An integrated air-cooled direct injection spray boom

Abstract

This application belongs to the field of afterburner spray bars for aeroengines, and particularly relates to an integrated air-cooled direct spray bar. It includes: a diffuser casing 5, a spray bar body 1, and a heat shield 2. In the integrated air-cooled direct spray bar of this application, a circular cold air inlet 3 is provided in front of the heat shield 2, and a long strip-shaped cooling outlet 4 is arranged from top to bottom behind the heat shield 2. The cooling gas in the outer bypass channel enters the cooling cavity between the spray bar body 1 and the heat shield 2 through the cold air inlet 3, isolating the spray bar body 1 from the high-temperature combustion gas in the core, and effectively reducing the temperature of the spray bar body 1. At the same time, due to the airflow in the engine core, a low-pressure area is formed behind the heat shield 2. The long strip-shaped cooling outlet 4 can timely discharge the cooling gas inside the cooling cavity, making full use of the low-pressure area to realize the renewal of the internal cooling gas and preventing the internal airflow from stagnating or the high-temperature combustion gas from flowing back.

Description

Technical Field

[0001] This application belongs to the field of afterburner spray bars of aeroengines, and particularly relates to an integrated air-cooled direct spray bar. Background Art

[0002] The afterburner spray bar is an important part of the fuel supply system of the afterburner. Its main function is to provide atomized fuel for the afterburner to organize combustion. As the turbine outlet temperature gets higher and higher, the thermal load of the afterburner spray bar becomes larger and larger. The single bare-bar afterburner spray bar is prone to external ablation and internal coking problems, and can no longer meet the requirements of more advanced engines. For traditional spray bars with air cooling, in order to meet the air cooling requirements, an insulation cover needs to be set up separately, or several spray bars jointly set up a large insulation cover, which requires a large space and does not meet the design requirements of the increasingly compact afterburner.

[0003] Therefore, it is desirable to have a technical solution to overcome or at least mitigate at least one of the above-mentioned defects of the prior art. Summary of the Invention

[0004] The purpose of this application is to provide an integrated air-cooled direct spray bar to solve at least one problem existing in the prior art.

[0005] The technical solution of this application is as follows:

[0006] An integrated air-cooled direct spray bar, comprising:

[0007] A diffuser casing, a confluence ring is nested inside the diffuser casing, an outer annulus channel is formed between the diffuser casing and the confluence ring, and an inner annulus channel is formed inside the confluence ring;

[0008] A spray bar body, an oil inlet nozzle is arranged at the first end of the spray bar body, the oil inlet nozzle is installed on the diffuser casing, the second end of the spray bar body passes through the outer annulus channel and extends to the inner annulus channel through a through hole opened on the confluence ring, and fuel discharge holes are opened on the part of the spray bar body extending into the inner annulus channel;

[0009] An insulation cover, the insulation cover is sleeved on the spray bar body from the second end of the spray bar body and is fixedly connected to the spray bar body. A cooling cavity is formed between the insulation cover and the spray bar body. The insulation cover has a first part located in the outer annulus channel and a second part located in the inner annulus channel. A cooling air inlet is opened on the first part of the insulation cover, a fuel discharge port and a cooling air outlet are opened on the second part of the insulation cover, and the fuel discharge port corresponds to the fuel discharge holes.

[0010] In at least one embodiment of this application, the oil inlet nozzle has a predetermined angle with the axis of the diffuser casing, and the predetermined angle is 45°.

[0011] In at least one embodiment of the present application, the heat shield is welded to the spray bar body by a circumferential fillet weld.

[0012] In at least one embodiment of the present application, the cooling air inlet is opened in front of the heat shield, and the cooling air outlet is opened behind the heat shield.

[0013] In at least one embodiment of the present application, the cooling air inlet is circular, and the cooling air outlet is strip-shaped.

[0014] In at least one embodiment of the present application, 6 cooling air outlets are evenly opened along the heat shield from top to bottom.

[0015] In at least one embodiment of the present application, it further includes a vibration-proof heat shield nested inside the diffuser casing. The vibration-proof heat shield is fixedly connected to the diffuser casing. The vibration-proof heat shield is axially located behind the confluence ring and radially located between the confluence ring and the diffuser casing, and the vibration-proof heat shield and the confluence ring have an overlapping part with a predetermined length in the radial direction.

[0016] The invention has at least the following beneficial technical effects:

[0017] The integrated air-cooled direct spray bar of the present application occupies a small space, has high temperature resistance, has a simple structure, and can be directly inserted into the wall surface of the afterburner casing for use. Brief Description of the Drawings

[0018] Figure 1 It is a schematic diagram of an integrated air-cooled direct spray bar according to an embodiment of the present application.

[0019] Wherein:

[0020] 1 - spray bar body; 2 - heat shield; 3 - cooling air inlet; 4 - cooling air outlet; 5 - diffuser casing; 6 - confluence ring; 7 - vibration-proof heat shield. Detailed Embodiments

[0021] To make the objectives, technical solutions, and advantages of the present application more clear, the following will describe in more detail the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. In the drawings, the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The described embodiments are some, but not all, of the embodiments of the present application. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present application and should not be construed as limiting the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present application. The following will describe the embodiments of the present application in detail with reference to the accompanying drawings.

[0022] In the description of the present application, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the scope of protection of the present application.

[0023] The following will further describe the present application in detail with reference to the Figure 1 accompanying drawings.

[0024] The present application provides an integrated air-cooled direct injection spray boom, including: a diffuser casing 5, a spray boom body 1, and a heat shield 2.

