CN114151826A - Variable geometry combustion chamber - Google Patents
Variable geometry combustion chamber Download PDFInfo
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- CN114151826A CN114151826A CN202111222222.4A CN202111222222A CN114151826A CN 114151826 A CN114151826 A CN 114151826A CN 202111222222 A CN202111222222 A CN 202111222222A CN 114151826 A CN114151826 A CN 114151826A
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- combustion chamber
- swirler
- sleeve
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 82
- 230000005540 biological transmission Effects 0.000 claims abstract description 56
- 230000007246 mechanism Effects 0.000 claims abstract description 41
- 239000000446 fuel Substances 0.000 claims description 3
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 230000000712 assembly Effects 0.000 claims 1
- 238000000429 assembly Methods 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 8
- 230000008569 process Effects 0.000 abstract description 5
- 238000004378 air conditioning Methods 0.000 abstract 1
- 238000006073 displacement reaction Methods 0.000 description 6
- QNRATNLHPGXHMA-XZHTYLCXSA-N (r)-(6-ethoxyquinolin-4-yl)-[(2s,4s,5r)-5-ethyl-1-azabicyclo[2.2.2]octan-2-yl]methanol;hydrochloride Chemical compound Cl.C([C@H]([C@H](C1)CC)C2)CN1[C@@H]2[C@H](O)C1=CC=NC2=CC=C(OCC)C=C21 QNRATNLHPGXHMA-XZHTYLCXSA-N 0.000 description 4
- 230000003247 decreasing effect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000002337 anti-port Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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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
- F23R3/04—Air inlet arrangements
- F23R3/10—Air inlet arrangements for primary air
- F23R3/12—Air inlet arrangements for primary air inducing a vortex
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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
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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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Combustion (AREA)
Abstract
The invention discloses a variable-geometry combustion chamber, belongs to the technical field of main combustion chamber air-conditioning distribution equipment, and solves the technical problems that the contradiction between low-working-condition stability and high-working-condition efficient combustion of a high-temperature-rise combustion chamber and a low-pollution combustion chamber does not influence the air entraining of turbine parts. The swirler is used for conveying the air discharged by the air compressor into the flame tube (3) in a swirling manner and stably combusting, an air inlet is arranged at a preset position on the tube body of the flame tube (3), and the swirler comprises a driving mechanism (5) arranged on the outer surface of the casing (1) and a connecting rod transmission mechanism arranged on the casing (1), wherein: the driving mechanism (5) can do linear reciprocating motion to drive the connecting rod transmission mechanism to simultaneously shield the air inlet area of the swirler and the area of the air inlet hole in the flame tube (3) according to the preset area, so that the air flow distribution in the combustion chamber can be adjusted. The device is used for ensuring that the total effective opening area of the combustion chamber is kept unchanged in the adjusting process.
Description
Technical Field
The invention belongs to the technical field of air quantity adjusting equipment of a main combustion chamber, and particularly relates to a variable-geometry combustion chamber.
Background
The contradiction between low-working-condition stable combustion and high-working-condition efficient smokeless combustion of a high-temperature-rise combustion chamber and a low-emission combustion chamber is prominent, the existing traditional combustion chamber mainly adopts a hierarchical and partitioned tissue combustion technology, such as tissue combustion technologies of rich oil, quick quenching, lean oil premixing and pre-evaporation, multi-point injection and the like, to balance the contradiction between low-working-condition stability and high-working-condition efficient low-pollution combustion, but the balance is just like a 'seesaw', the performance of one aspect is inevitably sacrificed, and the traditional tissue combustion technology cannot be balanced with the further improvement of the oil-gas ratio of an aeroengine.
