Gas turbine and its combustion chamber

Abstract

The present application aims to provide a kind of gas turbine and its combustion chamber, combustion chamber includes casing, be set in the flame tube of casing, first connecting piece and second connecting piece.First connecting piece is fixedly connected with the end of flame tube close to the head of combustion chamber with casing, second connecting piece, fixedly connected with the other side of casing, wherein, first cooling hole is opened in second connecting piece, one of flame tube and second connecting piece has connecting ring, the other has connecting ring slot, connecting ring and connecting ring slot can be inserted and connected, so that flame tube is supported in casing by first connecting piece and second connecting piece, in the assembled state, connecting ring and the distance between the groove bottom wall of connecting ring slot are separated, by this combustion chamber, the problem that flame tube connecting structure is easily failed after heat deformation can be solved.

Description

Technical Field

[0001] This invention relates to the field of gas turbine engine technology, and more particularly to a gas turbine and its combustion chamber. Background Technology

[0002] Gas turbine combustors typically require extensive component testing to verify their performance, including outlet temperature distribution tests, emissions tests, combustion efficiency tests, oscillation characteristic tests, and thermal protection tests. As engine cycle parameters increase, combustor outlet temperatures rise, subjecting the outlet to the scouring of high-temperature combustion gases. The connection structure at the combustor outlet must fully consider the deformation caused by the combustor's thermal load to prevent failure due to relative deformation caused by heat. Furthermore, the cooling design near the connection structure presents significant challenges. All of these factors pose substantial challenges to the design and cooling of the connection structure at the combustor outlet.

[0003] How to solve the problem of easy failure of the flame tube connection structure after thermal deformation is a challenge in the existing technology. Summary of the Invention

[0004] The purpose of this invention is to provide a combustion chamber that can solve the problem of easy failure after the flame tube connection structure is deformed by heat.

[0005] A combustion chamber for achieving the aforementioned objective includes:

[0006] Casing;

[0007] The flame tube is disposed inside the casing;

[0008] A first connector, on one side of the casing, securely connects one end of the flame tube near the head of the combustion chamber to the casing; and

[0009] The second connector is fixedly connected to the other side of the casing;

[0010] The second connector has a first cooling hole. One of the flame tube and the second connector has a connecting ring, and the other has a connecting ring groove. The connecting ring and the connecting ring groove can be inserted into each other so that the flame tube is supported in the casing by the first connector and the second connector. In the assembled state, the connecting ring and the bottom wall of the connecting ring groove are separated by a distance.

[0011] In one or more embodiments, the flame tube has the connecting ring, and a connecting ring groove is formed on the end face of the second connector.

[0012] In one or more embodiments, the flame tube is provided with a plurality of second cooling holes, which are arranged at intervals along the axial direction of the flame tube in the tube wall near the connecting ring and / or in the connecting ring.

[0013] In one or more embodiments, each of the second cooling holes is inclined toward the second connector from the outside of the flame tube to the inside of the flame tube.

[0014] In one or more embodiments, the first cooling hole is arranged at an angle relative to the central axis of the flame tube.

[0015] In one or more embodiments, each of the first cooling holes has an included angle with the central axis of the flame tube, and the included angle gradually increases from an acute angle to an obtuse angle from the first connector to the second connector.

[0016] In one or more embodiments, the second connector further includes a connecting section and a fixing part, the fixing part being fixedly connected to the other side of the housing, and the connecting section connecting the fixing part and the connecting ring groove;

[0017] The first cooling hole is located in the connecting section.

[0018] In one or more embodiments, a heat insulation plate is provided on the fixing part, and the heat insulation plate is arranged in an outwardly flared shape toward the outside of the fixing part.

[0019] In one or more embodiments, the fixing part is provided with an air vent.

[0020] On the other hand, according to some embodiments of this application, a gas turbine is also provided, which includes the combustion chamber as described above.

