CN114046539B - Head structure of casing of back-flow combustion chamber - Google Patents
Head structure of casing of back-flow combustion chamber Download PDFInfo
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- CN114046539B CN114046539B CN202111127954.5A CN202111127954A CN114046539B CN 114046539 B CN114046539 B CN 114046539B CN 202111127954 A CN202111127954 A CN 202111127954A CN 114046539 B CN114046539 B CN 114046539B
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- casing
- shell
- cone
- flame tube
- fuel nozzle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
- F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
- F23R3/42—Continuous combustion chambers using liquid or gaseous fuel characterised by the arrangement or form of the flame tubes or combustion chambers
- F23R3/54—Reverse-flow combustion chambers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
- F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
- F23R3/02—Continuous combustion chambers using liquid or gaseous fuel characterised by the air-flow or gas-flow configuration
- F23R3/26—Controlling the air flow
Abstract
The invention discloses a head structure of a casing of a backflow combustion chamber, which is arranged in an engine cavity and used for installing a fuel nozzle, and is connected with a flame tube arranged in a casing shell through the fuel nozzle; the C-shaped cavity is arranged in the mounting section shell, the overall structure is simple, the mounting and dismounting are convenient, and the inner wall of the C-shaped cavity is open compared with the traditional head structure, so that the excessive fuel oil and sand dust can be effectively prevented from being deposited in the C-shaped cavity, and the later maintenance is convenient. The top end face of the flow guiding cone and the casing shell form a certain inclination angle, the flow guiding cone can guide combustion-supporting gas introduced by an airflow channel inside the casing shell of the combustion chamber, an air curtain is formed on the end face of the C-shaped cavity, the airflow direction of the head of the casing of the combustion chamber is regulated and limited, and airflow disturbance to the head of the casing of the combustion chamber is reduced.
Description
Technical Field
The invention belongs to the technical field of aero-engines, and particularly relates to a head structure of a casing of a backflow combustion chamber.
Background
The gas turbine backflow combustor generally comprises a casing 11, a flame tube 2 and a fuel nozzle 5, and as shown in fig. 1, the casing 1 outside the combustor mainly acts to transmit force, bear the pressure difference between the inside and the outside of the casing 1, and form a passage for air flowing in the combustor together with the flame tube 2, so that the inner profile of the casing 1 outside the combustor has a great influence on the performance of the backflow combustor.
In the existing head structure of the casing of the reflow combustion chamber, in order to form a stable external flow field of the head of the flame tube and ensure that the temperature field of the outlet of the combustion chamber component meets the design requirements, a guide plate 106 needs to be installed on the head of the casing of the reflow combustion chamber so as to guide the nearby airflow to avoid the disturbance of the wall surface of the head of the casing of the combustion chamber. The guide plate 106 is fixed on the head of the combustion chamber casing by welding two welding seams, and one of the disadvantages is that the welding structure is easy to cause deformation of the casing, which is not beneficial to processing and forming of the combustion chamber; secondly, fuel oil and sand accumulation is easily generated between the guide plate 106 and the cavity of the casing head, and the cavity is difficult to clean due to narrow space.
Disclosure of Invention
In order to solve the problems, the invention discloses a head structure of a casing of a backflow combustion chamber, which is arranged in an engine cavity and used for installing a fuel nozzle, and is connected with a flame tube arranged in the casing through the fuel nozzle, wherein the head structure comprises:
the casing shell is connected with the flame tube through the fuel nozzle arranged on the casing shell; wherein the content of the first and second substances,
the casing shell comprises a horizontal section shell, an installation section shell and a vertical section shell, wherein the tail end of the horizontal section shell is connected with the vertical section shell through the installation section shell, a drainage cone is arranged at the joint of the inner wall of the horizontal section shell and the installation section shell, and the wall thickness of the installation position of the drainage cone is larger than that of the installation section shell.
Preferably, the mounting section shell is internally provided with a C-shaped cavity for forming a mounting space of the fuel nozzle.
