Device and method for injecting fuels into compressed gaseous media
First Claim
1. A method for operating a fuel injector for atomization of the fuel, the fuel injector having a cylindrical hollow body having an outlet port, the outlet opening forming an atomization edge, the body defining an interior swirl chamber having an axial flow direction leading to the outlet port, the swirl chamber having a cone-shaped portion narrowing toward the outlet port, the body further defining an air duct with a mouth connecting to an upstream end of the swirl chamber, the body defining at least one fuel feed passage to guide fuel into the body and at least one inlet opening leading laterally from the at least one fuel feed passage to the swirl chamber downstream of the mouth, and the body having a dividing wall extending axially downstream from the mouth at least to a center of the at least one inlet opening, the method comprising the steps of:
- feeding fuel through the inlet opening into the swirl chamber, wherein a swirling film flow of fuel is produced on a surface of the swirl chamber; and
introducing atomization air from the air duct into the swirl chamber;
wherein, the fuel film upon reaching the atomization edge is broken into droplets, and wherein the atomization air applies additional shear forces to the fuel film and assists the break-up of the fuel into droplets.
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Accused Products
Abstract
A device for injecting fuels (4) into compressed gaseous media essentially comprises a cylindrical hollow body (24) with at least one fuel feed passage (2) and means for the introduction of compressed atomization air (5). A swirl chamber (1) is arranged in the interior of the hollow body (24), this swirl chamber being connected via at least one inlet opening (6) to the fuel feed passage (2). The cross-section of the swirl chamber (1) narrows in the direction of flow of the atomization air passed through the interior of the hollow body (24), thereby forming a cone (8). A dividing wall (20), which extends downstream at least as far as the center of the inlet openings (6), is arranged upstream of the swirl chamber (1), between the fuel in the swirl chamber (1) and the atomization air (5). A method for operating the device is furthermore described.
100 Citations
8 Claims
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1. A method for operating a fuel injector for atomization of the fuel, the fuel injector having a cylindrical hollow body having an outlet port, the outlet opening forming an atomization edge, the body defining an interior swirl chamber having an axial flow direction leading to the outlet port, the swirl chamber having a cone-shaped portion narrowing toward the outlet port, the body further defining an air duct with a mouth connecting to an upstream end of the swirl chamber, the body defining at least one fuel feed passage to guide fuel into the body and at least one inlet opening leading laterally from the at least one fuel feed passage to the swirl chamber downstream of the mouth, and the body having a dividing wall extending axially downstream from the mouth at least to a center of the at least one inlet opening, the method comprising the steps of:
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feeding fuel through the inlet opening into the swirl chamber, wherein a swirling film flow of fuel is produced on a surface of the swirl chamber; and introducing atomization air from the air duct into the swirl chamber; wherein, the fuel film upon reaching the atomization edge is broken into droplets, and wherein the atomization air applies additional shear forces to the fuel film and assists the break-up of the fuel into droplets. - View Dependent Claims (2, 3, 4)
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- 5. A fuel injection nozzle for atomizing liquid fuel, comprising a cylindrical hollow body having an outlet port, the body defining an interior swirl chamber having an axial flow direction leading to the outlet port, the swirl chamber having a cone-shaped portion narrowing toward the outlet port, the body further defining an air duct with a mouth connecting to an upstream end of the swirl chamber, the body defining at least one fuel feed passage to guide fuel into the body and at least one inlet opening leading laterally from the at least one fuel feed passage to the swirl chamber downstream of the mouth, and the body having a dividing wall extending axially downstream from the mouth at least to a center of the at least one inlet opening to separate fuel entering the swirl chamber from atomization air entering the swirl chamber to allow a fuel film to form on the swirl chamber.
Specification