Multiphase fuel injector

A method of making a multiphase fuel injector, the method comprising the steps of:

• additively manufacturing an injector body, wherein the injector body includes:
• a fuel inlet at a first end of the injector body and a fuel outlet at a second end of the injector body opposite the first end;
• a primary circuit disposed within the injector body proximate the fuel inlet and extending into a central portion of the injector body, the primary circuit configured to receive a first flow of pressurized fuel from the fuel inlet, the primary circuit having one or more helical primary openings formed in the injector body, the one or more helical primary openings configured to direct the first flow of pressurized fuel to a spin chamber located in the injector body downstream from the fuel inlet, the one or more helical primary openings further configured to impart a swirling motion to the first flow of pressurized fuel;
• and
• a secondary circuit located within the injector body and positioned radially outward from the primary circuit, the secondary circuit configured to receive a second flow of pressurized fuel from the fuel inlet, the secondary circuit having one or more helical secondary openings formed in the injector body, the one or more helical secondary openings configured to direct the second flow of pressurized fuel toward the fuel outlet and to impart a swirling motion to the second flow of pressurized fuel,
• wherein the primary circuit includes a flow plate attached to a biasing spring, wherein the flow plate blocks fuel from flowing into the secondary circuit when the biasing spring is fully extended, and allows fuel to flow into the secondary circuit when the biasing spring is compressed.

A multiphase fuel injector, comprising:

• an injector body having a fuel inlet at a first end of the injector body and a fuel outlet at a second end of the injector body opposite the first end;
• a primary circuit disposed proximate the fuel inlet and extending into a central portion of the injector body, the primary circuit configured to receive a first flow of pressurized fuel from the fuel inlet and discharge the fuel into a spin chamber located in the injector body downstream from the fuel inlet, the primary circuit configured to impart a swirling motion to the first flow of pressurized fuel;
• a secondary circuit located in the injector body radially outward from the primary circuit, the secondary circuit configured to receive a second flow of pressurized fuel from the fuel inlet and discharge the fuel into the fuel outlet, the secondary circuit configured to impart a swirling motion to the second flow of pressurized fuel,
• wherein the primary circuit includes a flow plate attached to a biasing spring, wherein the flow plate blocks fuel from flowing into the secondary circuit when the biasing spring is fully extended, and allows fuel to flow into the secondary circuit when the biasing spring is compressed.