Liquid fuel swirler
A flow directing device for imparting swirl on a fluid includes a flow directing body having an inboard surface and opposed outboard surface. A flow channel is defined in the outboard surface of the flow directing body for conducting fluids flowing through the flow directing body. The flow channel includes a channel floor and a sidewall extending from the channel floor to the outboard surface of the flow directing body. A swirl port extends from the sidewall of the flow channel though the flow directing body to the inboard surface of the flow directing body for mitigating pressure loss when discharging fluid from the flow channel.
1. An injector for producing an atomized spray of liquid comprising: a) an annular injector body; b) a first annular flow directing body mounted inboard of the injector body, the first flow directing body including an inboard surface and opposed outboard surface, wherein a plurality of flow channels are defined in the outboard surface of the first flow directing body for conducting fluids flowing through the first flow directing body, wherein each flow channel includes a channel floor spaced apart from the outboard surface and a sidewall extending from the channel floor to the outboard surface of the first flow directing body, and wherein a swirl port extends through the sidewall of each flow channel and though the first flow directing body to the inboard surface thereof; and c) a second annular flow directing body mounted radially inboard of the first flow directing body and including an outboard surface with an annular swirl chamber defined therein for receiving liquid from the swirl ports of the first flow directing body to form a swirling sheet of liquid for atomization downstream of the second flow directing body.
2. An injector as recited in claim 1 , wherein the sidewall of each flow channel is substantially perpendicular to the respective channel floor, and wherein the respective swirl port extends obliquely with respect to the channel floor and sidewall for imparting swirl on a fluid flowing therethrough.
3. An injector as recited in claim 1 , wherein each swirl port includes an antechamber defined in the sidewall of the respective flow channel, and a bore extending from the antechamber through the first flow directing body to the inboard surface thereof.
4. An injector as recited in claim 3 , wherein each antechamber includes a spherical portion.
5. An injector as recited in claim 3 , wherein each antechamber extends inboard from the outboard surface of the first flow directing body and has a depth from the outboard surface of the first flow directing body that is less than that of the respective channel floor.
6. An injector as recited in claim 3 , wherein the bore of each swirl port is cylindrical and wherein an edge is defined at the junction of the respective antechamber and bore that defines a substantially uniform angle between the antechamber and the bore circumferentially around the edge.
7. An injector as recited in claim 6 , wherein the substantially uniform angle is about 45.degree.
8. An injector as recited in claim 1 , wherein each swirl port is defined in a terminus of the respective flow channel, and wherein each swirl port defines a longitudinal axis therethrough that is in plane with a plane bisecting the terminus of the respective flow channel normal to the respective channel floor.
9. An injector as recited in claim 1 , wherein each swirl port defines a longitudinal axis therethrough that is out of plane with a plane bisecting a terminus of the respective flow channel normal to the respective channel floor.
10. An injector as recited in claim 1 , wherein each swirl port defines a longitudinal axis therethrough that forms a complex angle with radial, tangential, and axial components with respect to a main axis of the annular injector body.