Multi-channel distributed series finger-shaped oil supply header pipe and afterburner

Abstract

The invention relates to the technical field of oil supply assemblies in afterburner components of aero-engines, in particular to a multi-channel distributed series finger-shaped oil supply header pipe and an afterburner. The multi-channel distributed series finger-shaped oil supply header pipe comprises a body, and a plurality of fuel oil channels are formed in the body; the upper end of the fuel oil channel penetrates through the top surface of the body; each fuel oil channel is correspondingly provided with a plurality of main fuel oil injection holes, the main fuel oil injection holes are communicated with the fuel oil channels, and the axes of the main fuel oil injection holes are perpendicular to the central axis of the body; the plurality of main fuel injection holes in each fuel channel are arranged at intervals from top to bottom; a plurality of bypass oil injection holes are formed in the position close to the main oil injection hole, and the bypass oil injection holes are communicated with the main oil injection hole through connecting holes; the main oil injection hole, the bypass oil injection hole and the connecting hole are all formed in the body.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel supply components in the afterburner of an aeroengine, and particularly to a multi-channel distributed series finger-shaped fuel supply manifold and an afterburner. Background Art

[0002] When the engine afterburner works, the fuel required for combustion is supplied into the combustion chamber through fuel injection rods at different circumferential positions. To avoid local rich fuel supply, the radial spatial distribution condition of the incoming flow oxygen concentration is matched at the radial position of the fuel injection rod, and fuel injection holes are opened along the radial position of the fuel injection rod to deliver the supplied fuel to different circumferential and radial positions. The fuel is atomized once through the fuel supply pressure. After injection, the fuel is secondarily broken under the impact of the mainstream and then mixed with the air flow and further combusted behind the stabilizer component.

[0003] Existing radially arranged flame stabilizers mostly match direct-injection finger-shaped fuel injection rod assemblies. The fuel injection rod assembly usually sets multiple different fuel supply flow channels according to the design methods of main fuel supply and auxiliary fuel supply, and arranges the fuel supply points at different radial positions of the finger-shaped fuel injection rod according to the calculation and analysis results of the fuel concentration field. Considering the limited matching and adaptation ability of the single-point direct injection nozzle at the radial position to the changes in air flow parameters and oxygen concentration distribution under wide-range incoming flow conditions, it is often impossible to ensure the ideal uniform distribution of fuel in the local space within a wide range of operating condition parameters. Summary of the Invention

[0004] The main object of the present invention is to propose a multi-channel distributed series finger-shaped fuel supply manifold and an afterburner, so that the oil-gas distribution of fuel in the radial space and local space is more reasonable, aiming to solve the above technical problems.

[0005] To achieve the above object, on the one hand, the present invention proposes a multi-channel distributed series finger-shaped fuel supply manifold, including a body, and a plurality of fuel channels are opened inside the body; the upper ends of the fuel channels penetrate through the top surface of the body; each fuel channel is correspondingly provided with a plurality of main fuel injection holes, the main fuel injection holes are communicated with the fuel channels, and the axes of the main fuel injection holes are perpendicular to the central axis of the body; the plurality of main fuel injection holes on each fuel channel are arranged at intervals from top to bottom; a plurality of bypass fuel injection holes are arranged at positions close to the main fuel injection holes, and the bypass fuel injection holes are communicated with the main fuel injection holes through connection holes; the main fuel injection holes, bypass fuel injection holes, and connection holes are all opened on the body.

[0006] Preferably, the lower ends of the fuel channels penetrate through the bottom surface of the body and form fuel injection ports.

[0007] Preferably, two bypass fuel injection holes are correspondingly arranged for each main fuel injection hole, and the two bypass fuel injection holes are respectively located on the upper and lower sides of the main fuel injection hole.

[0008] Preferably, the axis of the bypass fuel injection hole is parallel to the axis of the main fuel injection hole.

[0009] Preferably, the diameter of the bypass fuel injection hole is smaller than that of the main fuel injection hole.

[0010] Preferably, the diameter of the fuel passage gradually decreases from top to bottom; the body is an inverted conical column structure that is larger at the top and smaller at the bottom.

[0011] Preferably, a mounting seat is integrally formed on the outer cylindrical surface of the upper part of the body.

[0012] Preferably, an inlet nozzle is installed at the inlet of each fuel passage for introducing fuel into the fuel passage.

[0013] Preferably, the body, the fuel passage, the main fuel injection hole, the bypass fuel injection hole, and the connection hole inside it are integrally formed by 3D additive manufacturing.

[0014] On the other hand, the present invention provides an afterburner, which includes the above multi-channel distributed series finger-shaped fuel supply manifold for the afterburner.

