CN113154456B - Head structure of casing of backflow combustion chamber, manufacturing method of head structure and engine combustion chamber - Google Patents
Head structure of casing of backflow combustion chamber, manufacturing method of head structure and engine combustion chamber Download PDFInfo
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- CN113154456B CN113154456B CN202110405510.7A CN202110405510A CN113154456B CN 113154456 B CN113154456 B CN 113154456B CN 202110405510 A CN202110405510 A CN 202110405510A CN 113154456 B CN113154456 B CN 113154456B
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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
- F23R3/42—Continuous combustion chambers using liquid or gaseous fuel characterised by the arrangement or form of the flame tubes or combustion chambers
- F23R3/58—Cyclone or vortex type combustion chambers
Abstract
The invention discloses a head structure of a casing of a reflow combustion chamber, a manufacturing method thereof and an engine combustion chamber, wherein the head structure of the casing of the reflow combustion chamber adopts an annular base body structure and comprises an arched bearing beam and a nozzle part which are alternately distributed along the circumferential direction of the annular base body structure, and the arched bearing beam and the nozzle part are in smooth transition connection by adopting an arc surface; the arched bearing beam is of a base body structure with an arched cross section, and the radial size of the arched bearing beam is gradually reduced from the combustion chamber casing to the turbine casing; the nozzle part comprises a nozzle mounting surface which is positioned between two adjacent arched bearing beams and is parallel to the head of the flame tube, and a connecting surface which is positioned at the bottom end of the nozzle mounting surface and is vertically arranged with the nozzle mounting surface, and the nozzle mounting surface is in smooth transition connection with the connecting surface. The head structure of the casing of the backflow combustion chamber is similar to a frame structure, does not deform under the action of load, always ensures that the rotor and the stator of the engine are concentric, and avoids the problems of scraping and grinding of the rotor, vibration and the like.
Description
Technical Field
The invention relates to the field of gas turbine engine combustors, in particular to a head structure of a casing of a backflow combustor. In addition, the invention also relates to a manufacturing method of the reflow combustion chamber casing head structure and an engine combustion chamber.
Background
In the field of small and medium-sized aeroengines, in a combustion chamber of a gas turbine engine, a combustion chamber casing is used as a shell of a combustion chamber part and mainly used for containing and supporting a flame tube to form an internal flow passage of the engine and simultaneously carrying a gas compressor casing and a turbine casing. The combustion chamber casing is used as an important bearing part of the engine, not only bears the high-pressure air pressure of the combustion chamber part, but also transfers the pneumatic and maneuvering loads generated by various parts of the engine, and the working condition of the combustion chamber casing is very harsh when the combustion chamber casing is used as a hot end casing. Because the engine speed is very high, in order to alleviate the rotordynamics problem, a backflow combustion chamber structure is often adopted to shorten the length of a shaft system. The combustor casing head is a unique structure of the reflow combustor casing, mainly because in the reflow combustor, the turbine part is generally wrapped inside the combustor part, the connection position of the combustor casing and the turbine casing forms a radial drop, and the flame tube head is located at the rear of the combustor, so the structure of the casing connecting the combustor casing and the turbine casing and wrapping the flame tube head is called the combustor casing head, as shown in fig. 1.
During normal operation of the engine, a pressure of over ten atmospheres may be reached inside the combustion chamber casing, and the combustion chamber casing will also bear the aerodynamic load applied to various components by high-pressure gas flowing in the engine, the torque, tension and 1P load (turboprop engine) generated during normal operation of the propeller, and the inertial load of various components of the engine caused by the airplane during maneuvering flight. On the other hand, the combustion chamber casing is positioned at the hot end part of the engine, the wall temperature of the combustion chamber casing can reach 400-500 ℃, the yield limit of working materials can be reduced under the high-temperature condition, and the strength design of the combustion chamber casing faces a greater challenge. In an engine adopting a backflow combustion chamber structure, a turbine part is generally wrapped inside the combustion chamber part, a certain drop exists between the two parts in the radial height, and a combustion chamber casing is connected with the turbine casing by overcoming the height drop between the combustion chamber and the turbine. When the gas turbine engine works, the head of the combustion chamber casing is stressed and loaded greatly, and for the backflow combustion chamber casing, stress concentration is easily formed at a part with severely changed radial dimension and exceeds the stress limit of allowable use of materials, and local deformation is easily caused at the stress concentration part to influence the safety of the engine.