Preferably, the outer wall of the mounting section shell is provided with a mounting platform, and the mounting platform is provided with a through hole penetrating through the mounting section shell and used for fixedly mounting the fuel nozzle.
Preferably, the fuel nozzle is communicated with a fuel supply unit of the engine through a combustion manifold.
Preferably, an air flow channel is arranged between the inner wall of the casing body and the outer wall of the flame tube, and the air flow channel is communicated with the C-shaped cavity.
Preferably, a diffuser is fixedly arranged in the gas flow channel and used for stabilizing the gas flow speed of the combustion-supporting gas passing through the gas flow channel.
Preferably, the flame tube further comprises a swirler assembly arranged at the input end of the flame tube;
the output end of the fuel nozzle is connected with the flame tube through a swirler assembly, and the swirler assembly is used for conveying combustion-supporting gas to the interior of the flame tube.
Preferably, the top end face of the preset drainage cone is provided with a conical bus along the inclined direction of the conical surface, an included angle between the conical bus and the central axis of the engine is set as A1, and 45 degrees < A1<90 degrees.
Preferably, the minimum distance between the preset diversion cone and the flame tube is L1, the vertical distance between the cone vertex of the preset diversion cone and the inner wall of the casing shell is L2, and L1 is more than or equal to 4L2.
Preferably, the joint of the outer wall of the horizontal section shell and the outer wall of the installation section shell is of an arc-shaped structure and is used for supporting the engine cavity.
The C-shaped cavity is arranged in the mounting section shell and used for forming a mounting space of the fuel nozzle, the overall structure is simple, the mounting and dismounting are convenient, and compared with the traditional head structure, the inner wall of the C-shaped cavity is arranged in an open mode, so that redundant fuel and sand dust can be effectively prevented from being deposited in the C-shaped cavity, and the later maintenance is convenient. A certain inclination angle exists between the top end face of the drainage cone and the casing shell, the drainage cone can guide combustion-supporting gas introduced by an airflow channel inside the combustion chamber casing shell, an air curtain is formed on the end face of the C-shaped cavity, the airflow direction of the head of the combustion chamber casing is regulated and limited, and airflow disturbance to the head of the combustion chamber casing is reduced.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 illustrates a schematic view of a conventional combustor case head structure according to the prior art;
FIG. 2 illustrates an assembly view of a combustor case head structure according to an embodiment of the present invention;
FIG. 3 illustrates a schematic view of a combustor case head structure according to an embodiment of the present invention;
fig. 4 shows a partially enlarged schematic view at C in fig. 2 according to an embodiment of the present invention.
In the drawings: 1. a case housing; 2. a flame tube; 3. a diffuser; 4. a combustion manifold; 5. a fuel nozzle; 101. a horizontal section housing; 102. a vertical section housing; 103. a drainage cone; 104. a C-shaped cavity; 105. mounting a segment housing; 106. a baffle; 201. a swirler assembly.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
The invention provides a combustor casing head structure which can reduce airflow disturbance, has simple structure, convenient maintenance and easy processing for a gas turbine engine reflux combustor, and solves the problem that the traditional combustor casing head structure needs to be welded with a guide plate 106, on one hand, the welding structure easily causes deformation of the casing and is not beneficial to processing and forming of the combustor; on the other hand, fuel oil and sand accumulation is easily generated between the cavity of the guide plate 106 and the head of the casing, and the cavity is difficult to clean due to narrow space.
In one embodiment of the present invention, referring to fig. 2, the head structure is arranged inside an engine cavity, is used for installing a fuel nozzle 5, and is connected with a flame tube 2 arranged inside a casing shell 1 through the fuel nozzle 5, and comprises the casing shell 1, and is connected with the flame tube 2 through the fuel nozzle 5 arranged on the casing shell 1; as shown in fig. 3, the casing housing 1 includes a horizontal casing 101, a mounting casing 105, and a vertical casing 102, the end of the horizontal casing 101 is connected to the vertical casing 102 through the mounting casing 105, a drainage cone 103 is disposed at a connection between an inner wall of the horizontal casing 101 and the mounting casing 105, and a wall thickness of a mounting position of the drainage cone 103 is greater than a wall thickness of the mounting casing 105.