[0015] Due to the adoption of the above technical solutions, the beneficial effects of the present invention are as follows:

[0016] (1) In the present invention, each fuel passage is correspondingly provided with a plurality of main fuel injection holes, and the plurality of main fuel injection holes on each fuel passage are spaced apart from top to bottom. At the same time, a plurality of bypass fuel injection holes are provided near each main fuel injection hole. Therefore, the fuel entering from the fuel passage can be ejected through both the main fuel injection holes and the bypass fuel injection holes connected to the main fuel injection holes. Therefore, by using this fuel supply manifold, inside the afterburner, the fuel-air distribution in the radial space and local space can be made more reasonable, thereby enhancing the combustion efficiency.

[0017] (2) The multi-channel distributed series finger-shaped fuel supply manifold provided by the present invention forms multiple sets of fuel supply structures within the same body. Each set of fuel supply structures includes a fuel passage, and a plurality of main fuel injection holes and bypass fuel injection holes are correspondingly provided for this fuel passage. Each set of fuel supply structures can transport and eject the fuel in a split manner. When a failure such as blockage occurs in one of the sets of fuel supply structures, the remaining fuel supply structures can still operate normally, increasing the working stability.

[0018] (3) In the present invention, multiple sets of fuel supply structures are formed within the same body, which is conducive to realizing partitioned and pressure-divided fuel supply in the afterburner to form a reasonable fuel distribution and obtaining a higher combustion efficiency.

[0019] (4) In the present invention, by arranging a plurality of bypass injection holes near each main injection hole, the fuel distribution area is widened, making the fuel distribution more uniform, which is beneficial to improving the combustion efficiency. Further, while each main injection hole injects fuel, the bypass injection holes can also divert and eject the fuel of the main injection hole, broadening the fuel reach area and solving the problem of insufficient fuel penetration depth and low combustion efficiency at the minimum fuel flow rate of the afterburner.

[0020] (5) In the present invention, by arranging a plurality of bypass injection holes near each main injection hole, the flow rate number of each fuel passage can be increased, and good fuel distribution can be obtained under a small fuel supply pressure difference, solving the problem of too high fuel supply pressure at the maximum fuel flow rate of the afterburner.

[0021] (6) Therefore, by using this fuel supply manifold, when supplying fuel to the inside of the afterburner, the oil-gas distribution of the fuel in the radial space and the local space is more reasonable, improving the oil-gas mixture distribution in the local fuel supply sub-space and solving the problem that the regional fuel supply concentration is easily affected by the oncoming flow conditions and the oxygen concentration, and the ideal oil-gas space distribution cannot be obtained. Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0023] Figure 1 Schematic structural diagram of the multi-channel distributed series finger-shaped fuel supply manifold provided by the present invention;

[0024] Figure 2 Schematic working principle diagram of the multi-channel distributed series finger-shaped fuel supply manifold provided by the present invention;

[0025] Figure 3 Enlarged view of the working principle of the multi-channel distributed series finger-shaped fuel supply manifold provided by the present invention.

[0026] Explanation of the reference numerals in the drawings: 1, body; 1a, mounting seat; 2, fuel passage; 2a, injection port; 3, main injection hole; 4, bypass injection hole; 5, connection hole; 6, fuel inlet nozzle. Detailed Embodiments

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0028] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0029] As shown in the accompanying drawings, on the one hand, this embodiment provides a multi-channel distributed series finger-shaped fuel supply manifold, including a body 1, and two fuel channels 2 are opened inside the body 1; the upper ends of the fuel channels 2 penetrate the top surface of the body 1; each fuel channel 2 is correspondingly provided with a plurality of main injection holes 3, the main injection holes 3 are communicated with the fuel channels 2, and the axes of the main injection holes 3 are perpendicular to the central axis of the body 1; the plurality of main injection holes 3 on each fuel channel 2 are arranged at intervals from top to bottom; a plurality of bypass injection holes 4 are arranged at positions close to the main injection holes 3, and the bypass injection holes 4 are communicated with the main injection holes 3 through connection holes 5; the main injection holes 3, bypass injection holes 4, and connection holes 5 are all opened on the body 1.

[0030] Combined Figure 1 As shown, the lower ends of the fuel channels 2 penetrate the bottom surface of the body 1 and form injection ports 2a for spraying fuel towards the center of the afterburner.

