between the added fourth quarl section and the existing outer third quarl section, a third premixing channel defined at a third exit of the third premixing channel by a third circular inner wall formed by a previously outmost third quarl section, and a third circular outer wall formed by the added fourth quarl section,   wherein the plurality of quarl sections define a combustion room for housing the main flame of the burner, and   wherein an outer quarl section, second, third or fourth quarl sections, includes a greater diameter than the neighboring inner quarl section, first, second or third quarl sections, and extends a greater distance downstream than the neighboring inner quarl section, respectively.   
     
     
         7 . The method as claimed in  claim 6 , further comprising:
 arranging the swirl numbers of the mixture of air and fuel provided to the plurality of premixing channels so that the swirl numbers are: S N ,  10 >S N ,  11 >S N ,  11   b,      wherein the swirl numbers should all be above S N =0.6 and not higher then S N =0.8.   
     
     
         8 . A scaleable quarl in a burner for a gas turbine engine, comprising:
 a plurality of quarl sections arranged to house a main flame,   wherein the burner includes axially opposed upstream and downstream end portions,   wherein fuel and air is mixed and provided to the burner whereupon the fuel is burnt in the main flame of the burner,   wherein each quarl section includes a configuration of a conical shell of a truncated cone and is distributed consecutively one after the other in a downstream direction of the burner,   wherein a most narrow part of the shell of a downstream second quarl section, surrounds a widest part of the shell of a closest upstream first quad section,   wherein an annular channel for premixed air and fuel is arranged between two consecutive quarl sections,   wherein each quarl is arranged such that further quarl sections may be added to an existing number of at least two quarl sections, and   wherein each quarl is arranged such that added quarl sections may be removed until a minimum of two quarl sections remain.