Fuel nozzle for burner construction
AssigneeUnited Technologies Corporation
InventorsStanley J. Markowski, Robert P. Lohmann
Life of this patent
Estimating the term…
Abstract
In a two stage burner construction in which primary fuel burns in an annulus in a primary combustion zone and secondary fuel is discharged through the primary zone to a secondary zone downstream of the primary zone, vortex generators are used in the passage through which the fuel and air entering the primary zone to enhance the mixing and to improve the toroidal flow in the combustion zone. Other vortex generators are used to improve the mixing of the secondary fuel and air to improve secondary combustion. The vortex generators may be used in conjunction with a trip on the secondary nozzle tube to further enhance primary combustion.
Claims13
A burner construction including:
- an inlet end cap;
- sidewalls extending downstream from the cap to define a primary combustion zone, said walls converging in a downstream direction at a point spaced from the cap to define a throat and diverging again downstream of the throat to define a secondary combustion zone;
- an annular primary nozzle in the end cap for directing air and fuel at a large angle relative to the axis of the burner into the primary zone adjacent to the cap, said nozzle including an annular discharge fuel path and a surrounding ring having an inturned end flange and forming an annular air path;
- a secondary nozzle within the annular nozzle for directing fuel and air at a small angle and substantially parallel to the burner axis, this small angle and the spacing of the throat from the cap being such that substantially all the fuel passes through the throat;
- and
- vortex generating vanes positioned on the flange on said ring to create vortices in the air in said air path.
A burner construction including:
- an annular duct;
- a burner within the duct including
- an end cap,
- sidewalls extending downstream from the end caps in spaced relation to each other to form a primary combustion zone close to said cap,
- said sidewalls converging in a downstream direction at a point spaced from the cap to form a throat, and diverging again to define a secondary zone;
- an annular primary nozzle in the end cap and constructed to discharge fuel and air in an annulus at a steep angle to the burner axis, said nozzle including an annular fuel discharge path and a surrounding annular air path;
- a secondary nozzle within the annular primary nozzle and extending beyond the primary nozzle, said secondary nozzle being constructed to deliver a mixture of fuel and air axially of the burner and at a small angle so as to enter the throat;
- and
- vortex generating vanes positioned in said annular path adjacent to the discharge end.
A burner construction including:
- an annular duct;
- a burner within the duct including
- an end cap,
- sidewalls extending downstream from the end caps in spaced relation to each other to form a primary combustion zone close to said cap,
- said sidewalls converging in a downstream direction at a point spaced from the cap to form a throat, and diverging again to define a secondary zone;
- an annular primary nozzle in the end cap and constructed to discharge fuel and air in an annulus at a steep angle to the burner axis, said nozzle including an annular fuel discharge path and a surrounding annular air path;
- a secondary nozzle within the annular primary nozzle and extending beyond the primary nozzle, said secondary nozzle being constructed to deliver a mixture of fuel and air axially of the burner and at a small angle so that substantially all the fuel enters the throat;
- and
- turbulence creating means positioned adjacent to the discharge end of the annular air path to create turbulence in the primary air discharging therefrom.
Dependencies are inferred from the claim text.