Burner comprising a fluidic oscillator, for a gas turbine, and a gas turbine comprising at least one such burner

Abstract

A burner having a pre-mixing passage delimited radially outwardly by a wall, a burner lance and a plurality of fuel injectors arranged in the pre-mixing passage, the injectors extending from the burner lance in the direction of the wall and having fuel nozzles. The fuel supply arrangement has at least one fluidic oscillator that has an interaction chamber, an inlet to the interaction chamber connected to a fuel channel of the fuel supply arrangement, a first outlet channel of the interaction chamber extending at least to a first fuel nozzle and a second outlet channel extending at least to a second fuel nozzle, the fluidic oscillator has one feedback line for each outlet channel, one end of the feedback line terminating into the respective outlet channel downstream of the at least one fuel nozzle, and the other end thereof terminating into an inlet region of the interaction chamber.

1 . A burner comprising:
 a central burner axis and a premix passage enclosing the burner axis at least in sections, the premix passage being bounded radially outward by a wall, being capable of being flowed through during operation by compressor air, and being used to mix fuel and air, there being arranged in the premix passage a burner lance or burner hub and a number of fuel injectors which extend from the burner lance or burner hub in the direction of the wall and comprise fuel nozzles fluidically connected to a fuel feed arrangement at least partially contained by the burner lance or burner hub,   wherein the fuel feed arrangement comprises at least one fluidic oscillator having an interaction chamber, an input of the interaction chamber being connected to a fuel channel of the fuel feed arrangement, and a first output channel of the interaction chamber extending at least to a first fuel nozzle and a second output channel extending at least to a second fuel nozzle, the fluidic oscillator comprising one feedback line per output channel, the feedback line opening with one of its ends into the respective output channel in the region downstream of the at least one fuel nozzle and with the other end into an input region of the interaction chamber.   
     
     
         2 . The burner as claimed in  claim 1 ,
 wherein the first output channel extends to a first group of fuel nozzles and the second output channel extends to a second group of fuel nozzles, the feedback line respectively opening into the respective output channel in a region downstream of the respective group of fuel nozzles.   
     
     
         3 . The burner as claimed in  claim 1 ,
 wherein the feedback line connects to the output channel downstream of the at least one fuel nozzle.   
     
     
         4 . The burner as claimed in  claim 1 ,
 wherein the at least first fuel nozzle and the at least second fuel nozzle are arranged in different fuel injectors.   
     
     
         5 . The burner as claimed in  claim 1 ,
 wherein the two fuel injectors are essentially arranged opposite one another on the burner lance.   
     
     
         6 . The burner as claimed in  claim 4 ,
 wherein the burner comprises more than two groups of fuel nozzles, connected to the fluidic oscillator in this way, in different fuel injectors.   
     
     
         7 . The burner as claimed in  claim 6 ,
 wherein the different fuel injectors are arranged circumferentially on the burner lance, and the associated output channels are arranged circumferentially on the interaction chamber.   
     
     
         8 . The burner as claimed in  claim 1 ,
 wherein the at least one fuel injector comprises a base body, on which the fuel nozzles contained by the fuel injector are arranged.   
     
     
         9 . The burner as claimed in  claim 1 ,
 wherein the interaction chamber comprises the input at one of its ends and an output region at an opposite end, and is bounded by side walls or side-wall regions which extend from the input of the chamber to the output region comprising the outputs, at least two oppositely arranged side walls or side-wall regions diverging in the direction of the output region, at least in the input region.   
     
     
         10 . The burner as claimed in  claim 1 ,
 wherein at least two oppositely arranged side-wall regions diverge in the input region of the interaction chamber in the direction of the output region at an angle of more than 7.5 degrees with respect to an influx direction of the input of the interaction chamber.   
     
     
         11 . The burner as claimed in  claim 1 ,
 wherein the interaction chamber is essentially configured rotationally symmetrically, the interaction chamber widening at least in the input region in the manner of a diffuser in the direction of the output region.   
     
     
         12 . A burner arrangement comprising:
 a number of burners,   with main burners being arranged in one or more circles arranged concentrically with one another,   wherein at least one burner is configured as claimed in  claim 1 .   
     
     
         13 . A combustion chamber for a gas turbine, comprising:
 at least one burner as claimed in  claim 1 .   
     
     
         14 . A gas turbine comprising:
 at least one combustion chamber,   wherein the combustion chamber is configured as claimed in  claim 13 .   
     
     
         15 . The burner as claimed in  claim 8 ,
 wherein the base body comprises a swirl impeller of a swirl generator.