Fuel nozzle, combustion chamber, and gas turbine engine

Abstract

The present application aims to provide a fuel nozzle, a combustion chamber and a gas turbine engine, the fuel nozzle comprising an outer shell, a first oil path and a second oil path arranged in the outer shell, the first oil path having a first oil path nozzle, along the oil path direction, the first oil path nozzle having a first inner converging section, a first neck portion and a first prefilming section in sequence; the second oil path being formed between the first oil path and the outer shell, having a second oil path nozzle, along the oil path direction, the second oil path nozzle having a second inner converging section, a second neck portion and a second prefilming section in sequence; wherein the first oil path has a first rotational flow groove, the second oil path has a second rotational flow groove, the first rotational flow groove and the second rotational flow groove are arranged in the same rotational direction to make the fuel flowing through the first rotational flow groove and the second rotational flow groove rotate in the same direction, and the present fuel nozzle can improve the rotational flow effect while reducing pollution emissions.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of gas turbine engines, and particularly relates to a fuel nozzle, a combustion chamber and a gas turbine engine. BACKGROUND

[0002] With the rapid development of aero-engine technology and the continuous enhancement of people's environmental protection awareness, low pollution combustion is the main development direction of modern civil aviation engine combustion chambers. Civil aviation engine combustion chambers must meet the increasingly stringent aviation engine pollution emission standards. The current CAEP6 (Committee on Aviation Environmental Protection) standard has very strict regulations on pollution emissions (especially for NOx), and the new CAEP8 standard proposes to reduce NOx emissions by 15% based on CAEP6, and future civil aviation engine combustion chambers will have higher requirements for pollution emissions.

[0003] In an aero-engine, the combustion chamber is the area where combustion is organized. The compressed air from the compressor enters the combustion chamber and mixes with the fuel gas sprayed by the fuel nozzle to produce high-temperature fuel gas, which drives the turbine to do work and generate thrust. The fuel nozzle sprays fuel into the combustion chamber to be atomized, mixed and burned with the compressed air. Fuel nozzle atomization mainly includes pressure atomization and centrifugal atomization. Currently, advanced fuel nozzles generally combine the two atomization technologies to achieve better fuel atomization, which is beneficial to increasing the ignition boundary and reducing pollution emissions.

[0004] Current fuel nozzles are divided into single oil path nozzles, double oil path nozzles and multiple oil path nozzles (such as three oil paths). For double oil path nozzles, parallel double oil path fuel nozzles are widely used in the field of aero-engines. This type of fuel nozzle has double oil paths and double nozzles, has the advantages of wide oil supply range, good fuel atomization quality, wide lean blowout boundary, etc. For existing double oil path nozzles, how to improve the swirling effect and reduce pollution emissions is a problem that needs to be solved at present. SUMMARY

[0005] The purpose of the present application is to provide a fuel nozzle that can improve the swirling effect while reducing pollution emissions.

[0006] To achieve the aforementioned purpose, the fuel nozzle comprises:

[0007] an outer shell;

[0008] a first oil path provided in the outer shell, having a first oil path nozzle, along the oil path direction, the first oil path nozzle has a first inner converging section, a first neck portion and a first pre-film section in sequence, the inner diameter of the first oil path gradually decreases in the first inner converging section, remains constant in the first neck portion, and gradually increases in the first pre-film section; and

[0009] A second oil passage is arranged in the outer housing and formed between the first oil passage and the outer housing, has a second oil passage nozzle, along the oil passage direction, the second oil passage nozzle has a second inner converging section, a second neck section and a second pre-film section in sequence, the inner diameter of the second oil passage gradually decreases in the second inner converging section, is constant in the second neck section, and gradually increases in the second pre-film section;

[0010] Wherein, the first oil passage has a first rotational flow groove, the second oil passage has a second rotational flow groove, the first rotational flow groove and the second rotational flow groove are opened in the same rotational direction, so that the fuel flowing through the first rotational flow groove and the second rotational flow groove produces same direction rotation.

