AIRBLAST INJECTORS FOR MULTIPOINT INJECTION AND METHODS OF ASSEMBLY

1 . A method of assembling an airblast injector comprising:

forming a fluid passage on an at least one of:

an internal conical surface of a first nozzle component, and

an outer conical surface of a second nozzle component configured and adapted to mate with the first nozzle component to form at least a portion of a fluid circuit therebetween,

wherein the fluid passage is configured and adapted to provide passage for fluid in the fluid circuit between the first and second nozzle components; and

joining the first and second nozzle components together by engaging the second nozzle component within the first nozzle component.

2 . A method of assembling an airblast injector as recited in claim 1 , wherein the step of joining includes engaging the second nozzle component into the first nozzle component in an interference fit.

3 . A method of assembling an airblast injector as recited in claim 1 , wherein the step of forming a fluid passage includes forming a thread around at least a portion of one of the internal conical surface of the first nozzle component and the outer conical surface of the second nozzle component.

4 . A method of assembling an airblast injector as recited in claim 1 , wherein the step of forming a fluid passage includes forming a multiple-start thread around at least a portion of one of the internal conical surface of the first nozzle component and the outer conical surface of the second nozzle component for providing multiple individual outlets for the fluid circuit.

5 . A method of assembling an airblast injector as recited in claim 1 , wherein the step of forming a fluid passage includes forming a thread around at least a portion of the internal conical surface of the first nozzle component.

6 . A method of assembling an airblast injector as recited in claim 1 , wherein the step of forming a fluid passage includes forming a multiple-start thread around the internal conical surface of the first nozzle component for providing multiple individual outlets for the fluid circuit.

7 . A method of assembling an airblast injector as recited in claim 1 , further comprising:

applying braze directly to the joint location on at least one of the first and second nozzle components; and

applying heat to the braze to form a braze joint at the joint location.

8 . A method of assembling an airblast injector as recited in claim 1 , further comprising:

welding the first and second nozzle components together at the joint location to form a weld joint.

9 . An injector comprising:

a fuel distributor with a fluid inlet, and fluid outlet, and a fluid circuit for fluid communication between the fluid inlet and the fluid outlet, wherein the fluid circuit includes a passage defined along a cone.

10 . An injector as recited in claim 9 , wherein the fuel distributor includes an outer distributor ring and an inner distributor ring mounted within the outer distributor ring, wherein the fluid circuit is formed between the inner and outer distributor rings.

11 . An injector as recited in claim 10 , wherein the outer distributor ring includes an internal conical surface with a helically threaded fluid passage defined therein, and wherein the fluid circuit is defined between the helically threaded fluid passage of the internal conical surface of the outer distributor ring and an outer conical surface of the inner distributor ring.

12 . An injector as recited in claim 10 , further comprising a braze joint mounting the inner and outer distributor rings together, wherein the braze joint bounds the fluid circuit for confining fluid flowing therethrough.

13 . An injector as recited in claim 10 , wherein the outer distributor ring includes an internal conical surface with a multiple-start helically threaded fluid passage defined therein, and wherein the fluid circuit is defined between the multiple-start helically threaded fluid passage of the internal conical surface of the outer distributor ring and an outer conical surface of the inner distributor ring.

14 . An injector as recited in claim 10 , further comprising a weld joint mounting the inner and outer distributor rings together, wherein the weld joint bounds the fluid circuit for confining fluid flowing therethrough.

15 . An injector for use in a multipoint fuel injection system comprising:

first and second nozzle components assembled as recited in claim 1 to form a fuel distributor;

an inner heat shield mounted inboard of the second nozzle component for thermal isolation of fuel in the fuel distributor from compressor discharge air inboard of the inner heat shield;

a core air swirler mounted inboard of the inner heat shield for swirling compressor discharge air inboard of the fuel distributor for atomizing fuel issued from the fuel distributor; and

an outer heat shield assembly mounted outboard of the first nozzle component for thermal isolation of fuel in the fuel distributor from compressor discharge air outboard of the fuel distributor.

16 . An injector as recited in claim 15 , wherein the outer heat shield assembly defines an outer air circuit configured and adapted to issue compressor discharge air outboard of fuel issued from the fuel distributor.

17 . An injector as recited in claim 16 , wherein the outer air circuit is configured and adapted to issue a swirl-free flow of air therethrough.

18 . An injector as recited in claim 16 , wherein the outer air circuit is configured and adapted to issue a converging flow of air therethrough to enhance swirl imparted on a flow of compressor discharge air issued from the core air swirler.