Gas turbine and combustion chamber thereof

Abstract

The invention aims to provide a gas turbine and a combustion chamber thereof. The combustion chamber comprises a casing, a flame tube arranged in the casing, a first connecting piece and a second connecting piece. The end, close to the head of the combustion chamber, of the flame tube is fixedly connected with the casing through the first connecting piece, the second connecting piece is fixedly connected with the other side of the casing, a first cooling hole is formed in the second connecting piece, one of the flame tube and the second connecting piece is provided with a connecting ring, and the other one is provided with a connecting ring groove. The connecting ring and the connecting ring groove can be connected in an inserted mode so that the flame tube can be jointly supported in the cartridge receiver through the first connecting piece and the second connecting piece, in the assembling state, the connecting ring and the groove bottom wall of the connecting ring groove are spaced by a certain distance, and the problem that the flame tube connecting structure is prone to failure after being heated and deformed can be solved through the combustion chamber.

Description

Technical Field

[0001] The present invention relates to the technical field of gas turbine engines, and in particular to a gas turbine and a combustion chamber thereof. Background Art

[0002] Gas turbine combustion chambers usually require a large number of component tests to verify the performance of the combustion chamber solution, including outlet temperature distribution tests, pollution emission tests, combustion efficiency tests, oscillation characteristics tests, thermal protection tests, etc. As the engine cycle parameters continue to increase, the combustion chamber outlet temperature continues to increase, and the combustion chamber outlet is subjected to the scouring of high-temperature combustion gas. The connection structure at the flame tube outlet needs to fully consider the deformation caused by the flame tube thermal load to avoid failure of the connection structure after relative deformation due to heat. At the same time, the cooling design near the connection structure also has considerable difficulties. These have brought huge challenges to the design and cooling of the connection structure at the combustion chamber flame tube outlet.

[0003] How to solve the problem that the flame tube connection structure is prone to failure after being deformed by heat is a challenge in the existing technology. Summary of the invention

[0004] The object of the present invention is to provide a combustion chamber which can solve the problem that the flame tube connection structure is prone to failure after being deformed by heat.

[0005] A combustion chamber for achieving the above-mentioned purpose comprises:

[0006] Receiver;

[0007] A flame tube disposed in the casing;

[0008] A first connecting member is provided on one side of the casing, and fixedly connects one end of the flame tube close to the combustion chamber head with the casing; and

[0009] A second connecting member, fixedly connected to the other side of the casing;

[0010] Among them, a first cooling hole is opened in the second connecting member, and one of the flame tube and the second connecting member has a connecting ring, and the other has a connecting ring groove. The connecting ring and the connecting ring groove can be plug-connected so that the flame tube is supported in the casing by the first connecting member and the second connecting member. In the assembled state, the connecting ring is spaced a distance from the bottom wall of the connecting ring groove.

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

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

[0013] In one or more embodiments, each of the second cooling holes is opened obliquely from the outer side of the flame tube to the inner side of the flame tube toward the second connecting piece.

[0014] In one or more embodiments, the first cooling holes are arranged obliquely with respect to a 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 size of the included angle gradually increases from an acute angle to an obtuse angle from the first connecting piece to the second connecting piece.

[0016] In one or more embodiments, the second connecting member further includes a connecting section and a fixing portion, the fixing portion is fixedly connected to the other side of the casing, and the connecting section connects the fixing portion and the connecting ring groove;

[0017] Wherein, the first cooling hole is opened in the connecting section.

[0018] In one or more embodiments, a heat insulation plate is disposed on the fixing portion, and the heat insulation plate is disposed in an outwardly expanding shape toward the outside of the fixing portion.

[0019] In one or more embodiments, an air ducting hole is provided in the fixing portion.

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

[0021] The beneficial effects of the present invention are:

[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 connecting member and reserving a certain axial clearance, it is ensured that the flame tube can float freely in the axial direction, reducing the stress at the flame tube outlet connection position, increasing the service life of the flame tube, and improving the reliability of the connection structure. At the same time, a first cooling hole is provided in the second connecting member, which can reduce the overall wall temperature of the second connecting member through heat exchange between the cooling airflow passing through the first cooling hole, thereby reducing the thermal stress of the connection section. Through the synergistic effect of the two, the deformation caused by the thermal load of the flame tube is considered to avoid the failure of the second connecting member after heat deformation, and at the same time, the area near the second connecting member is effectively cooled and cooled, solving the problem that the flame tube connection structure is prone to failure after heat deformation.

[0023] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0025] Figure 1 A half-section schematic diagram of some embodiments of the combustion chamber is shown;

[0026] Figure 2 A partial schematic diagram of some embodiments of the combustion chamber is shown;

[0027] Figure 3 for Figure 2 A partial enlarged schematic diagram of part A;

[0028] Figure 4 for Figure 2 A partial enlarged schematic diagram of part B. DETAILED DESCRIPTION

[0029] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0031] In order to solve the problem that the flame tube connection structure is easily ineffective after being deformed by heat, on the one hand, according to some embodiments of the present application, a combustion chamber is provided. Figure 1 shows a half-section schematic diagram of some embodiments of the combustion chamber, Figure 2 shows a partial schematic diagram of some embodiments of the combustion chamber, Figure 3 for Figure 2 A partial enlarged schematic diagram of part A, Figure 4 for Figure 2 A partial enlarged schematic diagram of part B.