[0011] In one or more embodiments, along the oil passage direction, the first neck section has a first length, and the first pre-film section has a second length;

[0012] The first neck section has a first diameter, and the first pre-film section has a first opening angle;

[0013] Wherein, the ratio of the second length to the first length is 1.5 to 2.5, the ratio of the first length to the first diameter is 1.1 to 1.5, and the first opening angle is 40 degrees to 70 degrees.

[0014] In one or more embodiments, along the oil passage direction, the second neck section has a third length, and the second pre-film section has a fourth length;

[0015] The second neck section has a second diameter, and the second pre-film section has a second opening angle;

[0016] Wherein, the ratio of the fourth length to the third length is 4 to 6, the ratio of the third length to the second diameter is 0.15 to 0.3, and the second opening angle is 70 degrees to 100 degrees.

[0017] In one or more embodiments, the outer housing includes an oil pipe outer housing and a second oil passage nozzle unit arranged in sequence along the oil passage direction, the second oil passage nozzle unit provides the second oil passage nozzle, and the fuel nozzle includes:

[0018] A first oil pipe has a first outlet;

[0019] A second oil pipe is sleeved outside the first oil pipe and has a second outlet;

[0020] The oil circuit connector has a swirling core, a swirling core through-slot extending axially through the oil circuit connector, and a plurality of connecting holes circumferentially arranged around the outer periphery of the swirling core through-slot. It connects to the first outlet and the second outlet respectively inside the second oil circuit nozzle unit. The first swirling core slot is formed in the oil circuit connector, communicating with the outer side of the oil circuit connector.

[0021] The first oil passage nozzle unit is sleeved on the outer periphery of the oil passage connector inside the second oil passage nozzle unit, and has the first oil passage nozzle inside and a second swirl groove on the outer periphery.

[0022] The swirl core channel connects the first outlet to the first oil circuit nozzle, so that after fuel flows into the first oil pipe in the first oil circuit, it flows through the swirl core channel and the first swirl channel, and is then sprayed out from the first oil circuit nozzle.

[0023] The connecting hole connects the second outlet to the second oil circuit nozzle, so that the fuel in the second oil circuit flows in from the second oil pipe, flows through the connecting hole and the second swirl groove, and is then sprayed out from the second oil circuit nozzle.

[0024] In one or more embodiments, an anti-wear bushing is provided on the outside of the second oil passage nozzle unit, and the anti-wear bushing is disposed on the side of the second oil passage nozzle unit near the second oil passage nozzle.

[0025] In one or more embodiments, the second oil passage nozzle unit and the oil pipe housing and / or the oil passage connector and the second oil pipe and / or the oil passage connector and the first oil pipe and / or the second oil passage nozzle unit and the anti-wear bushing and / or the oil passage connector and the first oil passage nozzle unit are connected by welding.

[0026] In one or more embodiments, the swirl core through-slots are 3 to 5 slots formed around the swirl core.

[0027] In one or more embodiments, the swirl core through-slot is a straight slot that runs through the entire core.

[0028] On the other hand, according to some embodiments of this application, a combustion chamber is provided, which includes the fuel injector as described above.

[0029] In another aspect, according to some embodiments of this application, a gas turbine engine is provided, which includes a combustion chamber as described above.

[0030] The beneficial effects of this aspect are:

[0031] When fuel is injected through a fuel nozzle with this configuration, the fuel in the first fuel path is injected from the first neck of the first fuel path nozzle, atomized in the first pre-film section and subsequent space, and then mixed with compressed air. The fuel in the second fuel path is injected from the second neck of the second fuel path nozzle, atomized in the second pre-film section and subsequent space, and then mixed with compressed air. This results in both fuel paths within the fuel nozzle having a pre-film structure, which can effectively improve the fuel atomization effect.