Disclosure of Invention
The invention provides a head structure of a casing of a reflow combustion chamber, a manufacturing method thereof and an engine combustion chamber, which aim to solve the technical problems that the head of the casing of the existing combustion chamber is subjected to large stress and load, exceeds the allowable stress limit of materials, is easy to generate local deformation and affects the safety of an engine.
The technical scheme adopted by the invention is as follows:
a head structure of a casing of a backflow combustion chamber is positioned between the casing of the combustion chamber and a turbine casing and used for wrapping the head of a flame tube, the head structure of the casing of the backflow combustion chamber adopts an annular base body structure, one end of the head structure of the casing of the backflow combustion chamber is connected with the casing of the combustion chamber, and the other end of the head structure of the casing of the backflow combustion chamber is connected with the turbine casing; the head structure of the casing of the reflow combustion chamber comprises an arched bearing beam and a nozzle part which are alternately arranged along the circumferential direction of the annular base body structure, and the arched bearing beam and the nozzle part are in smooth transition connection by adopting an arc surface; the arched bearing beam adopts a base body structure with an arched cross section, and the radial dimension of the arched bearing beam is gradually reduced from the combustion chamber casing to the turbine casing so as to form an inclined section for connecting the combustion chamber casing and the turbine casing; the nozzle part comprises a nozzle mounting surface which is positioned between two adjacent arched bearing beams and is parallel to the head of the flame tube, the nozzle mounting surface can realize that the fuel nozzle is mounted in a straight insertion mode, and a connecting surface which is positioned at the bottom end of the nozzle mounting surface and is vertically arranged with the nozzle mounting surface is smoothly and transitionally connected with the connecting surface; the arched bearing beam, the nozzle mounting surface and the connecting surface are combined to form an inwards concave groove structure.
Furthermore, the nozzle mounting surface is provided with a nozzle mounting boss which is used for inserting the fuel nozzle into the head of the flame tube in a horizontal straight line mode, and the nozzle mounting boss is provided with a nozzle mounting hole which is used for inserting the fuel nozzle into the head of the flame tube by penetrating through the nozzle mounting boss and is used for mounting and fixing the fuel nozzle.
Furthermore, the connecting section between the arched bearing beam and the turbine casing is in smooth arc transition connection, and the radius R of the arc is larger than 10 mm.
Further, the axial distance between the combustion chamber casing and the turbine casing is L, and the radial height between the combustion chamber casing and the turbine casing is LThe fall is H, and the inclination angle a of the arched bearing beam is
The inclination angle a of the arched bearing beam is 20-60 degrees.
Furthermore, the maximum axial distance drop between the nozzle mounting surface and the arched bearing beam is D, which is determined by the inclination angle a of the arched bearing beam, the radial height drop H and the length K of the fuel nozzle,
the relation is as follows:
further, the width W1 of the arched bearing beam in the direction from the combustion chamber casing to the turbine casing is gradually increased, and the width W2 of the nozzle mounting surface in the direction from the combustion chamber casing to the turbine casing is gradually reduced; w1: W2 are 1: 0.25-5.
Furthermore, fillet smooth transition is adopted at the corner of the notch surface of the groove structure.
According to another aspect of the invention, the manufacturing method of the head structure of the casing of the reflow combustion chamber is further provided, the blank of the head structure of the casing of the reflow combustion chamber is processed and prepared by adopting a precision casting or three-dimensional rapid prototyping printing technology, the end face of the nozzle installation boss is processed by adopting a precision combination machining mode, and the head structure of the casing of the reflow combustion chamber is obtained to obtain the head structure of the casing of the reflow combustion chamber.
According to another aspect of the invention, an engine combustion chamber is also provided, and the engine combustion chamber comprises the backflow combustion chamber casing head structure.