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

[0033] The second connecting member 4 is provided with 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, and the connecting ring 21 and the connecting ring groove 41 can be plugged and connected, so that the flame tube 2 is supported by the first connecting member 3 and the second connecting member 4 in the casing 1. At the same time, in the assembled state, the connecting ring 21 is spaced apart from the bottom wall of the connecting ring groove 41 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 provided on the end surface of the second connecting member 4. In other embodiments different from those shown in the figure, the connecting ring can also be provided on the second connecting member, and the ring groove can be provided on the flame tube.

[0035] In working conditions, such as Figure 1 As shown, the air flow entering the combustion chamber is divided into three streams, including outer ring cavity air 71, head air intake 72 and inner ring cavity air 73, wherein the outer ring cavity air 71 is divided into two streams, including air 711 for cooling the flame tube and air 712 flowing out from the outer ring cavity outlet; similarly, the inner ring cavity air 73 is divided into two streams, including air 731 for cooling the flame tube and air 732 flowing out from the inner ring cavity outlet; the head air intake 72 is mixed with the fuel in the combustion chamber head 20 and then burns in the flame tube 2, and the high-temperature combustion gas generated performs high-temperature flushing on the flame tube 2 and its downstream.

[0036] During assembly, the connection ring 21 at the end of the flame tube 2 is inserted into the connection ring groove 41 on the end face of the second connecting member 4, and a certain axial gap x is reserved to ensure that the flame tube can float freely in the axial direction, reduce the stress at the flame tube outlet connection position, increase the service life of the flame tube, and improve the reliability of the connection structure. At the same time, a first cooling hole 40 is opened in the second connecting member 4, which can reduce the overall wall temperature of the second connecting member 4 through heat exchange between the cooling airflow passing through the first cooling hole 40, thereby reducing the thermal stress of the connection section. Through the synergistic effect of the two, the deformation caused by the thermal load of the flame tube is considered to avoid the failure of the second connecting member 4 after heat deformation, and at the same time, the area near the second connecting member 4 is effectively cooled and cooled, solving the problem that the flame tube connection structure is prone to failure after heat deformation.

[0037] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0038] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0039] In some embodiments of the present combustion chamber, a plurality of second cooling holes 22 are provided on the flame tube 2, and the plurality of second cooling holes 22 are provided in the wall of the flame tube 2 near the connecting ring 21 and / or in the connecting ring 21 at intervals along the axial direction a of the flame tube 2. In the description of the embodiments of the present application, the term "and / or" is merely a description of the association relationship of associated objects, indicating that three relationships may exist, such as A and / or B, which may represent: A exists alone, A and B exist at the same time, and B exists alone. For example, in the embodiment shown in the figure, a plurality of second cooling holes 22 are provided in the wall of the flame tube 2 and in the connecting ring 21 at the same time. By arranging multiple rows of second cooling holes 22 at the end of the flame tube 2, a cooling air film protection effect is formed at the front end of the second connecting member 4, the wall temperature at the front end of the second connecting member 4 is reduced, and the over-temperature failure of the connecting structure due to the interruption of the air film cooling at this location is avoided, thereby increasing the service life of the connecting structure.

[0040] In a 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, which controls the leakage of cooling gas to ensure easy disassembly and assembly, and facilitates the axial displacement of the flame tube 2.

[0041] Further, in some embodiments of the combustion chamber, Figure 2 as well as Figure 3 As shown in FIG. 1 , each second cooling hole 22 is opened obliquely from the outside of the flame tube 2 to the inside of the flame tube 2 toward the second connecting member 4. That is, the inlet of the second cooling hole 22 formed on the outer wall of the flame tube 2 is closer to the first connecting member 3 than the outlet of the second cooling hole 22 formed on the inner wall of the flame tube 2. This configuration allows the airflow to pass through the second cooling hole 22 from the outside of the flame tube 2 and then enter the inside of the flame tube 2 for purging. Figure 3 As shown, the second connecting member 4 can be purged and cooled to reduce the temperature of the front end wall of the second connecting member 4 .

[0042] Further, in some embodiments of the combustion chamber, Figure 2 as well as Figure 3 As shown, the first cooling hole 40 is arranged obliquely 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 rotation axis of the rotating body structure.