[0021] The beneficial effects of this invention are as follows:

[0022] By inserting the connecting ring at the end of the flame tube into the connecting ring groove on the end face of the second connector, with a certain axial clearance reserved, the flame tube can float freely along the axial direction, reducing the stress at the flame tube outlet connection position, improving the service life of the flame tube, and enhancing the reliability of the connection structure. Simultaneously, a first cooling hole is provided in the second connector, allowing heat exchange between the overall wall temperature of the second connector and the cooling airflow passing through the first cooling hole, thereby reducing the thermal stress of the connection section. Through the synergistic effect of these two methods, considering the deformation caused by the heat load of the flame tube, the failure of the second connector due to thermal deformation is avoided. At the same time, effective cooling of the vicinity of the second connector is achieved, solving the problem of easy failure of the flame tube connection structure due to thermal deformation.

[0023] 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, specific embodiments of this application are given below. Attached Figure Description

[0024] 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:

[0025] Figure 1 A half-sectional schematic diagram according to some embodiments of this combustion chamber is shown;

[0026] Figure 2 Partial schematic diagrams according to some embodiments of this combustion chamber are shown;

[0027] Figure 3 for Figure 2 A magnified view of part A;

[0028] Figure 4 for Figure 2 A magnified view of part B. Detailed Implementation

[0029] 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.

[0030] 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.

[0031] To address the problem of easy failure of the flame tube connection structure after thermal deformation, on the one hand, according to some embodiments of this application, a combustion chamber is provided. Figure 1 A half-sectional schematic diagram according to some embodiments of this combustion chamber is shown. Figure 2 Partial schematic diagrams according to some embodiments of this combustion chamber are shown. Figure 3 for Figure 2 A magnified view of part A. Figure 4 for Figure 2 A magnified view of part B.

[0032] like Figure 1 As shown, the combustion chamber includes a casing 1, a flame tube 2, a first connector 3, and a second connector 4. The flame tube 2 is disposed inside the casing 1, the first connector 3 is disposed on one side of the casing 1, and the end of the flame tube 2 near the head 20 of the combustion chamber is fixedly connected to the casing 1, and the second connector 4 is fixedly connected to the other side of the casing 1.

[0033] The second connecting member 4 has a first cooling hole 40. One of the flame tube 2 and the second connecting member 4 has a connecting ring 21, and the other has a connecting ring groove 41. The connecting ring 21 and the connecting ring groove 41 can be inserted into each other, so that the flame tube 2 is supported within the casing 1 by both the first connecting member 3 and the second connecting member 4. Meanwhile, in the assembled state, the connecting ring 21 and the bottom wall of the connecting ring groove 41 are separated by a distance x.

[0034] In the embodiment shown in the figure, the flame tube 2 has a connecting ring 21, and a connecting ring groove 41 is formed on the end face of the second connector 4. In some other embodiments different from those shown in the figure, the connecting ring may be disposed on the second connector, while the groove is disposed on the flame tube.

[0035] Under operating conditions, such as Figure 1 As shown, the airflow entering the combustion chamber is divided into three streams: outer annular cavity air 71, head intake air 72, and inner annular cavity air 73. The outer annular cavity air 71 is divided into two streams: air 711 for cooling the flame tube and air 712 flowing out from the outer annular cavity outlet. Similarly, the inner annular cavity air 73 is divided into two streams: air 731 for cooling the flame tube and air 732 flowing out from the inner annular cavity outlet. The head intake air 72 mixes with fuel in the combustion chamber head 20 and then burns in the flame tube 2. The high-temperature gas produced scours the flame tube 2 and its downstream area at high temperature.

[0036] During assembly, the connecting ring 21 at the end of the flame tube 2 is inserted into the connecting ring groove 41 on the end face of the second connector 4, with a certain axial clearance x reserved. This ensures that the flame tube can float freely along the axial direction, reducing the stress at the flame tube outlet connection position, improving the service life of the flame tube, and enhancing the reliability of the connection structure. Simultaneously, a first cooling hole 40 is provided in the second connector 4. This allows for heat exchange between the overall wall temperature of the second connector 4 and the cooling airflow passing through the first cooling hole 40, thereby reducing the thermal stress of the connection section. Through the synergistic effect of both, considering the deformation caused by the heat load of the flame tube, the failure of the second connector 4 due to heat deformation is avoided. Simultaneously, effective cooling of the vicinity of the second connector 4 is achieved, solving the problem of easy failure of the flame tube connection structure due to heat deformation.