The invention has the following beneficial effects:
the head structure of the casing of the reflow combustion chamber adopts an annular base body structure and comprises the arched bearing beams and the nozzle parts, wherein the arched bearing beams are positioned between the two adjacent nozzle parts, and in order to meet the uniform temperature distribution of the outlet of the combustion chamber, the arched bearing beams and the nozzle parts are alternately distributed along the circumferential direction of the annular base body structure, namely, the arched bearing beams and the nozzle parts are uniformly distributed along the circumferential direction, the requirement of installing a fuel nozzle is met, the load and the stress on the head structure of the casing of the reflow combustion chamber are uniformly dispersed along the circumferential direction as much as possible, and the stress concentration is avoided. When the engine works normally, various loads (such as aerodynamic force, maneuvering load and the like) are transmitted to the main mounting section of the engine through the casing of the reflow combustion chamber, the various loads are transmitted to the head structure of the casing of the reflow combustion chamber and mainly act on the arched bearing beam, and the arched bearing beam is used as the bearing beam and is transmitted to the front end and the rear end. In addition, the head structure of the casing of the backflow combustion chamber is also subjected to pressure generated by the difference between the internal pressure and the external pressure of the casing of the combustion chamber. Because bow-shaped bearing beam, nozzle installation face and connection face combination form inside sunken groove structure, similar to frame rack structure, frame rack structure's whole rigidity is showing and is superior to planar structure, can guarantee that the reflow combustion chamber machine casket head structure receives various loads, pressure effect time spent, does not take place to warp, guarantees all the time that the engine is changeed, the stator is concentric, avoids rotor scraping, vibration scheduling problem, guarantees the operation safety of engine.
The engine combustion chamber adopts the head structure of the casing of the backflow combustion chamber, and aims to solve the problems of stress concentration and insufficient rigidity of the head structure of the casing of the backflow combustion chamber on the premise of not increasing the weight of the casing and keeping the positioning accuracy and the maintainability of a nozzle, and improve the safety of the engine. The engine combustion chamber passes through the calculation and evaluation of strength, rigidity and service life, the calculation result shows that the head structure of the casing of the backflow combustion chamber does not have a stress concentration phenomenon, the strength reserve coefficient of the casing of the engine combustion chamber accords with relevant regulations, the deformation of the head structure of the casing of the backflow combustion chamber is small, the use requirements of the engine in various states are met, and the working cycle service life meets the design index requirements under the condition of a rated engine load spectrum.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. In the drawings:
FIG. 1 is a schematic view of a reverse flow combustor;
FIG. 2 is a schematic view of a head structure of a beveled combustion casing;
FIG. 3 is a schematic view of a stepped combustion chamber casing head configuration;
FIG. 4 is a block diagram of the head of the reverse flow combustor case of the preferred embodiment of the present invention;
FIG. 5 is a cross-sectional view A-A of the preferred embodiment of the present invention;
FIG. 6 is a cross-sectional view taken along line B-B of the preferred embodiment of the present invention
Fig. 7 is a cross-sectional view through C-C of the preferred embodiment of the present invention.
The reference numbers indicate:
1. an arched load-bearing beam; 2. a nozzle portion; 21. a nozzle mounting face; 211. mounting a boss on the nozzle; 212. a nozzle mounting hole; 213. a threaded hole; 22. a connecting surface;
100. a combustion chamber casing; 200. a turbine case; 300. a flame tube; 400. and a fuel nozzle.
I, II, III and IV respectively represent four notch corners of the groove structure; r represents the radius of a circular arc; l represents the axial distance between the combustor case and the turbine case; h is the radial height difference between the combustion chamber casing and the turbine casing; a represents the inclination angle of the arched bearing beam, D represents the maximum axial distance drop between the nozzle mounting surface and the arched bearing beam, K represents the length of the fuel nozzle, W1 represents the width of the arched bearing beam, and W2 represents the width of the nozzle mounting surface.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
FIG. 1 is a schematic view of a reverse flow combustor; FIG. 2 is a schematic view of a head structure of a beveled combustion casing; FIG. 3 is a schematic view of a stepped combustion chamber casing head configuration; FIG. 4 is a block diagram of the head of the reverse flow combustor case of the preferred embodiment of the present invention; FIG. 5 is a cross-sectional view A-A of the preferred embodiment of the present invention; FIG. 6 is a cross-sectional view B-B of the preferred embodiment of the present invention; fig. 7 is a cross-sectional view through C-C of the preferred embodiment of the present invention.