[0032] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0033] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0034] Figure 1 A schematic diagram of the configuration of a combustion chamber according to some embodiments of this application is shown;

[0035] Figure 2 A half-sectional schematic diagram of a fuel nozzle according to some embodiments of this application is shown;

[0036] Figure 3 A half-sectional schematic diagram of a second oil passage nozzle unit according to some embodiments of this application is shown;

[0037] Figure 4 A half-sectional schematic diagram of an oil passage connector according to some embodiments of this application is shown;

[0038] Figure 5 A side view schematic diagram of an oil passage connector according to some embodiments of this application is shown;

[0039] Figure 6 A half-sectional schematic diagram of a first oil passage nozzle unit according to some embodiments of this application is shown;

[0040] Figure 7 A side view schematic diagram of a first oil passage nozzle unit according to some embodiments of this application is shown. Detailed Implementation

[0041] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0043] The inventors noted that current dual-oil-path dual-nozzle fuel nozzles are subject to significant structural limitations due to the main and auxiliary nozzles and swirl channels. This results in poor swirl effect in the two oil paths and, under specified fuel supply pressure conditions, often poor fuel atomization, leading to poor diffusion combustion performance.

[0044] To address the aforementioned problems, on the one hand, according to some embodiments of this application, a combustion chamber is provided, such as... Figure 1 A schematic diagram of the configuration of a combustion chamber according to some embodiments of this application is shown, which includes an outer casing 91 of the combustion chamber, a diffuser 92, a flame tube wall assembly 93, a head adapter structure 94, a vortex generator 95, and a fuel nozzle 100.

[0045] On the other hand, in order to improve the swirl effect of the combustion chamber while reducing pollution emissions, according to some embodiments of this application, a fuel injector applicable to, for example, a front combustion chamber is also provided. Figure 2 A half-sectional schematic diagram of a fuel nozzle according to some embodiments of this application is shown.

[0046] The fuel injector 100 includes a housing 1 and a first oil passage a and a second oil passage b disposed within the housing 1. The first oil passage a and the second oil passage b are independent of each other within the housing 1. The first oil passage a within the housing 1 is shown by solid arrow a, and the second oil passage b within the housing 1 is shown by dashed arrow b.

[0047] The first oil passage a has a first oil passage nozzle 11, from which fuel flowing in from the first oil passage a is sprayed out. Along the oil passage direction, the first oil passage nozzle 11 sequentially has a first converging section 110, a first neck 111, and a first pre-filming section 112. It can be understood that the oil passage direction is the flow direction of fuel within the fuel nozzle 100. In the structure shown in the figure, with the oil passage direction as a reference, the inner diameter of the first oil passage a gradually decreases from the first converging section 110 to the inner diameter of the first neck 111. The inner diameter of the first oil passage a remains constant at the first neck 111, while at the first pre-filming section 112, the inner diameter gradually increases from the first neck 111.

[0048] The second oil passage b is located between the first oil passage a and the outer casing 1, and is independent of the first oil passage a. The second oil passage b has a second oil passage nozzle 12, and the fuel flowing into the second oil passage b is sprayed out from the second oil passage nozzle 12. Along the oil passage direction, the second oil passage nozzle 12 has a second converging section 120, a second neck 121, and a second pre-filming section 122 in sequence. In the structure shown in the figure, with the oil passage direction as a reference, the inner diameter of the second oil passage b gradually decreases from the second converging section 120 to the inner diameter of the second neck 121. The inner diameter of the second oil passage b remains constant at the second neck 121, while the inner diameter gradually increases from the second neck 121 at the second pre-filming section 122.

[0049] The first oil passage a has a first swirl groove 43, and the second oil passage b has a second swirl groove 51. The first swirl groove 43 and the second swirl groove 51 are opened in the same direction of rotation, so that the oil flowing through the first swirl groove 43 and the second swirl groove 51 rotates in the same direction. It can be understood that the first swirl groove 43 and the second swirl groove 51 being opened in the same direction of rotation means that the opening direction of multiple first swirl grooves 43 and the opening direction of multiple second swirl grooves 51 are simultaneously in a clockwise or counterclockwise direction. This arrangement allows the first oil passage a and the second oil passage b to mix and influence each other, thereby enhancing the aerodynamic atomization and diffusion of the fuel.