[0043] Further, in some embodiments of the combustion chamber, Figure 3 As shown, each first cooling hole 40 has an angle with the central axis of the flame tube, and from the first connecting member 3 to the second connecting member 4, the 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 holes 40 include a first cooling hole 40a, a first cooling hole 40b, a first cooling hole 40c and a first cooling hole 40d from the first connecting member 3 to the second connecting member 4 in sequence. The angle between the opening direction of the first cooling hole 40a and the central axis of the flame tube 2 is an acute angle of about 30°, the angle between the opening direction of the first cooling hole 40b and the central axis of the flame tube 2 is an acute angle of about 60°, the angle between the opening direction of the first cooling hole 40c and the central axis of the flame tube 2 is an obtuse angle of about 120°, and the angle between the opening direction of the first cooling hole 40d and the central axis of the flame tube 2 is an obtuse angle of about 150°. Such arrangement makes the inclination angle of the first cooling holes 40 along the axial air film holes gradually transition from the forward inclination (40a, 40b) of the first two rows to the backward inclination (40c, 40d) to solve the problem of air film interruption at the front end. The forward inclination angle design of the first two rows of first cooling holes 40 (40a, 40b) forms a reverse penetration effect on the mainstream, which brings the benefit of significantly improving the cooling effect of the air film in the first few rows of the second connecting member 4, which is beneficial to reducing the wall temperature at the front end of the second connecting member 4, and the angle transition design is beneficial to maintaining the continuity and uniformity of the air film, so that the overall wall temperature of the second connecting member 4 is lower and more evenly distributed, which is beneficial to reducing the thermal stress of the second connecting member 4 and further improving the service life of the connection structure.

[0044] In some embodiments of the combustion chamber, the second connecting member 4 also includes a connecting section 42 and a fixing portion 43, the fixing portion 43 is fixedly connected to the other side of the casing 1, the connecting section 42 connects the fixing portion 43 and the connecting annular groove 41, wherein the first cooling hole 40 is opened in the connecting section 42.

[0045] In some embodiments of the combustion chamber, a heat shield 44 is provided on the fixing portion 43, and the heat shield 44 is provided in an outwardly expanding shape toward the outside of the fixing portion 43. The heat shield 44 is provided on the fixing portion 43 to block the high-temperature reflow zone 82, control the range of the high-temperature area, reduce the heat transferred from the high-temperature reflow zone 82 to the casing end face 11 through the second connecting member 4, and avoid overheating of the casing 1 with a low temperature resistance level of the material.

[0046] In some embodiments of the present combustion chamber, an air bleed hole 430 is opened in the fixed portion 43. The air bleed hole 430 is opened on the inner side of the heat insulation plate 44 and along the axial direction of the flame tube 2. The air flow passes through the air bleed hole 430 to blow away the high-temperature reflow zone 82 attached to the wall, thereby reducing the wall temperature of the end face of the fixed portion 43 of the second connecting member 4 and avoiding over-temperature failure of the end face of the fixed portion 43 of the second connecting member 4.

[0047] In some embodiments of the combustion chamber, the fixing portion 43 is fixedly connected to the casing 1 by bolts, and the heat shield 44 is welded to the end surface of the fixing portion 43 .

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

[0049] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present 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 the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A combustion chamber, characterized in that: include: Receiver; A flame tube disposed in the casing; A first connecting piece is provided on one side of the casing, and fixedly connects one end of the flame tube close to the combustion chamber head with the casing; as well as A second connecting member, fixedly connected to the other side of the casing; Among them, a first cooling hole is opened in the second connecting member, and one of the flame tube and the second connecting member has a connecting ring, and the other has a connecting ring groove. The connecting ring and the connecting ring groove can be plug-connected so that the flame tube is supported in the casing by the first connecting member and the second connecting member. In the assembled state, the connecting ring is spaced a distance from the bottom wall of the connecting ring groove.

2. The combustion chamber according to claim 1, characterized in that The flame tube has the connecting ring, and a connecting ring groove is formed on the end surface of the second connecting piece.

3. The combustion chamber according to 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 of the flame tube close to the connecting ring and / or in the connecting ring.

4. The combustion chamber according to claim 3, characterized in that Each of the second cooling holes is opened obliquely from the outer side of the flame tube to the inner side of the flame tube toward the second connecting piece.

5. The combustion chamber according to claim 1, characterized in that The first cooling holes are arranged obliquely relative to the central axis of the flame tube.

6. The combustion chamber according to claim 5, characterized in that An included angle is respectively formed between each of the first cooling holes and the central axis of the flame tube, and the size of the included angle gradually increases from an acute angle to an obtuse angle from the first connecting piece to the second connecting piece.

7. The combustion chamber according to claim 6, characterized in that The second connecting member further comprises a connecting section and a fixing portion, wherein the fixing portion is fixedly connected to the other side of the casing, and the connecting section connects the fixing portion and the connecting ring groove; Wherein, the first cooling hole is opened in the connecting section.

8. The combustion chamber according to claim 7, characterized in that A heat insulation board is arranged on the fixing part, and the heat insulation board is arranged in an outwardly expanding shape toward the outside of the fixing part.

9. The combustion chamber according to claim 7, characterized in that An air ducting hole is provided in the fixing portion.

10. A gas turbine, characterized in that: Comprising a combustion chamber as claimed in any one of claims 1 to 9.

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