As shown in fig. 4, the reflow combustion chamber casing head structure of the present embodiment is located between the combustion chamber casing 100 and the turbine casing 200, and is used for wrapping the head of the flame tube 300, the reflow combustion chamber casing head structure adopts an annular base body structure, one end of the reflow combustion chamber casing head structure is connected with the combustion chamber casing 100, and the other end of the reflow combustion chamber casing head structure is connected with the turbine casing 200; the head structure of the casing of the reflow combustion chamber comprises an arched bearing beam 1 and a nozzle part 2 which are alternately arranged along the circumferential direction of the annular base body structure, and the arched bearing beam 1 and the nozzle part 2 are in smooth transition connection by adopting an arc surface; the arched bearing beam 1 adopts a base body structure with an arched cross section, and the radial dimension of the arched bearing beam 1 is gradually reduced from the combustion chamber casing 100 to the turbine casing 200 so as to form an inclined section for connecting the combustion chamber casing 100 and the turbine casing 200; the nozzle part 2 comprises a nozzle mounting surface 21 which is positioned between two adjacent arched bearing beams 1 and is parallel to the head of the flame tube 300, the nozzle mounting surface 21 can realize that the fuel nozzle 400 is mounted in a straight-inserting mode, a connecting surface 22 which is positioned at the bottom end of the nozzle mounting surface 21 and is vertically arranged with the nozzle mounting surface 21, and the nozzle mounting surface 21 is smoothly and transitionally connected with the connecting surface 22; the arched force bearing beam 1, the nozzle mounting surface 21 and the connecting surface 22 are combined to form an inwards concave groove structure.
The head structure of the casing of the reflow combustion chamber adopts an annular base body structure and comprises an arched bearing beam 1 and nozzle parts 2, wherein the arched bearing beam 1 is positioned between the two adjacent nozzle parts 2, in order to meet the uniform temperature distribution of the outlet of the combustion chamber, the arched bearing beam 1 and the nozzle parts 2 are alternately distributed along the circumferential direction of the annular base body structure, namely, the mode of circumferential uniform distribution is realized, the requirement of installing a fuel nozzle 400 is met, and the load and the stress borne by the head structure of the casing of the reflow combustion chamber are uniformly dispersed along the circumferential direction as much as possible, so that the stress concentration is avoided. When the engine works normally, various loads (such as aerodynamic force, maneuvering load and the like) are transmitted to the main mounting section of the engine through the reflow combustion chamber casing, the various loads are transmitted to the head structure of the reflow combustion chamber casing and mainly act on the arched bearing beam 1, and the arched bearing beam 1 is used as the bearing beam to be transmitted to the front end and the rear end. In addition, the combustor casing head structure is also subjected to the pressure created by the difference between the internal and external pressures of the combustor casing 100. Because the arched bearing beam 1, the nozzle mounting surface 21 and the connecting surface 22 are combined to form an inwards-concave groove structure, the structure is similar to a frame structure, the overall rigidity of the frame structure is obviously superior to that of a plane structure, the head structure of the casing of the backflow combustion chamber can be guaranteed not to deform under the action of various loads and pressure, the rotation and the stator concentricity of the engine can be guaranteed all the time, the problems of rotor scraping, vibration and the like are avoided, and the operation safety of the engine is guaranteed.
