Fuel spraying apparatus of gas turbine engine

1. A fuel spraying apparatus of a gas turbine engine, comprising:

a first fuel spraying section configured to spray fuel for diffusion combustion;

a second fuel spraying section configured to spray fuel for premixed combustion, the second fuel spraying section being disposed so as to surround the first fuel spraying section; and

air curtain generating section disposed between the first fuel spraying section and the second fuel spraying section, the air curtain generating section being configured to generate an air curtain which defines an outer edge of a diffusion combustion area in a combustion chamber,

wherein the second fuel spraying section comprises an inner swirler and an outer swirler,

wherein the second fuel spraying section comprises a premixing chamber that is formed downstream of the outer swirler, the premixing chamber being a chamber that mixes fuel and air within the second fuel spraying section, and

wherein the first fuel spraying section, the second fuel spraying section, the air curtain generating section, and the premixing chamber are all contained within a single nozzle.

2. A fuel spraying apparatus of a gas turbine engine according to claim 1 , wherein the first fuel spraying section comprises a cylindrical main unit having a double-wall structure configured to spray fuel for diffusion combustion, an inner swirler arranged in the cylindrical main unit, a spraying nozzle member configured to define a spray angle of fuel from the cylindrical main unit, and an outer swirler arranged between the cylindrical main unit and the spraying nozzle member.

3. A fuel spraying apparatus of a gas turbine engine according to claim 1 , wherein the first fuel spraying section comprises a closed-end cylindrical main unit configured to spray fuel for diffusion combustion, a nozzle-shaped cylindrical inner peripheral wall into which the closed-end cylindrical main unit is fitted, the nozzle-shaped cylindrical inner peripheral wall being widened toward its distal end, a nozzle-shaped cylindrical intermediate wall arranged outside the cylindrical inner peripheral wall, the nozzle-shaped cylindrical intermediate wall being widened toward its distal end, a spraying nozzle member arranged outside the cylindrical intermediate wall, the spraying nozzle member being widened toward its distal end, an inner swirler arranged between the cylindrical intermediate wall and the spraying nozzle member.

4. A fuel spraying apparatus of a gas turbine engine according to claim 3 , wherein the inner swirler and the outer swirler are configured such that an influence of the inner swirler is lower than an influence of the outer swirler.

5. A fuel spraying apparatus of a gas turbine engine according to claim 2 , wherein an air injecting port of the air curtain generating section is disposed at an outer edge of the spraying nozzle member.

6. A fuel spraying apparatus of a gas turbine engine according to claim 1 , the fuel spraying sections comprise an inside block including a fuel injecting part and an outside block not including a fuel injecting part, the inside block and the outside block being separable from each other.

7. A fuel spraying apparatus of a gas turbine engine according to claim 1 , wherein the fuel spraying sections comprise an inside block including a fuel injecting part and an outside block not including a fuel injecting part, and the inside block and the outside block being integrally formed.

8. A combustor comprising a fuel spraying apparatus of a gas turbine engine as defined in claim 1 .

9. The fuel spraying apparatus according to claim 1 , wherein the premixing chamber is formed directly between a wall of the second fuel spraying section and an outer wall of the apparatus.

10. The fuel spraying apparatus according to claim 1 , wherein the second fuel spraying section further comprises a premixing preliminary chamber formed downstream of the inner swirler.

11. A fuel spraying apparatus of a gas turbine engine, comprising:

a first fuel spraying section configured to spray fuel for diffusion combustion; a second fuel spraying section configured to spray fuel for premixed combustion, the second fuel spraying section being disposed so as to surround the first fuel spraying section; and

air curtain generating section disposed directly between the first fuel spraying section and the second fuel spraying section, the air curtain generating section being configured to generate an air curtain that defines an outer edge of a diffusion combustion area in a combustion chamber, wherein the air curtain generating section comprises an open chamber formed by a wall of the first fuel spraying section and a wall of the second fuel spraying section,

wherein the second fuel spraying section comprises an inner swirler and an outer swirler,

wherein the second fuel spraying section comprises a premixing preliminary chamber that is formed downstream of the inner swirler, and

wherein the first fuel spraying section, the second fuel spraying section, the air curtain generating section, and the premixing chamber are all contained within a single nozzle.

12. The fuel spraying apparatus according to claim 11 , wherein the premixing chamber is formed directly between the wall of the second fuel spraying section and an outer wall of the apparatus and the premixing chamber mixes fuel and air within the second fuel spraying section.

13. The fuel spraying apparatus according to claim 11 , wherein the second fuel spraying section further comprises a premixing preliminary chamber formed downstream of the inner swirler.