[0037] 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.

[0038] 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.

[0039] In some embodiments of this combustion chamber, the flame tube 2 is provided with a plurality of second cooling holes 22. These second cooling holes 22 are spaced apart along the axial direction a of the flame tube 2 in the tube wall near the connecting ring 21 and / or in the connecting ring 21. In the description of the embodiments in this application, the term "and / or" merely describes the relationship between related objects, indicating that three relationships can exist, such as A and / or B, which can represent: A existing alone, A and B existing simultaneously, and B existing alone. For example, in the embodiment shown in the figure, a plurality of second cooling holes 22 are simultaneously provided in the tube wall of the flame tube 2 and in the connecting ring 21. By providing multiple rows of second cooling holes 22 at the end of the flame tube 2, a cooling gas film protection effect is formed at the front end of the second connector 4, reducing the wall temperature at the front end of the second connector 4, preventing overheating failure of the connection structure due to interruption of gas film cooling at this point, and improving the service life of the connection structure.

[0040] In one specific embodiment, along the radial direction b of the flame tube 2, there is a radial gap 210 between the connecting ring 21 and the connecting ring groove 41. This gap controls the amount of cooling gas leakage, ensures easy disassembly and assembly, and facilitates the axial displacement of the flame tube 2.

[0041] Furthermore, in some embodiments of this combustion chamber, such as Figure 2 as well as Figure 3 As shown, each second cooling hole 22 is inclined towards the second connector 4 from the outside to the inside of the flame tube 2. That is, the inlet of the second cooling hole 22 on the outer wall of the flame tube 2 is closer to the first connector 3 than the outlet of the second cooling hole 22 on the inner wall of the flame tube 2. This configuration ensures that when the airflow passes through the second cooling hole 22 from the outside of the flame tube 2 and enters the inside of the flame tube 2 for purging, ... Figure 3 As shown, it can be purged and cooled toward the second connector 4 to reduce the front wall temperature of the second connector 4.

[0042] Furthermore, in some embodiments of this combustion chamber, such as Figure 2 as well as Figure 3 As shown, the first cooling hole 40 is arranged at an angle relative to the central axis of the flame tube 2. It can be understood that the flame tube 2 is a rotating body, and the central axis of the flame tube 2 is the axis of rotation of this rotating body structure.

[0043] Furthermore, in some embodiments of this combustion chamber, such as Figure 3 As shown, each of the first cooling holes 40 has an included angle with the central axis of the flame tube. From the first connector 3 to the second connector 4, the included angle between the first cooling hole 40 and the central axis of the flame tube 2 gradually increases from an acute angle to an obtuse angle. Specifically, as... Figure 3 As shown, the first cooling hole 40 includes, sequentially from the first connector 3 to the second connector 4, a first cooling hole 40a, a first cooling hole 40b, a first cooling hole 40c, and a first cooling hole 40d. The opening direction of the first cooling hole 40a forms an acute angle of approximately 30° with the central axis of the flame tube 2. The opening direction of the first cooling hole 40b forms an acute angle of approximately 60° with the central axis of the flame tube 2. The opening direction of the first cooling hole 40c forms an obtuse angle of approximately 120° with the central axis of the flame tube 2. The opening direction of the first cooling hole 40d forms an obtuse angle of approximately 150° with the central axis of the flame tube 2. This arrangement allows the inclination angle of the first cooling holes 40 along the axial direction to gradually transition from forward inclination (40a, 40b) in the first two rows to backward inclination (40c, 40d), thus solving the problem of interruption of the front-end air film. The forward inclination angle design of the first cooling holes 40 (40a, 40b) in the first two rows creates a reverse penetration effect on the mainstream, resulting in a significant improvement in the cooling effect of the first few rows of air film in the second connector 4. This helps to reduce the front wall temperature of the second connector 4. The angle transition design helps to maintain the continuity and uniformity of the air film, resulting in a lower overall wall temperature and more uniform distribution of the second connector 4. This helps to reduce the thermal stress of the second connector 4 and further improve the service life of the connection structure.