In this embodiment, the mounting section housing 105 is provided with a C-shaped cavity 104 inside for forming a mounting space of the fuel nozzle 5, the outer wall of the mounting section housing 105 is provided with a mounting platform, and the mounting platform is provided with a through hole penetrating through the mounting section housing 105 for fixedly mounting the fuel nozzle 5.
Further, the diameter of through-hole is greater than the main part diameter of fuel nozzle 5, fuel nozzle 5 can freely insert fuel nozzle 5's output in the through-hole when assembling, is connected at the inside of casing 1 and predetermines swirler subassembly 201 at the flame tube 2 input, because the clearance between fuel nozzle 5 and the through-hole inner wall exists for the assembling process is comparatively convenient and fast. After the assembly is completed, the end flange of the fuel nozzle 5 is matched and fixed with the mounting platform. Certainly, in order to guarantee the sealing effect and the structural stability, the end flange and the mounting platform are fixed in a bolt connection mode, and the sealing gap needs to be supplemented with a sealing gasket when being connected, so that the sealing performance of the internal C-shaped cavity 104 is guaranteed, and the disturbance of the airflow inside the C-shaped cavity 104 is avoided.
Still further, the inner wall of C shape cavity 104 compares and is uncovered formula setting for traditional head structure, can effectively avoid unnecessary fuel and dust deposit in the inside of C shape cavity 104, conveniently carries out the later maintenance.
In one embodiment of the present invention, an airflow channel is provided between the inner wall of the casing housing 1 and the outer wall of the combustor basket 2, and the airflow channel is communicated with the C-shaped cavity 104. The combustion-supporting air flow device is characterized in that a diffuser 3 is fixedly arranged in the air flow channel, the diffuser 3 is perpendicular to the direction of air flow and is arranged in the air flow channel, introduced combustion-supporting air is collected from the input end of the air flow channel and is stably led out from the output end of the air flow channel, and the combustion-supporting air flow speed is stabilized through the air flow channel.
In the present embodiment, the fuel injection nozzle 5 communicates with the fuel supply unit of the engine through the combustion manifold 4. The fuel nozzle 5 is a nozzle special for atomizing fuel, can generate hollow or solid spray, and the spray angle can be adjusted corresponding to the spray angle of the fuel nozzle 5, and the general spray angle is set to be 30, 45, 60 or 80 degrees, and can be adaptively selected according to requirements.
Referring to fig. 4, in an embodiment of the present invention, the drainage cone 103 is disposed on an inner wall of a distal end of the horizontal casing 101, the drainage cone 103 is a triangular prism structure, one side surface of the triangular prism is fixed on the inner wall of the horizontal casing 101, an adjacent side surface is tangent to the inner wall of the through hole, the other side surface of the triangular prism is a top end surface, a conical bus is disposed on the top end surface of the drainage cone 103 along a direction of a conical surface inclination, an included angle between the conical bus and a central axis of the engine is A1, and a value of the A1 is 45 ° < A1<90 °. Thereby guarantee to have certain inclination between the top terminal surface of drainage awl 103 and the machine casket casing 1, the drainage awl 103 can guide the combustion-supporting gas that the inside airflow channel of combustion chamber machine casket casing 1 introduced to can adjust the restriction to the air current flow direction of combustion chamber machine casket head, form the gas curtain on the terminal C shape cavity 104 surface of drainage awl 103, reduce the air current disturbance to combustion chamber machine casket head.
Further, the minimum distance from the preset guide flow cone 103 to the shell of the flame tube 2 is L1, the vertical distance from the cone vertex of the preset guide flow cone 103 to the inner wall of the casing shell 1 is L2, and the size of L1 is at least 4 times of the size of L2.