As shown in fig. 2, if the gently-transitional inclined-plane type combustor casing head structure is adopted, at the part where the radial dimension of the head of the liner 300 changes sharply, the diameter of the combustor casing 100 transits gently, and the purpose of connecting with the turbine casing 200 is achieved by slowly contracting the diameter of the casing, that is, only the inclined section of the arched bearing beam 1 is adopted, and the nozzle mounting seat is arranged on the inclined section. The head structure of the combustion chamber casing can avoid the problem of stress concentration caused by sudden change of the diameter of the casing to a certain degree, but after the head of the combustion chamber casing is changed into an inclined plane, the head of the casing is not parallel to the head of the flame tube 300, the fuel nozzle 400 can meet the installation requirement of the nozzle only by adopting an inclined insertion mode, the nozzle rod of the fuel nozzle 400 is longer by adopting the inclined insertion mode, the positioning precision is lower than that of a direct insertion mode, and the installation of the fuel nozzle 400 is more complicated than that of the direct insertion mode, so that the maintainability of an engine is influenced. Moreover, within the same axial length, the head structure of the inclined-plane type combustion chamber casing has a larger average diameter, and an inclined-insertion type nozzle with a larger volume needs to be matched with the inclined-plane type combustion chamber casing, so that the weight of the engine can be increased.
As shown in fig. 3, if a stepped combustor casing head structure is adopted, the combustor casing 100 forms a stepped drop at the head position of the liner 300, the combustor casing 100 rapidly shrinks in diameter and is connected with the turbine casing 200, and the fuel nozzle 400 can be installed in an in-line manner. However, the diameter of the head structure of the stepped combustion chamber casing is changed violently, which is easy to cause stress concentration at the corner part of the severe change of the casing profile, and a high stress area is generated, and the high stress area is in a high stress working condition for a long time, and the high stress part will slowly generate plastic deformation, thereby affecting the centering function of the casing, causing the rotor and the stator to be non-concentric to generate vibration or scraping, and affecting the safety of the engine.
Therefore, the head structure of the casing of the reflow combustion chamber integrates the advantages of the head structure of the inclined-plane type casing and the head structure of the stepped type casing, adopts the structure of the arched bearing beam 1 in the form of the inclined plane and the nozzle mounting surface 21 parallel to the head of the flame tube 300, namely the nozzle mounting surface 21 is kept vertical to the center line of the swirler of the flame tube 300, thereby ensuring that the engine load can be uniformly transited at the head of the casing of the combustion chamber without causing stress concentration; on the other hand, the fuel nozzle 400 is convenient to be installed in a direct insertion mode, the nozzle is convenient to disassemble and assemble, and the positioning accuracy and the assembling and disassembling maintainability of the nozzle are guaranteed. Moreover, on the premise of not increasing the weight of the combustion chamber casing 100, the frame structure with the arch-shaped bearing beam 1 and the nozzle part 2 arranged in a staggered mode is adopted, so that the integral rigidity of the head part of the combustion chamber casing can be improved, and the head part of the casing is prevented from deforming.
As shown in fig. 4, in the present embodiment, the nozzle mounting surface 21 is provided with a nozzle mounting boss 211 for inserting the fuel nozzle 400 into the head of the combustor basket 300 in a horizontal linear manner, the nozzle mounting boss 211 is provided with a nozzle mounting hole 212 for inserting the fuel nozzle 400 into the head of the combustor basket 300 through the nozzle mounting boss 211, and a screw hole 213 for mounting and fixing the fuel nozzle 400.
In this embodiment, the nozzle mounting surface 21 is provided with a nozzle mounting boss 211 for inserting the fuel nozzle 400 into the head of the combustor basket 300 in a horizontal linear manner, and the nozzle mounting boss 211 is provided with a nozzle mounting hole 212 for inserting the fuel nozzle 400 into the head of the combustor basket 300 by penetrating the nozzle mounting boss 211 and a threaded hole 213 for mounting and fixing the fuel nozzle 400. The nozzle mounting surface 21 is provided with a nozzle mounting boss 211 which comprises a nozzle mounting hole 212 and a threaded hole 213, the requirement on the plane precision of the boss is high, mainly the requirement on the mounting, positioning and sealing of the nozzle, and the boss can be machined and molded in a combined machining mode. The combined machining mode is that the plane with high precision requirement is machined in the assembly separately so as to ensure the requirements of plane position degree, roughness and the like.