[0050] When fuel is injected through a fuel nozzle with the aforementioned configuration, the fuel in the first fuel path a is injected from the first neck 111 of the first fuel path nozzle 11, atomized in the space at and after the first pre-filming section 112, and then mixed with compressed air. The fuel in the second fuel path b is injected from the second neck 121 of the second fuel path nozzle 12, atomized in the space at and after the second pre-filming section 122, and then mixed with compressed air. This results in both fuel paths within the fuel nozzle having a pre-filming structure, which effectively improves the fuel atomization effect.

[0051] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0052] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0053] According to some embodiments of this application, the fuel nozzle 100 further has the following specific configuration. Please refer to... Figure 2 The outer casing 1 includes an oil pipe outer casing 101 and a second oil passage nozzle unit 102 arranged sequentially along the oil passage direction, such as... Figure 3 A half-sectional schematic diagram of a second oil passage nozzle unit 102 according to some embodiments of the present application is shown. The second oil passage nozzle unit 102 is provided with a second oil passage nozzle 12 in the aforementioned second oil passage b, that is, the second oil passage nozzle 12 is formed on the inner peripheral side of the second oil passage nozzle unit 102.

[0054] The fuel nozzle 100 also includes a first fuel pipe 2, a second fuel pipe 3, a fuel line connector 4, and a first fuel line nozzle unit 5 disposed within the housing 1. The first fuel pipe 2 has a first outlet 20, and the second fuel pipe 3 is sleeved on the outer periphery of the first fuel pipe 2 and has a second outlet 30.

[0055] Figure 4 A partial cross-sectional schematic diagram of an oil passage connector according to some embodiments of this application is shown. Figure 5 A side view of an oil circuit connector according to some embodiments of this application is shown. The oil circuit connector 4 has a swirling core at its center. A swirling core through-slot 41, extending axially through the oil circuit connector 4 outside the swirling core, is also present. A plurality of connecting holes 42 are circumferentially arranged in the oil circuit connector 4 surrounding the swirling core through-slot 41. The oil circuit connector 4 is disposed inside the second oil circuit nozzle unit 102 and is connected to the first outlet 20 and second outlet 30 of the first oil pipe 2 and the second oil pipe 3, respectively, inside the second oil circuit nozzle unit 102. A first swirling groove 43 is formed in the oil circuit connector 4, communicating with the swirling core through-slot 41 and the outside of the oil circuit connector 4.

[0056] Figure 6 A half-sectional schematic diagram of a first oil passage nozzle unit according to some embodiments of this application is shown.Figure 7 A side view of a first oil passage nozzle unit according to some embodiments of this application is shown. The first oil passage nozzle unit 5 is disposed inside the second oil passage nozzle unit 102, and is sleeved on the outer periphery of the oil passage connector 4 inside the second oil passage nozzle unit 102, thereby connecting the area between the swirling core through groove 41 and the oil passage connector 4 and the first oil passage nozzle unit 5 via the first swirling groove 43. The first oil passage nozzle unit 5 has a first oil passage nozzle 11 inside and a second swirling groove 51 on its outer periphery.

[0057] The swirl core channel 41 connects the first outlet 20 with the first oil passage nozzle 11, so that the flow path of fuel in the first oil passage a is as follows: In the first oil passage a, after the fuel flows in from the first oil pipe 2, it flows through the swirl core channel 41 and the first swirl channel 43, and is sprayed out from the first oil passage nozzle 11. It is atomized in the space of the first pre-film section 112 and thereafter, and then mixed with compressed air.

[0058] The connecting hole 42 connects the second outlet 30 to the second oil passage nozzle 12 so that the flow path of fuel in the second oil passage b is as follows: after the fuel in the second oil passage b flows in from the second oil pipe 3, it flows through the connecting hole 42 and the second swirl groove 51, and is sprayed out from the second oil passage nozzle 12. It is atomized in the space of the second pre-film section 122 and thereafter, and then mixed with compressed air.