In one embodiment of the invention, the value of the included angle A1 between the conical generatrix and the central axis of the engine can be verified in advance according to multiple requirements. For example, the value of A1 may be selected from 45 ° to 90 °, and multiple sets of repeated tests may be performed at intervals of 5 ° from the end point in the range of 45 ° to 90 °, and data is measured, so as to find a set of data with the best combustion effect under the same combustion condition, and with the angle A1 at this time as a reference value, the interval angle is reduced, and a more optimal value of the included angle A1 is further found along the periphery of the reference value. Certainly, while the value of the A1 is taken, the minimum distance L1 from the flow guide cone 103 to the flame tube 2 shell and the vertical distance L2 from the cone vertex of the flow guide cone 103 to the inner wall of the casing shell 1 also need to be taken as the values, and the limiting condition that L1 is more than or equal to 4L2 is met.
Wherein, the limitation requirements of the angle size and the distance size of 45 degrees < A1<90 degrees and L1 is more than or equal to 4L2 are simultaneously satisfied, and when the limitation of the angle size of A1 and the distance between L1 and L2 exceeds the range, the flow guiding function of the flow guiding cone 103 is disabled. Meanwhile, the airflow at the input end of the flame tube 2 is interfered, so that the mixing condition of atomized fuel oil and combustion-supporting gas is easily influenced, the overall combustion performance of the combustion chamber is negatively influenced, and the combustion efficiency is reduced.
As an embodiment of the present invention, the structure of the horizontal casing 101, the installation casing 105, the vertical casing 102 and the flow guiding cone 103 may be forged in an integrated forging manner, so as to avoid repeated use of welding methods to connect the components during the machining process, on one hand, the strength of the welding seam during the welding process is difficult to be ensured, the normal operation of the combustion chamber is easily affected by the weld seam desoldering during the use process, and on the other hand, the structure deformation is easily generated around the welding seam during the welding process, so that the influence is caused to the overall structure of the casing 1, and the local airflow is disturbed.
The forged steel billets of the horizontal section shell 101, the mounting section shell 105, the vertical section shell 102 and the guide cone 103 have certain thickness requirements, and the specific thickness dimension is calculated and selected according to the internal and external pressure difference and the combustion intensity of the working combustion chamber, so that the forged combustion chamber casing shell 1 can keep certain strength requirements and has a certain supporting effect on other structures in the engine; meanwhile, the combustion chamber casing 1 forged by the billet can stably bear the internal and external pressure difference of the combustion chamber and the high-temperature combustion condition of a long-term working state, so that the condition that the casing 1 of the combustion chamber is locally deformed is avoided, and the stable work of the engine is protected.
In one embodiment of the present invention, the joint between the horizontal casing 101 and the outer wall of the installation casing 105 is an arc structure, and the arc structure is used as a part of a force bearing system of an engine and can support other structures in an inner cavity of the engine. When using, the arc structure can contradict other structures, and the stability of arc structure can support other structures to guarantee the structural stability of whole engine inner chamber.