In the embodiment, as shown in fig. 4 and 5, the connecting section between the arched force-bearing beam 1 and the turbine casing 200 adopts a smooth circular arc transition connection. The connecting section between the arched bearing beam 1 and the turbine casing 200 adopts smooth circular arc transition, and the larger the radius R value of the circular arc is, the flatter the transition between the arched bearing beam 1 and the turbine casing 200 is, and the lower the stress level of the circular arc part is. Preferably. The radius R of the circular arc is larger than 10 mm.
As shown in fig. 4 and 5, in the present embodiment, the axial distance between the combustor casing 100 and the turbine casing 200 is L, the radial height drop between the combustor casing 100 and the turbine casing 200 is H, and the inclination angle a of the arched force-bearing beam is H
The inclination angle a of the arched bearing beam is 20-60 degrees. The arched bearing beam 1 is of an inclined structure, and the mode has the advantage of an inclined-plane type casing head structure, so that stress concentration at the corners of the casing head can be effectively avoided. The smaller the inclination angle a of the arched force-bearing beam 1 is, the more beneficial the stress concentration phenomenon of the corner of the casing head is reduced, and the inclination angle a is determined by the axial distance L and the radial height difference H between the combustor casing 100 and the turbine casing 200.
As shown in fig. 5 and 6, in the present embodiment, the maximum axial distance drop D between the nozzle mounting surface 21 and the arched load-bearing beam 1 is determined by the inclination angle a of the arched load-bearing beam, the radial height drop H and the length K of the fuel nozzle,
the relation is as follows:
as shown in fig. 7, in the present embodiment, the width W1 of the arched force-bearing beam 1 in the direction from the combustor casing 100 to the turbine casing 200 gradually increases, and the width W2 of the nozzle mounting surface 21 in the direction from the combustor casing 100 to the turbine casing 200 gradually decreases; w1 to W2 are 1 to 0.25-5. The width W1 of the arched messenger beam 1 is in relation to the width W2 of the nozzle mounting face 21. The width W1 of the arched bearing beam 1 is related to the width W2 of the nozzle mounting surface 21, the width W2 of the nozzle mounting surface 21 must be capable of ensuring the assembly performance of the fuel nozzle 400, and on the premise that the fuel nozzle 400 can be freely assembled and disassembled, the width W2 of the nozzle mounting surface 21 is reduced as much as possible, so that the width W1 of the arched bearing beam 1 is as large as possible, the force transmission area is increased, and the stress peak value is favorably reduced.
In the present embodiment, as shown in fig. 4, the corners of the notch surfaces of the groove structure are smoothly rounded. The load borne by the engine is mainly transmitted through the inclined plane type arched bearing beam 1 of the head structure of the casing of the backflow combustion chamber, and the stress can be smoothly transited when being transmitted along the wall surface of the casing by the inclined plane type structure, so that the stress concentration is avoided. In order to ensure that the load borne by the arched force-bearing beam 1 can be uniformly dispersed along the periphery, four notch corners (I, II, III and IV respectively) of a groove structure formed by connecting and combining the arched force-bearing beam 1, the nozzle mounting surface 21 and the connecting surface 22 must adopt a fillet smooth transition mode, and the load on the four corners of the arched force-bearing beam 1 can be released gently along the peripheral parts through the smooth transition of an arc surface.
According to another aspect of the present invention, a method for manufacturing a head structure of a casing of a reflow combustion chamber is further provided, wherein a precision casting or three-dimensional rapid prototyping printing technology is adopted to process and prepare a blank of the head structure of the casing of the reflow combustion chamber, and a precision combination machining method is adopted to process the end surface of the nozzle mounting boss 211, so as to obtain the head structure of the casing of the reflow combustion chamber. According to the manufacturing method of the head structure of the casing of the reflow combustion chamber, the blank of the head structure of the casing of the reflow combustion chamber can be manufactured by firstly adopting a precision casting or three-dimensional rapid prototyping printing technology, and then the end face of the nozzle mounting boss 211 is processed by adopting a combined machining mode, so that the manufacturing of the head structure of the casing of the reflow combustion chamber is completed, a large amount of machining time can be saved, the forming efficiency of the casing is improved, and the economy and the efficiency of the casting mode are more obvious in large-scale batch production.