[0059] It is understood that in some other suitable embodiments, the dual-fuel-path fuel injector may have other suitable configurations, but it needs to have a first pre-film section 112 and a second pre-film section 122 to effectively improve fuel atomization.

[0060] Please see Figure 6 According to some embodiments of this application, the first fuel line nozzle 11 has the following structure: along the fuel line direction, the first neck 111 has a first length L1, and the first pre-filming section 112 has a second length. The first neck 111 also has a first diameter D1, and the first pre-filming section 112 is a gradually expanding cone shape with a first angle x1. Wherein, L2 / L1 = 1.5 to 2.5, L1 / D1 = 1.1 to 1.5, and x1 is between 40° and 70°. By configuring the first fuel line nozzle 11 with the above configuration, it has a longer pre-filming structure, thereby preventing backfire, improving the coking problem of the fuel nozzle orifice, reducing NOx emissions, and improving the uniformity of the combustion chamber outlet temperature field.

[0061] Please see Figure 3According to some embodiments of this application, the second fuel line nozzle 12 has the following structure: along the fuel line direction, the second neck 121 has a third length L3, and the second pre-filming section 122 has a fourth length L4. Simultaneously, the second neck 121 also has a second diameter D2, and the second pre-filming section 122 is a gradually expanding cone shape with a second angle x2. Wherein, L4 / L3 = 4 to 6, L3 / D2 = 0.15 to 0.3, and x2 is between 70° and 100°. By configuring the second fuel line nozzle 12 with the above configuration, it has a longer pre-filming structure, thereby preventing backfire, improving the coking problem of the fuel nozzle orifice, reducing NOx emissions, and improving the uniformity of the combustion chamber outlet temperature field.

[0062] Furthermore, according to some embodiments of this application, an anti-wear bushing 7 is also provided on the outside of the second oil circuit nozzle unit 102. The anti-wear bushing 7 is provided on the side of the second oil circuit nozzle unit 102 near the second oil circuit nozzle 12, as shown in the figure. By providing the anti-wear bushing 7, the wear resistance of the fuel nozzle 100 can be improved and its service life can be extended.

[0063] Furthermore, according to some embodiments of this application, the second oil nozzle unit 102 and the oil pipe housing 101 and / or the oil connector 4 and the second oil pipe 3 and / or the oil connector 4 and the first oil pipe 2 and / or the second oil nozzle unit 102 and the anti-wear bushing 7 and / or the oil connector 4 and the first oil nozzle unit 5 are connected by welding.

[0064] In some specific embodiments, the second oil passage nozzle unit 102 is welded to the oil pipe housing 101 using argon arc welding. The oil passage connector 4 is welded to the second oil pipe 3 using brazing. The oil passage connector 4 is welded to the first oil pipe 2 using brazing. The second oil passage nozzle unit 102 is welded to the anti-wear bushing 7 using argon arc welding. The oil passage connector 4 is welded to the first oil passage nozzle unit 5 using argon arc welding.

[0065] The oil circuit connector 4 and the first oil pipe 2 are connected by brazing. The welding connection causes welding shrinkage, which makes the oil circuit connector 4 and the first oil pipe 2 fit tightly together, eliminating the gap between the two. This is beneficial for precise control of the effective flow area of ​​fuel and has a better swirling effect.

[0066] In some specific embodiments, the swirl core through grooves 41 are 3 to 5 openings around the swirl core. It has been verified that by setting 3 to 5 swirl core through grooves 41, a better swirl effect can be obtained without reducing the firmness of the fuel nozzle itself.

[0067] In some specific embodiments, the swirl core through groove 41 is a straight groove that runs through the entire nozzle. The swirl core through groove 41 with a straight groove configuration is easy to process and effectively improves the manufacturing efficiency of this fuel nozzle.

[0068] On the other hand, according to some embodiments of this application, a gas turbine engine is also provided, which includes a combustion chamber as described above.