[0025] Specifically, as Figure 1 shown, a confluence ring 6 is nested inside the diffuser casing 5. An outer duct is formed between the diffuser casing 5 and the confluence ring 6, and an inner duct is formed inside the confluence ring 6. Cooling gas flows through the outer duct, and high-temperature gas flows through the inner duct. An oil inlet nozzle is provided at the first end of the spray boom body 1, and the oil inlet nozzle is installed on the diffuser casing 5 through a fastener. The second end of the spray boom body 1 passes through the outer duct and extends into the inner duct through a through hole opened on the confluence ring 6. Fuel discharge holes are opened on the part of the spray boom body 1 extending into the inner duct. The heat shield 2 is sleeved on the spray boom body 1 from the second end of the spray boom body 1 and is fixedly connected to the spray boom body 1. A cooling cavity is formed between the heat shield 2 and the spray boom body 1. The heat shield 2 has a first part located in the outer duct and a second part located in the inner duct. A cooling gas inlet 3 is opened on the first part of the heat shield 2, and a fuel discharge port and a cooling gas outlet 4 are opened on the second part of the heat shield 2. The fuel discharge port corresponds to the fuel discharge holes.

[0026] In a preferred embodiment of the present application, the fuel inlet nozzle has a predetermined angle with the axis of the diffuser casing 5, and the predetermined angle is 45°.

[0027] In a preferred embodiment of the present application, the heat shield 2 is sleeved on the spray bar body 1 to form a concentric sleeve structure. The heat shield 2 and the spray bar body 1 are welded together by a circumferential fillet weld to form an integrated air-cooled spray bar without redundant connecting components.

[0028] In a preferred embodiment of the present application, the cooling air inlet 3 is opened in front of the heat shield 2, and the cooling air outlet 4 is opened behind the heat shield 2. In this embodiment, the cooling air inlet 3 is a large-sized circular opening, and the cooling air outlet 4 is strip-shaped, with 6 evenly opened along the heat shield 2 from top to bottom.

[0029] In a preferred embodiment of the present application, a vibration-proof heat shield 7 is further nested inside the diffuser casing 5. The vibration-proof heat shield 7 is fixedly connected to the diffuser casing 5. The vibration-proof heat shield 7 is axially located behind the confluence ring 6 and radially located between the confluence ring 6 and the diffuser casing 5, and the vibration-proof heat shield 7 and the confluence ring 6 have an overlapping part with a predetermined length in the radial direction. The vibration-proof heat shield 7 is a large-sized thin-walled part, mainly for cooling and heat insulation of the diffuser casing 5, and at the same time has the function of suppressing oscillatory combustion.

[0030] For the integrated air-cooled direct injection spray bar of the present application, a circular cold air inlet 3 is provided in front of the heat shield 2, and a strip-shaped cooling outlet 4 is provided from top to bottom behind the heat shield 2. The cooling gas in the outer annulus channel enters the cooling cavity between the spray bar body 1 and the heat shield 2 through the cold air inlet 3, isolating the spray bar body 1 from the high-temperature gas in the inner annulus, which can effectively reduce the temperature of the spray bar body 1. At the same time, due to the airflow in the engine inner annulus, a low-pressure area is formed behind the heat shield 2. The strip-shaped cooling outlet 4 can timely discharge the cooling gas inside the cooling cavity, making full use of the low-pressure area to realize the renewal of the internal cooling gas and preventing the internal airflow from stagnating or the high-temperature gas from flowing back.

[0031] The above is only the specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present application should be covered by the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. An integrated air-cooled direct injection spray boom, characterized in that, Comprising: A diffuser casing (5), inside which a confluence ring (6) is nested. An outer duct passage is formed between the diffuser casing (5) and the confluence ring (6), and an inner duct passage is formed inside the confluence ring (6); A spray bar body (1), at the first end of which an oil inlet nozzle is provided. The oil inlet nozzle is installed on the diffuser casing (5). The second end of the spray bar body (1) passes through the outer duct passage and extends into the inner duct passage through a through hole formed in the confluence ring (6). Fuel discharge holes are formed on the part of the spray bar body (1) extending into the inner duct passage; A heat shield (2), which is sleeved on the spray bar body (1) at the second end of the spray bar body (1) and is fixedly connected to the spray bar body (1). A cooling cavity is formed between the heat shield (2) and the spray bar body (1). The heat shield (2) has a first part located in the outer duct passage and a second part located in the inner duct passage. A cooling air inlet (3) is formed in the first part of the heat shield (2), and a fuel discharge outlet and a cooling air outlet (4) are formed in the second part of the heat shield (2). The fuel discharge outlet corresponds to the fuel discharge holes; The cooling air inlet (3) is formed in front of the heat shield (2), and the cooling air outlet (4) is formed behind the heat shield (2).

2. The integrated air-cooled direct injection spray boom according to claim 1, wherein The axis of the oil inlet nozzle and the diffuser casing (5) has a predetermined angle, and the predetermined angle is 45°.

3. The integrated air-cooled direct injection spray boom according to claim 1, characterized in that, The heat shield (2) and the spray bar body (1) are welded together by a circumferential fillet weld.

4. The integrated air-cooled direct injection spray boom according to claim 1, wherein The cooling air inlet (3) is circular, and the cooling air outlet (4) is strip-shaped.

5. The integrated air-cooled direct injection spray boom according to claim 4, wherein, Six cooling air outlets (4) are evenly formed along the heat shield (2) from top to bottom.

6. The integrated air-cooled direct injection spray boom according to claim 1, wherein Further comprising a vibration-proof heat shield (7) nested inside the diffuser casing (5). The vibration-proof heat shield (7) is fixedly connected to the diffuser casing (5). The vibration-proof heat shield (7) is axially located behind the confluence ring (6) and radially located between the confluence ring (6) and the diffuser casing (5), and the vibration-proof heat shield (7) and the confluence ring (6) have an overlapping part with a predetermined length in the radial direction.

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