A swirl jet relay nozzle with air cooling

Abstract

This application belongs to the field of afterburner diffuser nozzles, and particularly relates to a swirl jet relay nozzle with air cooling. It includes: an afterburner diffuser casing 7, a nozzle body, a swirler 4, and a heat shield 6. In the swirl jet relay nozzle with air cooling of this application, by adding a swirler 4 in the relay nozzle, the fuel ejection mode is changed from direct injection to swirl injection, which can effectively improve the fuel atomization effect; by reasonably designing the structural form and installation method of the heat shield 6, on the premise of minimizing the blocking area to the greatest extent, the nozzle body and the swirler 4 are effectively cooled by the bypass cold air, reducing the risk of ablation and coking; by blowing out the remaining oil, the problem of coking and blockage inside the jet relay is solved, and the service life of the relay nozzle is greatly improved.

Description

Technical Field

[0001] This application belongs to the field of afterburner relay nozzles of aero-engines, and particularly relates to a swirl jet relay nozzle with air cooling. Background Art

[0002] Currently, the ignition methods of the afterburner of aero-engines mainly include indirect ignition, direct ignition, hot jet ignition, and plasma ignition. Among them, the hot jet ignition method has been successfully applied to aero-engines abroad for a long time due to its stable ignition and high success rate. The traditional jet relay nozzle mainly adopts a direct injection form, with poor atomization effect. At the same time, after the jet relay nozzle sprays fuel, residual fuel is likely to accumulate. As the temperature after the turbine continues to increase, the jet relay nozzle is prone to ablation, and the residual fuel inside the nozzle is extremely likely to coke under high-temperature conditions for a long time, causing nozzle blockage and affecting the normal ignition of the afterburner.

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

[0004] The purpose of this application is to provide a swirl jet relay nozzle with air cooling to solve at least one problem existing in the prior art.

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

[0006] A swirl jet relay nozzle with air cooling, comprising:

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

[0008] A nozzle body, which includes an oil inlet nozzle, a conduit, and a sprayer housing. The oil inlet nozzle is installed on the outer wall surface of the afterburner diffuser casing. The first end of the conduit is connected to the oil inlet nozzle, the second end passes through the outer annulus channel and extends to the inner annulus channel through a through hole opened on the confluence ring. The sprayer housing is installed at the second end of the conduit, and fuel discharge holes are opened on the sprayer housing;

[0009] A swirler, which is installed inside the sprayer housing. The swirler is provided with a swirl chamber, the swirl chamber is communicated with the conduit through a swirl oil inlet hole, and the swirl chamber is also communicated with the fuel discharge holes;

[0010] The heat shield is sleeved on the second end of the conduit and connected to the conduit through a bushing. A cooling cavity is formed between the heat shield and the nozzle body. The heat shield has a first part located in the outer bypass passage and a second part located in the inner bypass passage. A first opening is provided in front of the first part of the heat shield, and a second opening is provided behind the second part of the heat shield. The second opening corresponds to the fuel discharge hole. The cooling gas in the outer bypass passage flows into the cooling cavity through the first opening and into the inner bypass passage through the second opening.

[0011] In at least one embodiment of the present application, the swirler and the sprayer housing are fixed in a welded form.

[0012] In at least one embodiment of the present application, the swirler is circumferentially and uniformly provided with 4 swirl inlet holes.

[0013] In at least one embodiment of the present application, the axis of the swirl inlet hole is tangent to the inner wall surface of the swirler.

[0014] In at least one embodiment of the present application, the bushing is fixed to the conduit and the heat shield in a welded form.

[0015] In at least one embodiment of the present application, a third opening is further provided in front of the second part of the heat shield. The third opening communicates with the swirl chamber of the swirler, and the third opening is coaxially arranged with the fuel discharge hole.

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

[0017] The gas-cooled swirl jet relay nozzle of the present application realizes the cooling of the conduit, the sprayer housing and the swirler by forming a cooling cavity between the heat shield and the nozzle body, effectively reducing the risk of component ablation and fuel coking; the fuel is changed from a direct injection form to a swirl form by the swirler, and the fuel can be fully dispersed and atomized after being ejected through the centrifugal force generated by high-speed rotation, and the atomization effect is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is an assembly schematic diagram of a gas-cooled swirl jet relay nozzle according to an embodiment of the present application;

[0019] Figure 2 is a schematic diagram of a nozzle body according to an embodiment of the present application;

[0020] Figure 3 is Figure 2 an enlarged view of part A of

[0021] Figure 4Schematic diagram of the residual oil blowing method according to an embodiment of the present application.

