Nozzle assembly with a central fuel supply and at least one air channel

Abstract

The invention relates to a nozzle assembly for a combustor ( 103 ) of an engine (T), comprising at least one nozzle (D) for injecting fuel into a combustion chamber ( 1030 ) of the combustor ( 103 ), wherein the nozzle (D) comprises a nozzle main body (DR) extending along a nozzle longitudinal axis (L) and having a nozzle head (DK), and a nozzle holder (DH) connected to the nozzle main body (DR) and having at least one fuel supply line ( 1 ). The nozzle main body (DR) comprises a central fuel pipe ( 3 ) extending along the nozzle longitudinal axis (L) and at least two radially spaced-apart air guide channels ( 4, 5 ) on the nozzle head with a respective at least one air outlet opening.

1 . A nozzle assembly for a combustion chamber of an engine, having at least one nozzle for injecting fuel into a combustion space of the combustion chamber, wherein the nozzle comprises a nozzle main body, which extends along a nozzle longitudinal axis and has a nozzle head, and a nozzle bracket, which is connected to the nozzle main body and has at least one fuel feed line,
 wherein   the nozzle main body comprises a central fuel pipe that extends along the nozzle longitudinal axis, and at least two radially mutually spaced air-guiding ducts each having at least one air outlet opening are provided on the nozzle head.   
     
     
         2 . The nozzle assembly as claimed in  claim 1 ,
 wherein   the fuel pipe protrudes with its fuel outlet opening axially, with respect to the nozzle longitudinal axis, beyond the air outlet openings.   
     
     
         3 . The nozzle assembly as claimed in  claim 1 ,
 wherein   an outer air outlet opening of a radially outermost air-guiding duct of the at least two air-guiding ducts has a larger cross-sectional area than an inner air outlet opening of an inner air-guiding duct of the at least two air-guiding ducts, which inner air-guiding duct extends on the nozzle head between the radially outermost air-guiding duct and a portion of the fuel pipe.   
     
     
         4 . The nozzle assembly as claimed in  claim 3 ,
 wherein   the outer air outlet opening has a cross-sectional area which is larger than that of the inner air outlet opening by at least a factor of 2.   
     
     
         5 . The nozzle assembly as claimed in  claim 1 ,
 wherein   a radially inner air-guiding duct of the two air-guiding ducts is designed and provided to supply a non-swirling air flow into the combustion space, or the radially inner air-guiding duct is designed and provided to supply into the combustion space an air flow which at least exhibits less reduced swirl in relation to an air flow that is supplied into the combustion space via a radially outermost air-guiding duct of the two air-guiding ducts.   
     
     
         6 . The nozzle assembly as claimed in  claim 1 ,
 wherein   one or more axial or radial swirl-imparting means for air that is to be caused to flow into the combustion space are provided at least in a radially outermost air-guiding duct of the at least two air-guiding ducts.   
     
     
         7 . The nozzle assembly as claimed in  claim 1 ,
 wherein   one or more radially inwardly pointing inlet lips are provided at least at a radially outermost air-guiding duct of the at least two air-guiding ducts in order to direct air into the radially outermost air-guiding duct and/or a radially inner air-guiding duct of the two air-guiding ducts.   
     
     
         8 . The nozzle assembly as claimed in  claim 1 ,
 wherein   a radially inner air-guiding duct of the two air-guiding ducts narrows toward its air outlet opening.   
     
     
         9 . A nozzle assembly for a combustion chamber of an engine, in particular as claimed in  claim 1 , having at least one nozzle for injecting fuel into a combustion space of the combustion chamber, wherein the nozzle comprises a nozzle main body, which extends along a nozzle longitudinal axis and has a nozzle head, and a nozzle bracket, which is connected to the nozzle main body and has at least one fuel feed line,
 wherein   the nozzle main body has a central fuel pipe which extends along the nozzle longitudinal axis and in which there is provided at least one centrally arranged flow body, along the outer lateral surface of which fuel that is fed to the fuel pipe can flow in the direction of a fuel outlet opening of the fuel pipe, via which fuel outlet opening the fuel can be introduced into the combustion space.   
     
     
         10 . The nozzle assembly as claimed in  claim 9 ,
 wherein   the flow body extends with one end as far as a nozzle end of the nozzle.   
     