[0031] In this embodiment, each main injection hole 3 is correspondingly provided with two bypass injection holes 4, and these two bypass injection holes 4 are respectively located on the upper and lower sides of the main injection hole 3. Further, the axes of the bypass injection holes 4 are parallel to the axis of the main injection hole 3. The main function of the bypass injection holes 4 is to more finely disperse the fuel to local sub-space positions, that is, the bypass injection holes 4 are used to spray the fuel to the upper and lower area positions of the main injection hole 3 to improve the distribution of the oil-gas mixture in the local fuel supply sub-space. In this embodiment, the diameter of the bypass injection holes 4 is smaller than the diameter of the main injection holes 3 to ensure that the flow rate of the main injection holes 3 is greater than the flow rate of the bypass injection holes 4. By arranging multiple bypass injection holes 4 beside each main injection hole 3 in the fuel channels 2, the radially fuel injection points supply fuel to more finely disperse to local sub-space positions, improving the distribution of the oil-gas mixture in the local fuel supply sub-space, and solving the problem that the regional fuel supply concentration is easily affected by the oncoming flow conditions and oxygen concentration and the ideal distribution of the oil-gas space cannot be obtained.

[0032] Combined with Figure 1 As shown, the diameter of the fuel passage 2 gradually decreases from top to bottom. The body 1 is an inverted conical column structure with a larger upper part and a smaller lower part.

[0033] Combined with Figure 1 As shown, an installation seat 1a is integrally formed on the outer cylindrical surface of the upper part of the body 1, which is used to install the entire multi-channel distributed series finger-shaped fuel supply main pipe in the afterburner chamber.

[0034] In this embodiment, an inlet nozzle 6 is installed at the fuel inlet of each fuel passage 2, which is used to introduce fuel into the fuel passage 2.

[0035] In this embodiment, due to the complex structure inside the body 1, it cannot be processed by conventional processes. Therefore, the body 1 and its internal fuel passage 2, main injection hole 3, bypass injection hole 4, and connection hole 5 are integrally formed by 3D additive manufacturing.

[0036] On the other hand, this embodiment also provides an afterburner chamber, which includes the above multi-channel distributed series finger-shaped fuel supply main pipe.

[0037] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structural transformation made under the inventive concept of the present invention, or direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A multi-channel distributed series finger-shaped oil supply main pipe, characterized in that: The invention comprises a main body (1), wherein a plurality of fuel channels (2) are provided inside the main body (1); the upper ends of the fuel channels (2) penetrate the top surface of the main body (1); each fuel channel (2) is provided with a plurality of main injection holes (3), the main injection holes (3) are connected to the fuel channel (2), and the axes of the main injection holes (3) are perpendicular to the central axis of the main body (1); the plurality of main injection holes (3) on each fuel channel (2) are arranged at intervals from top to bottom; a plurality of bypass injection holes (4) are provided near the main injection holes (3), and the bypass injection holes (4) are connected to the main injection holes (3) through connecting holes (5); the main injection holes (3), the bypass injection holes (4) and the connecting holes (5) are all provided on the main body (1).

2. A multi-channel distributed series finger-shaped oil supply manifold as claimed in claim 1, characterized in that: The lower end of the fuel channel (2) passes through the bottom surface of the body (1) and forms a fuel injection port (2a).

3. A multi-channel distributed series finger-shaped oil supply manifold as claimed in claim 1, characterized in that: Two bypass oil injection holes (4) are correspondingly arranged for each main oil injection hole (3), and the two bypass oil injection holes (4) are respectively located on the upper and lower sides of the main oil injection hole (3).

4. A multi-channel distributed series finger-shaped oil supply manifold as claimed in claim 1, characterized in that: The axis of the bypass oil injection hole (4) is parallel to the axis of the main oil injection hole (3).

5. A multi-channel distributed series finger-shaped oil supply manifold as claimed in claim 1, characterized in that: The diameter of the bypass oil injection hole (4) is smaller than the diameter of the main oil injection hole (3).

6. A multi-channel distributed series finger-shaped oil supply manifold as claimed in claim 1, characterized in that: The diameter of the fuel channel (2) gradually decreases from top to bottom; and the body (1) is an inverted conical column structure that is larger at the top and smaller at the bottom.

7. A multi-channel distributed series finger-shaped oil supply manifold as claimed in claim 1, characterized in that: A mounting seat (1a) is integrally formed on the outer cylindrical surface of the upper part of the main body (1).

8. A multi-channel distributed series finger-shaped oil supply manifold as claimed in claim 1, characterized in that: An oil inlet nozzle (6) is installed at the oil inlet of each fuel channel (2) for introducing fuel into the fuel channel (2).

9. A multi-channel distributed series finger-shaped oil supply manifold as claimed in claim 1, characterized in that: The main body (1) and the fuel channel (2), main fuel injection hole (3), bypass fuel injection hole (4), and connecting hole (5) therein are integrally formed by 3D additive manufacturing.

10. An afterburner, characterized in that: A multi-channel distributed serial finger-shaped oil supply main pipe comprising any one of claims 1 to 9.

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