[0022] Wherein:

[0023] 1 - oil inlet nozzle; 2 - conduit; 3 - sprayer housing; 4 - swirler; 5 - bushing; 6 - heat shield; 7 - afterburner diffuser casing; 8 - confluence ring. Specific embodiments

[0024] To make the purpose, technical solutions and advantages of the implementation of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the accompanying drawings in the embodiments of the present application. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having 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 by referring to the drawings are exemplary and are intended to explain the present application and should not be construed as limiting the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the scope of protection of the present application. The embodiments of the present application will be described in detail below with reference to the drawings.

[0025] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is 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 thus should not be construed as limiting the scope of protection of the present application.

[0026] The following is further described in detail with reference to the attached Figures 1 to 4 The present application will be further described in detail.

[0027] The present application provides a swirl jet relay nozzle with air cooling, including: an afterburner diffuser casing 7, a nozzle body, a swirler 4, and a heat shield 6.

[0028] Specifically, as Figure 1As shown, a confluence ring 8 is nested inside the afterburner diffuser casing 7. An outer duct passage is formed between the afterburner diffuser casing 7 and the confluence ring 8, and an inner duct passage is formed inside the confluence ring 8. Cooling gas flows through the outer duct passage, and high-temperature gas flows through the inner duct passage. The nozzle body includes an oil inlet nozzle 1, a conduit 2, and a sprayer housing 3. Among them, the oil inlet nozzle 1 is installed on the outer wall surface of the afterburner diffuser casing 7 through fasteners. The first end of the conduit 2 is connected to the oil inlet nozzle 1, the second end passes through the outer duct passage, and extends into the inner duct passage through a through hole opened on the confluence ring 8. The sprayer housing 3 is installed at the second end of the conduit 2, and a fuel discharge hole is opened on the sprayer housing 3.

[0029] A swirler 4 is installed inside the sprayer housing 3. The swirler 4 is provided with a swirl chamber, and the swirl chamber is communicated with the conduit 2 through a swirl oil inlet hole. The swirl chamber is also communicated with the fuel discharge hole on the sprayer housing 3. The relay nozzle mainly realizes swirl atomization through the swirler 4. High-pressure fuel enters the swirler 4 through the oil inlet nozzle 1 and the conduit 2 of the relay nozzle. After passing through the swirl oil inlet hole of the swirler 4, the fuel changes from a direct injection form to a swirl form. Through the centrifugal force after high-speed rotation, the fuel can be fully dispersed and atomized after being ejected from the fuel discharge hole of the sprayer housing 3.

[0030] The relay nozzle adopts a concentric sleeve-type heat shield 6. The heat shield 6 is sleeved on the conduit 2 from the second end of the conduit 2 and is connected to the conduit 2 through a bushing 5. A cooling chamber is formed between the heat shield 6 and the nozzle body. The heat shield 6 has a first part located in the outer duct passage and a second part located in the inner duct passage. A first opening is opened on the first part of the heat shield 6, and the cooling chamber is communicated with the outer duct passage through the first opening opened on the heat shield 6. A second opening is opened on the second part of the heat shield 6. The second opening corresponds to the fuel discharge hole, and the size of the second opening is larger than that of the fuel discharge hole, so that the cooling gas in the outer duct passage flows into the cooling chamber from the first opening and flows into the inner duct passage from the second opening, thereby realizing the discharge of fuel and cooling gas at the same time. As shown in the figure, the first opening is opened in front of the heat shield 6, that is, in the oncoming flow direction of the air flow in the outer duct passage, and the second opening is opened behind the heat shield 6.

[0031] Furthermore, the heat shield 6 can minimize the blockage area of the jet spray rod to the greatest extent while ensuring that the nozzle body in the inner duct passage is not ablated. A cooling chamber is formed between the heat shield 6 and the nozzle body. The cold air in the outer duct passage can enter the cooling chamber through the first opening on the heat shield 6 to cool the conduit 2, the sprayer housing 3, and the swirler 4, effectively reducing the risk of component ablation and fuel coking.