[0044] In some embodiments of this combustion chamber, the second connecting member 4 further includes a connecting section 42 and a fixing part 43. The fixing part 43 is fixedly connected to the other side of the casing 1, and the connecting section 42 connects the fixing part 43 and the connecting ring groove 41. The first cooling hole 40 is formed in the connecting section 42.

[0045] In some embodiments of this combustion chamber, a heat insulation plate 44 is provided on the fixing part 43, and the heat insulation plate 44 is arranged outward in a flared shape towards the outside of the fixing part 43. By providing the heat insulation plate 44 on the fixing part 43, the high-temperature reflow zone 82 is blocked, the range of the high-temperature zone is controlled, the heat transferred from the high-temperature reflow zone 82 to the casing end face 11 through the second connector 4 is reduced, and the casing 1 with a low temperature resistance level is prevented from overheating.

[0046] In some embodiments of this combustion chamber, an air duct 430 is provided in the fixing part 43. The air duct 430 is opened on the inner side of the heat insulation plate 44 along the axial direction of the flame tube 2. The airflow passes through the air duct 430 to blow away the high-temperature recirculation zone 82 attached to the wall, reduce the wall temperature of the end face of the fixing part 43 of the second connector 4, and avoid the end face of the fixing part 43 of the second connector 4 from overheating and failing.

[0047] In some embodiments of this combustion chamber, the fixing part 43 is fixedly connected to the casing 1 by bolts, and the heat insulation plate 44 is welded to the end face of the fixing part 43.

[0048] On the other hand, according to some embodiments of this application, a gas turbine is also provided, which includes a combustion chamber as described above.

[0049] 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.

[0050] 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 combustion chamber, characterized in that, include: Casing; The flame tube is disposed inside the casing; The first connector, on one side of the casing, fixes one end of the flame tube near the head of the combustion chamber to the casing. as well as The second connector is fixedly connected to the other side of the casing; The second connector has a first cooling hole. One of the flame tube and the second connector has a connecting ring, and the other has a connecting ring groove. The connecting ring and the connecting ring groove can be inserted into each other so that the flame tube is supported in the casing by the first connector and the second connector. In the assembled state, the connecting ring and the bottom wall of the connecting ring groove are separated by a distance.

2. The combustion chamber as described in claim 1, characterized in that, The flame tube has the connecting ring, and a connecting ring groove is formed on the end face of the second connector.

3. The combustion chamber as described in claim 2, characterized in that, The flame tube is provided with a plurality of second cooling holes, which are arranged at intervals along the axial direction of the flame tube in the tube wall near the connecting ring and / or in the connecting ring.

4. The combustion chamber as described in claim 3, characterized in that, Each of the second cooling holes is inclined toward the second connector from the outside of the flame tube to the inside of the flame tube.

5. The combustion chamber as described in claim 1, characterized in that, The first cooling hole is arranged at an angle relative to the central axis of the flame tube.

6. The combustion chamber as described in claim 5, characterized in that, Each of the first cooling holes has an included angle with the central axis of the flame tube, and the included angle gradually increases from an acute angle to an obtuse angle from the first connector to the second connector.

7. The combustion chamber as described in claim 6, characterized in that, The second connector further includes a connecting section and a fixing part, the fixing part being fixedly connected to the other side of the housing, and the connecting section connecting the fixing part and the connecting ring groove; The first cooling hole is located in the connecting section.

8. The combustion chamber as described in claim 7, characterized in that, A heat insulation plate is provided on the fixing part, and the heat insulation plate is arranged in an outwardly flared shape towards the outside of the fixing part.

9. The combustion chamber as claimed in claim 7, characterized in that, An air vent is provided in the fixing part.

10. A gas turbine, characterized in that, Includes the combustion chamber as described in any one of claims 1 to 9.

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