According to another aspect of the invention, an engine combustion chamber is also provided, and the engine combustion chamber comprises the backflow combustion chamber casing head structure. The engine combustion chamber adopts the head structure of the casing of the backflow combustion chamber, and aims to solve the problems of stress concentration and insufficient rigidity of the head structure of the casing of the backflow combustion chamber on the premise of not increasing the weight of the casing and keeping the positioning accuracy and the maintainability of a nozzle, and improve the safety of the engine. The engine combustion chamber passes through the calculation and evaluation of strength, rigidity and service life, the calculation result shows that the head structure of the casing of the backflow combustion chamber does not have a stress concentration phenomenon, the strength reserve coefficient of the casing of the engine combustion chamber accords with relevant regulations, the deformation of the head structure of the casing of the backflow combustion chamber is small, the use requirements of the engine in various states are met, and the working cycle service life meets the design index requirements under the condition of a rated engine load spectrum.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A head structure of a reflow combustion chamber casing, which is arranged between a combustion chamber casing (100) and a turbine casing (200) and is used for wrapping the head of a flame tube (300), is characterized in that,
the head structure of the backflow combustion chamber casing adopts an annular base body structure, one end of the head structure of the backflow combustion chamber casing is connected with the combustion chamber casing (100), and the other end of the head structure of the backflow combustion chamber casing is connected with the turbine casing (200);
the head structure of the casing of the reflow combustion chamber comprises bow-shaped bearing beams (1) and nozzle parts (2) which are alternately arranged along the circumferential direction of the annular base body structure, wherein the bow-shaped bearing beams (1) are in smooth transition connection with the nozzle parts (2) by adopting arc surfaces;
the cross section of the arched bearing beam (1) is of an arched base body structure, and the radial dimension of the arched bearing beam (1) is gradually reduced from the combustion chamber casing (100) to the turbine casing (200) so as to form an inclined section for connecting the combustion chamber casing (100) and the turbine casing (200);
the nozzle part (2) comprises a nozzle mounting surface (21) which is positioned between two adjacent arched bearing beams (1) and is parallel to the head of the flame tube (300), the nozzle mounting surface (21) can realize that a fuel nozzle (400) is mounted in a straight-inserting mode, a connecting surface (22) which is positioned at the bottom end of the nozzle mounting surface (21) and is vertically arranged with the nozzle mounting surface (21) is arranged, and the nozzle mounting surface (21) is in smooth transition connection with the connecting surface (22);
the arched bearing beam (1), the nozzle mounting surface (21) and the connecting surface (22) are combined to form an inwards-concave groove structure.
2. The reflow combustion chamber casing head structure of claim 1,
the nozzle mounting surface (21) is provided with a nozzle mounting boss (211) for inserting the fuel nozzle (400) into the head of the flame tube (300) in a horizontal linear mode, and the nozzle mounting boss (211) is provided with a nozzle mounting hole (212) for inserting the fuel nozzle (400) into the nozzle mounting boss (211) to be inserted into the head of the flame tube (300) in a penetrating mode and a threaded hole (213) for mounting and fixing the fuel nozzle (400).
3. The casing head structure of a reflow combustion chamber in accordance with claim 1,
the connecting section between the arched bearing beam (1) and the turbine casing (200) adopts smooth circular arc transition connection, and the radius R of the circular arc is larger than 10 mm.
4. The reflow combustion chamber casing head structure of claim 1,
the axial distance between the combustion chamber casing (100) and the turbine casing (200) is L, the radial height drop between the combustion chamber casing (100) and the turbine casing (200) is H, and the inclination angle a of the arched bearing beam (1) is L
The inclination angle a of the arched bearing beam (1) is 20-60 degrees.