[0032] In the preferred embodiment of the present application, as Figures 2 - 4As shown, the sprayer housing 3 is installed at the end of the conduit 2. The interior of the sprayer housing 3 has a receiving cavity. The swirler 4 is installed in the receiving cavity of the sprayer housing 3 and is fixed to the sprayer housing 3 by welding. Four swirling fuel inlet holes are evenly arranged circumferentially on the wall surface of the swirler 4, and preferably, the axes of the swirling fuel inlet holes are tangent to the inner wall surface of the swirler 4. The swirling cavity of the swirler 4 communicates with the conduit 2 through the swirling fuel inlet holes, and the fuel entering the swirling cavity of the swirler 4 is ejected through the fuel discharge holes on the sprayer housing 3.

[0033] In a preferred embodiment of the present application, the bushing 5 is fixed to the conduit 2 and the heat shield 6 by welding.

[0034] In a preferred embodiment of the present application, the second part of the heat shield 6 is also provided with a third opening, which communicates with the swirling cavity of the swirler 4 and is coaxially arranged with the fuel discharge holes. The third opening is arranged in front of the heat shield 6, that is, in the oncoming flow direction of the air flow in the inner annulus passage. This third opening is used to achieve residual oil blowing. After the relay nozzle stops injecting fuel, the high-speed oncoming flow in front passes through the swirler 4, and the residual oil inside is blown out from the fuel discharge holes of the rear sprayer housing 3, effectively solving the problem of fuel coking and blocking the nozzle inside the nozzle.

[0035] The gas-cooled swirling jet relay nozzle of the present application, by adding a swirler 4 in the relay nozzle, changes the fuel ejection mode from direct injection to swirling injection, which can effectively improve the fuel atomization effect; by reasonably designing the structural form and installation method of the heat shield 6, on the premise of minimizing the blocking area to the greatest extent, the nozzle body and the swirler 4 are effectively cooled by the cold air in the outer annulus, reducing the risk of ablation and coking; by residual oil blowing, the problem of coking and blocking inside the jet relay is solved, and the service life of the relay nozzle is greatly improved.

[0036] 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 in the present application should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claimed rights.

Claims

1. A swirl jet relay nozzle with air cooling, characterized in that Comprising: An afterburner diffuser casing (7), within which a confluence ring (8) is nested. An outer annulus passage is formed between the afterburner diffuser casing (7) and the confluence ring (8), and an inner annulus passage is formed within the confluence ring (8); A nozzle body, which includes an oil inlet nozzle (1), a conduit (2), and a sprayer housing (3). The oil inlet nozzle (1) is installed on the outer wall surface of the afterburner diffuser casing (7). The first end of the conduit (2) is connected to the oil inlet nozzle (1), the second end passes through the outer annulus passage and extends into the inner annulus passage through a through hole formed in the confluence ring (8). The sprayer housing (3) is installed at the second end of the conduit (2), and fuel discharge holes are formed in the sprayer housing (3); A swirler (4), which is installed inside the sprayer housing (3). The swirler (4) is provided with a swirl chamber, the swirl chamber is communicated with the conduit (2) through a swirl oil inlet hole, and the swirl chamber is also communicated with the fuel discharge holes; A heat shield (6), which is sleeved on the conduit (2) from the second end of the conduit (2) and is connected to the conduit (2) through a bushing (5). A cooling chamber is formed between the heat shield (6) and the nozzle body. The heat shield (6) has a first part located in the outer annulus passage and a second part located in the inner annulus passage. A first opening is formed in front of the first part of the heat shield (6), and a second opening is formed behind the second part of the heat shield (6). The second opening corresponds to the fuel discharge holes. The cooling gas in the outer annulus passage flows into the cooling chamber through the first opening and into the inner annulus passage through the second opening; A third opening is further formed in front of the second part of the heat shield (6), the third opening is communicated with the swirl chamber of the swirler (4), and the third opening is coaxially arranged with the fuel discharge holes.

2. The swirl jet relay nozzle with air cooling according to claim 1, characterized in that, The swirler (4) and the sprayer housing (3) are fixed in a welded form.

3. The swirl jet relay nozzle with air cooling according to claim 1, characterized in that, The swirler (4) is evenly provided with 4 swirl oil inlet holes in the circumferential direction.

4. The swirl jet relay nozzle with air cooling according to claim 3, characterized in that, The axis of the swirl oil inlet hole is tangent to the inner wall surface of the swirler (4).

5. The swirl jet relay nozzle with air cooling according to claim 1, characterized in that, The bushing (5) is fixed to the conduit (2) and the heat shield (6) in a welded form.

Images