The working principle of the invention is as follows: combustion-supporting gas is input into the gas flow channel from the gas inlet end of the casing body 1, the combustion-supporting gas is stably guided into the drainage cone 103 at the tail end of the gas flow channel under the pressure stabilizing effect of the diffuser 3, a gas curtain is formed on the end face of the C-shaped cavity 104 under the flow guiding effect of the drainage cone 103, the gas flow direction of the head of the combustion chamber casing is regulated and limited, the gas curtain is formed on the surface of the C-shaped cavity 104 at the tail end of the drainage cone 103, and the gas flow disturbance of the head of the combustion chamber casing is reduced; in addition, the combustion-supporting gas is absorbed by the switching of the swirler assembly 201, is fully mixed with the atomized fuel oil fed by the fuel nozzle 5, flows into the flame tube 2, and supports and assists the combustion process of the combustion chamber.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (5)
1. The utility model provides a backflow combustion chamber machine casket head structure, sets up inside the engine cavity for installation fuel nozzle (5) to connect through fuel nozzle (5) and set up in inside flame tube (2) of machine casket casing (1), its characterized in that, head structure includes:
the fuel nozzle is characterized by comprising a casing body (1) and a flame tube (2), wherein the casing body (1) is connected with the flame tube (2) through a fuel nozzle (5) arranged on the casing body (1); wherein the content of the first and second substances,
the casing shell (1) comprises a horizontal section shell (101), an installation section shell (105) and a vertical section shell (102), the tail end of the horizontal section shell (101) is connected with the vertical section shell (102) through the installation section shell (105), a drainage cone (103) is arranged at the joint of the inner wall of the horizontal section shell (101) and the installation section shell (105), and the wall thickness of the installation position of the drainage cone (103) is greater than that of the installation section shell (105);
the mounting section shell (105) is internally provided with a C-shaped cavity (104) for forming a mounting space of the fuel nozzle (5);
the outer wall of the mounting section shell (105) is provided with a mounting platform, and the mounting platform is provided with a through hole penetrating through the mounting section shell (105) in advance and used for fixedly mounting the fuel nozzle (5);
an airflow channel is arranged between the inner wall of the casing shell (1) and the outer wall of the flame tube (2), and the airflow channel is communicated with the C-shaped cavity (104);
the top end face of the preset diversion cone (103) is provided with a cone-shaped bus along the inclined direction of the cone surface, the included angle between the cone-shaped bus and the central axis of the engine is set to be A1, and the included angle is more than 45 degrees and less than A1 and less than 90 degrees;
the minimum distance between the preset flow guiding cone (103) and the flame tube (2) is L1, the vertical distance between the cone vertex of the preset flow guiding cone (103) and the inner wall of the casing shell (1) is L2, and L1 is more than or equal to 4L2.
2. A head structure according to claim 1, characterised in that the fuel injector (5) communicates with the engine's oil supply unit via a combustion manifold (4).
3. The head structure according to claim 1, characterized in that a diffuser (3) is fixedly arranged in the gas flow channel for stabilizing the gas flow velocity of the comburent gas passing through the gas flow channel.
4. A head structure according to any one of claims 1 to 3, characterized in that said flame tube (2) further comprises a swirler assembly (201) arranged at the input end of the flame tube (2);
the output end of the fuel nozzle (5) is connected with the flame tube (2) through a swirler assembly (201), and the swirler assembly (201) is used for conveying combustion-supporting gas into the flame tube (2).
5. The head structure of claim 1, wherein the junction of the outer walls of the horizontal section casing (101) and the mounting section casing (105) is an arc-shaped structure for supporting an engine cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111127954.5A CN114046539B (en) | 2021-09-26 | 2021-09-26 | Head structure of casing of back-flow combustion chamber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111127954.5A CN114046539B (en) | 2021-09-26 | 2021-09-26 | Head structure of casing of back-flow combustion chamber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114046539A CN114046539A (en) | 2022-02-15 |
| CN114046539B true CN114046539B (en) | 2023-04-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111127954.5A Active CN114046539B (en) | 2021-09-26 | 2021-09-26 | Head structure of casing of back-flow combustion chamber |
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Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59229114A (en) * | 1983-06-08 | 1984-12-22 | Hitachi Ltd | Combustor for gas turbine |
| US7007481B2 (en) * | 2003-09-10 | 2006-03-07 | General Electric Company | Thick coated combustor liner |
| US8899049B2 (en) * | 2011-01-07 | 2014-12-02 | General Electric Company | System and method for controlling combustor operating conditions based on flame detection |
| US20130263605A1 (en) * | 2012-04-04 | 2013-10-10 | General Electric | Diffusion Combustor Fuel Nozzle |
| CN110081462B (en) * | 2019-04-29 | 2021-04-02 | 天津天成智造科技有限公司 | Low-pollution combustion chamber |
| CN113028451B (en) * | 2021-03-23 | 2022-04-19 | 中国科学院工程热物理研究所 | Centrifugal nozzle and swirler integrated combustion chamber head structure |
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2021
- 2021-09-26 CN CN202111127954.5A patent/CN114046539B/en active Active
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