     
         11 . The nozzle assembly as claimed in  claim 9 ,
 wherein   an ignition plug is integrated into the fuel pipe, in particular into the flow body, such that the front-side ignition portion of said ignition plug faces toward the combustion chamber.   
     
     
         12 . The nozzle assembly as claimed in  claim 11 ,
 wherein   the ignition plug is received in a central cavity of the flow body.   
     
     
         13 . The nozzle assembly as claimed in  claim 11 ,
 wherein   a cable connection for the electrical actuation of the ignition plug is led through the flow body, optionally through a bearing element, in particular supporting strut, of a bearing structure that holds said flow body in the fuel pipe, and through the nozzle bracket.   
     
     
         14 . The nozzle assembly as claimed in  claim 11 ,
 wherein   the flow body that is of blunt form in the direction of the combustion chamber, the region of the fuel outlet opening, and the region of at least one air outlet opening of at least one air-guiding duct that is arranged in particular in the nozzle body, are designed and coordinated with one another such that the feed of air and the feed of gas into the combustion chamber lead to a recirculation of the gas-air mixture toward the ignition portion of the ignition plug.   
     
     
         15 . The nozzle assembly as claimed in  claim 1 ,
 wherein   the flow body has an end which faces toward the combustion space and which has a guide element by means of which fuel that emerges at the fuel outlet opening is directed outward radially with respect to the nozzle longitudinal axis.   
     
     
         16 . The nozzle assembly as claimed in  claim 9 ,
 wherein   the flow body has an end face which faces toward the combustion space and which is blunt at least in certain regions.   
     
     
         17 . The nozzle assembly as claimed in  claim 16 ,
 wherein   the end face is substantially planar, convex or concave at least in certain regions.   
     
     
         18 . The nozzle assembly as claimed in  claim 9 ,
 wherein   the flow body causes the fuel outlet opening to be formed as an annular gap, and/or locally narrowed, at the nozzle end.   
     
     
         19 . The nozzle assembly as claimed in  claim 9 ,
 wherein   the flow body is of pin-like or conical form.   
     
     
         20 . The nozzle assembly as claimed in  claim 9 ,
 wherein   the flow body is symmetrical with respect to the nozzle longitudinal axis, in particular rotationally symmetrical with respect to the nozzle longitudinal axis.   
     
     
         21 . The nozzle assembly as claimed in  claim 9 ,
 wherein   the flow body is connected to an end wall of the nozzle or to a rear wall of the fuel pipe.   
     
     
         22 . The nozzle assembly as claimed in  claim 9 ,
 wherein   two flow bodies that are spaced from one another axially with respect to the nozzle longitudinal axis are provided within the fuel pipe.   
     
     
         23 . The nozzle assembly as claimed in  claim 9 ,
 wherein   the flow body comprises a plurality of protruding portions on its outer lateral surface.   
     
     
         24 . The nozzle assembly as claimed in  claim 9 ,
 wherein   the flow body comprises a plurality of depressions on its outer lateral surface.   
     
     
         25 . The nozzle assembly as claimed in  claim 1 ,
 wherein   the fuel pipe has, at the fuel outlet opening, an edge which encircles the nozzle longitudinal axis and which has a radially outwardly inclined bevel.   
     
     
         26 . The nozzle assembly as claimed in  claim 25 ,
 wherein   the bevel tapers to a point, or transitions into a blunt end geometry, at an axial end of the fuel pipe.   
     
     
         27 . The nozzle assembly as claimed in  claim 1 ,
 wherein   the fuel pipe is sealed off to prevent an inflow of air.   
     
     
         28 . The nozzle assembly as claimed in  claim 1 ,
 wherein   the nozzle is designed and provided to inject gaseous fuel, in particular hydrogen.   
     
     
         29 . An annular combustion chamber having at least one nozzle assembly constructed as claimed in  claim 1 , in a combustion chamber ring. 
     
     
         30 . The annular combustion chamber as claimed in  claim 29 ,
 wherein   an ignition plug is integrated into at least one nozzle assembly, in particular at the highest point of the combustion chamber ring, into a plurality of nozzle assemblies, or into all nozzle assemblies.   
     
     
         31 . An engine having at least one nozzle assembly as claimed in  claim 1 .