Nozzle comprising axial extension for a combustion chamber of an engine

Abstract

The present invention relates to a nozzle for a combustion chamber ( 3 ) of an engine (T) for providing a fuel-air mixture at a nozzle exit opening of the nozzle ( 2 ). According to the invention, an extension ( 5 ) for guiding the fuel-air mixture extending in the axial direction with respect to a nozzle longitudinal axis (DM) is provided at an air guide element ( 271 b ) of a radially outwardly located air channel ( 27 b ) of the nozzle ( 2 ).

1 . Nozzle for a combustion chamber ( 3 ) of an engine (T) for providing a fuel-air mixture at a nozzle exit opening of the nozzle ( 2 ), wherein the nozzle ( 2 ) comprises a nozzle main body ( 20 ) that comprises the nozzle exit opening and that extends along a nozzle longitudinal axis (DM), and the nozzle main body ( 20 ) further comprises at least the following:
 at least one first, inner air channel ( 26 ) for conveying air to the nozzle exit opening, extending along the nozzle longitudinal axis (DM),   at least one fuel guiding channel ( 25 ) for conveying fuel to the nozzle exit opening that is positioned radially further outside than the first air channel ( 26 ) with respect to the nozzle longitudinal axis (DM), and   at least one further air channel ( 27   b ) that is positioned radially further outside than the fuel guiding channel ( 25 ) with respect to the nozzle longitudinal axis (DM), wherein an air guide element ( 271   b ) for guiding air flowing from the at least one further air channel ( 27   b ) is provided at an end of this at least one further air channel ( 27   b ) that is positioned in the area of the nozzle exit opening,   
       characterized in that 
       an extension ( 5 ) for guiding the fuel-air mixture is provided at the air guide element ( 271   b ) of the at least one further air channel ( 27   b ), extending in the axial direction with respect to the nozzle longitudinal axis (DM). 
     
     
         2 . Nozzle according to  claim 1 , characterized in that the extension ( 5 ) is embodied in a tubular manner. 
     
     
         3 . Nozzle according to  claim 1  or  2 , characterized in that the extension ( 5 ) extends in the axial direction with a length (l 5 ) that is less than 3.5. times a height (H) of the at least one further air channel ( 27   b ) and/or of a swirling element ( 270   b ) that is provided in the at least one further air channel ( 27   b ). 
     
     
         4 . Nozzle according to any of the  claims 1  to  3 , characterized in that the air guide element ( 271   b ) of the at least one further air channel ( 27   b ) has a section at which an inner diameter (D 1 ) of the nozzle exit opening defined by the air guide element ( 271   b ) is minimal, and the extension ( 5 ), as measured from a first reference point (E 1 ) at this section and the location of the minimal inner diameter (D 1 ), extends in the axial direction all the way to a second reference point (E 2 ) that is located at a distance (I) from the first reference point (E 1 ), which
 (a) is at least as large as a height (H) of the at least one further air channel ( 27   b ) and/or of a swirling element ( 270   b ) that is provided inside the at least one further air channel ( 27   b ), and 
 (b) corresponds to maximally 3.5 times this height (H). 
 
     
     
         5 . Nozzle according to any of the preceding claims, characterized in that a radially outwardly located lateral surface of the extension ( 5 ) connects to a radially outwardly located lateral surface of the air guide element ( 271   b ). 
     
     
         6 . Nozzle according to  claim 5 , characterized in that the air guide element ( 271   b ) and the extension ( 5 ) have substantially or exactly the same outer diameter (D 2 ). 
     
     
         7 . Nozzle according to any of the preceding claims, characterized in that an inner lateral surface of the extension ( 5 ) connects in the axial direction to an inner lateral surface of the air guide element ( 271   b ) of the at least one further air channel ( 27 ). 
     
     
         8 . Nozzle according to any of the preceding claims, characterized in that the extension ( 5 ) has at least two sections ( 50 ,  51 ) succeeding each other in the axial direction and having different inner diameters. 
     
     
         9 . Nozzle according to any of the preceding claims, characterized in that an inner diameter is enlarged continuously or with at least one step in the axial direction at least at a section of the extension ( 5 ). 
     
     
         10 . Nozzle according to  claim 9 , characterized in that the at least one section of the extension ( 5 ) has an inner lateral surface that extends so as to be oriented radially outwards with regard to the nozzle longitudinal axis (DM) and/or that is concavely curved. 
     
     
         11 . Nozzle according to any of the  claims 1  to  7 , characterized in that the extension ( 5 ) has an inner diameter that is constant in the axial direction. 
     
     
         12 . Nozzle according to any of the preceding  claims 1  to  10 , characterized in that the extension ( 5 ) widens at least at one end that is located in the axial direction. 
     
     
         13 . Combustion chamber assembly group, with
 a burner seal ( 4 ) that has a bearing section ( 41 ) having a passage opening and extending along the nozzle longitudinal axis (DM), and   a nozzle ( 2 ) according to any of the  claims 1  to  12  that is positioned in the passage opening of the bearing section ( 41 ).   
     
     
         14 . Combustion chamber assembly group according to  claim 13 , characterized in that the extension ( 5 ) of the nozzle ( 2 ) projects beyond the bearing section ( 41 ) in the axial direction. 
     
     
         15 . Combustion chamber assembly group according to  claim 13  or  14 , characterized in that the burner seal ( 4 ) is formed without flow guiding elements ( 40 ). 
     
     
         16 . Engine with at least one nozzle according to any of the  claims 1  to  12  or a combustion chamber assembly group according to any of the  claims 13  to  15 .