[0069] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0070] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A fuel nozzle, characterized in that, include: outer shell; A first oil passage disposed within the outer casing has a first oil passage nozzle. Along the oil passage direction, the first oil passage nozzle sequentially comprises a first converging section, a first neck, and a first pre-filming section. The inner diameter of the first oil passage gradually decreases in the first converging section, remains constant in the first neck, and gradually increases in the first pre-filming section. The second oil passage is disposed in the outer casing and is formed between the first oil passage and the outer casing. It has a second oil passage nozzle. Along the direction of the oil passage, the second oil passage nozzle has a second converging section, a second neck and a second pre-filming section in sequence. The inner diameter of the second oil passage gradually decreases in the second converging section, remains constant in the second neck, and gradually increases in the second pre-filming section. The first oil passage has a first swirl channel, and the second oil passage has a second swirl channel. The first swirl channel and the second swirl channel are opened in the same direction of rotation so that the fuel flowing through the first swirl channel and the second swirl channel rotates in the same direction. The outer casing includes an oil pipe outer casing and a second oil passage nozzle unit arranged sequentially along the oil passage direction. The second oil passage nozzle unit provides a second oil passage nozzle. The fuel nozzle includes components disposed within the outer casing. The first oil pipeline has the first outlet; The second oil pipe is sleeved outside the first oil pipe and has a second outlet; The oil circuit connector has a swirling core, a swirling core through-slot extending axially through the oil circuit connector, and a plurality of connecting holes circumferentially arranged around the outer periphery of the swirling core through-slot. It connects to the first outlet and the second outlet respectively inside the second oil circuit nozzle unit. The first swirling core slot is formed in the oil circuit connector, communicating with the outer side of the oil circuit connector. The first oil passage nozzle unit is sleeved on the outer periphery of the oil passage connector inside the second oil passage nozzle unit, and has the first oil passage nozzle inside and a second swirl groove on the outer periphery. The swirl core channel connects the first outlet to the first oil circuit nozzle, so that after fuel flows into the first oil pipe in the first oil circuit, it flows through the swirl core channel and the first swirl channel, and is then sprayed out from the first oil circuit nozzle. The connecting hole connects the second outlet to the second oil circuit nozzle, so that after the fuel in the second oil circuit flows in from the second oil pipe, it flows through the connecting hole and the second swirl groove, and then is sprayed out from the second oil circuit nozzle. The second oil circuit nozzle unit is fitted with an anti-wear bushing on its outer side, and the anti-wear bushing is located on the side of the second oil circuit nozzle unit near the second oil circuit nozzle. The second oil passage nozzle unit is connected to the oil pipe housing and / or the oil passage connector is connected to the second oil pipe and / or the oil passage connector is connected to the first oil pipe and / or the second oil passage nozzle unit is connected to the anti-wear bushing and / or the oil passage connector is connected to the first oil passage nozzle unit by welding.

2. The fuel nozzle as claimed in claim 1, characterized in that, Along the oil passage direction, the first neck has a first length, and the first pre-filming section has a second length; The first neck has a first diameter, and the first pre-filming segment is in the shape of a gradually expanding cone with a first opening angle; The ratio of the second length to the first length is 1.5 to 2.5, the ratio of the first length to the first diameter is 1.1 to 1.5, and the first angle is 40 degrees to 70 degrees.

3. The fuel nozzle as claimed in claim 1, characterized in that, Along the oil passage direction, the second neck has a third length, and the second pre-filming section has a fourth length; The second neck has a second diameter, and the second pre-filming segment is in the shape of a gradually expanding cone with a second opening angle; The ratio of the fourth length to the third length is 4 to 6, the ratio of the third length to the second diameter is 0.15 to 0.3, and the second angle is 70 to 100 degrees.

4. The fuel nozzle as claimed in claim 1, characterized in that, The swirl core through-slots are 3 to 5 slots opened around the swirl core.

5. The fuel nozzle as claimed in claim 1, characterized in that, The vortex core through groove is a straight groove that runs through the entire core.

6. A combustion chamber, characterized in that, Includes the fuel nozzle as described in any one of claims 1 to 5.

7. A gas turbine engine, characterized in that, Includes the combustion chamber as described in claim 6.

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