5. The reflow combustion chamber casing head structure of claim 4,
the maximum axial distance drop between the nozzle mounting surface (21) and the arched bearing beam (1) is D, which is determined by the inclination angle a of the arched bearing beam (1), the radial height drop H and the length K of the fuel nozzle,
the relation is as follows:
6. the reflow combustion chamber casing head structure of claim 1,
the width W1 of the arched force-bearing beam (1) in the direction from the combustion chamber casing (100) to the turbine casing (200) is gradually increased, and the width W2 of the nozzle mounting surface (21) in the direction from the combustion chamber casing (100) to the turbine casing (200) is gradually reduced;
w1: W2 are 1: 0.25-5.
7. The casing head structure of a reflow combustion chamber in accordance with claim 1,
and the corners of the notch surfaces of the groove structures are in round-angle smooth transition.
8. A method of manufacturing a casing head structure for a reflow combustion chamber according to any one of claims 1 to 7,
processing and preparing a blank of the head structure of the casing of the reflow combustion chamber by adopting a precision casting or three-dimensional rapid prototyping printing technology; and (3) processing the end surface of the nozzle mounting boss (211) by adopting a precision combination machining mode to obtain the head structure of the casing of the reflux combustion chamber.
9. An engine combustion chamber comprising the reflow combustion chamber casing head structure of any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110405510.7A CN113154456B (en) | 2021-04-15 | 2021-04-15 | Head structure of casing of backflow combustion chamber, manufacturing method of head structure and engine combustion chamber |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110405510.7A CN113154456B (en) | 2021-04-15 | 2021-04-15 | Head structure of casing of backflow combustion chamber, manufacturing method of head structure and engine combustion chamber |
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| Publication Number | Publication Date |
|---|---|
| CN113154456A CN113154456A (en) | 2021-07-23 |
| CN113154456B true CN113154456B (en) | 2022-06-21 |
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| CN202110405510.7A Active CN113154456B (en) | 2021-04-15 | 2021-04-15 | Head structure of casing of backflow combustion chamber, manufacturing method of head structure and engine combustion chamber |
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| CN115288804B (en) * | 2022-10-10 | 2023-03-24 | 中国航发四川燃气涡轮研究院 | Bird skeleton bionic force-bearing structure and design method thereof |
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| FR943932A (en) * | 1946-03-25 | 1949-03-22 | Rolls Royce | Improvements to internal combustion turbines |
| GB1347697A (en) * | 1970-04-18 | 1974-02-27 | Mtu Muenchen Gmbh | Gas turbine engine combustion chamber |
| CN1573075A (en) * | 2003-05-29 | 2005-02-02 | 通用电气公司 | Multiport dome baffle |
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| CN101818910A (en) * | 2010-03-24 | 2010-09-01 | 北京航空航天大学 | Miniature gas turbine combustion chamber |
| CN106471312A (en) * | 2014-06-24 | 2017-03-01 | 赛峰直升机发动机公司 | The assembly for turbine engine combustion chamber including boss and ring-type element |
| CN111503660A (en) * | 2020-04-29 | 2020-08-07 | 中国航发湖南动力机械研究所 | Exhaust elbow and return flow combustion chamber |
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| GB617977A (en) * | 1945-04-04 | 1949-02-15 | Lysholm Alf | Improvements in gas turbine power plants |
| FR943932A (en) * | 1946-03-25 | 1949-03-22 | Rolls Royce | Improvements to internal combustion turbines |
| GB1347697A (en) * | 1970-04-18 | 1974-02-27 | Mtu Muenchen Gmbh | Gas turbine engine combustion chamber |
| CN1573075A (en) * | 2003-05-29 | 2005-02-02 | 通用电气公司 | Multiport dome baffle |
| CN101324344A (en) * | 2007-06-14 | 2008-12-17 | 斯奈克玛 | Turbomachine combustion chamber with helical air circulation |
| CN101818910A (en) * | 2010-03-24 | 2010-09-01 | 北京航空航天大学 | Miniature gas turbine combustion chamber |
| CN106471312A (en) * | 2014-06-24 | 2017-03-01 | 赛峰直升机发动机公司 | The assembly for turbine engine combustion chamber including boss and ring-type element |
| CN111503660A (en) * | 2020-04-29 | 2020-08-07 | 中国航发湖南动力机械研究所 | Exhaust elbow and return flow combustion chamber |
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| CN113154456A (en) | 2021-07-23 |
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