In order to improve the performance of aircraft engines and gas turbines or to broaden the operating stability margin, the concept of "variable geometry" has been widely applied to components such as air inlets, compressors, turbines and tail pipes. The variable geometry combustion chamber aims to adjust the opening areas of different parts of the combustion chamber under different working conditions in a certain mode, so that the flow distribution is changed, the equivalent ratio of a main combustion zone of the combustion chamber is always kept in a proper range, and the combustion chamber can keep low working condition stability and high working condition high-efficiency smokeless combustion in a wide oil-gas ratio working range. The variable geometry combustion chamber mainly has two forms of variable head part open area and variable flame tube open area.
Patent application number C201911084676.2 has mentioned a whirl angle adjustable becomes radial swirler of geometry, through set up the bottom shaft on radial swirler annular wall and set up the shaft hole on the whirl blade, the axle inserts the shaft hole and forms rotatory cooperation for the blade can be around the rotation of axle, there is the orbit axle at every blade top, with the orbit groove cooperation of driving disc, drives all blades at the orbit inslot through the driving disc and moves, thereby realizes the adjustment of head trompil area. The method has the advantages that the variable geometric structure is complex, the processing requirement on the radial swirler is high, the influence on the swirl number is large by changing the angle of the blades of the radial swirler, the tissue combustion is not facilitated, and meanwhile, the total opening area of a combustion chamber is greatly changed, so that the influence on the air entrainment of a turbine is brought.
Patent US7500347B2 mentions a variable geometry combustor, the opening and closing of the mixing hole is controlled by a radially movable valve, the air inflow of the head is controlled by an axially movable cone, the opening area of the mixing hole is only in two modes of opening and closing, the sudden change of the opening area easily causes unstable combustion, and the head and the mixing hole are controlled respectively, and an independent driving mechanism is required for driving, thereby having adverse effects on the complexity, the weight, the cost and the like of the structure.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The invention aims to provide a variable-geometry combustion chamber, which solves the contradiction between low-working-condition stability and high-working-condition efficient combustion of a high-temperature-rise combustion chamber and a low-pollution combustion chamber, and realizes the technical problems of synchronous stepless continuous adjustment of the opening areas of a head part and a flame tube, constant total opening area of the combustion chamber and no influence on turbine parts. The technical scheme of the scheme has a plurality of technical beneficial effects, which are described as follows:
the variable-geometry combustion chamber comprises a flame tube, a casing, a fuel system and a head swirler, wherein the swirler is used for conveying air discharged by a gas compressor into the flame tube in a swirling mode and stabilizing combustion, an air inlet hole is arranged at a preset position on a barrel body of the flame tube, and the variable-geometry combustion chamber comprises a driving mechanism arranged on the outer surface of the casing and a connecting rod transmission mechanism arranged on the casing, wherein:
the driving mechanism can do linear reciprocating motion to drive the connecting rod transmission mechanism to simultaneously shield the air inlet area of the swirler and the area of the air inlet hole in the flame tube according to the preset area, and the air flow distribution in the combustion chamber can be adjusted.
Furthermore, the connecting rod transmission mechanism can adjust the air flow distribution in the combustion chamber, so that the increased or decreased air inflow of the swirler is consistent or identical with the decreased or increased air inflow of the air inlet of the flame tube, and the shielded effective area is ensured to be identical or equivalent, namely the flow coefficient is the physical area.
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
the drive mechanism of this case can be straight reciprocating motion to drive connecting rod drive mechanism shelters from the area of admitting air of swirler and the area of going up the air pocket of flame according to the predetermined area simultaneously, can adjust the air mass flow distribution in the combustion chamber. Compared with the traditional low-pollution combustion chamber and high-temperature-rise combustion chamber, the low-pollution combustion chamber and the high-temperature-rise combustion chamber fundamentally solve the contradiction between the low-working-condition stability and the high-working-condition efficient combustion of the low-pollution combustion chamber and the high-temperature-rise combustion chamber, greatly widen the stable working envelope of the combustion chamber and reduce the pollutant emission of the combustion chamber. The adjustable nozzle has the advantages that the structure is simple, the adjustable range of the variable area of the combustion chamber is large, the areas of the head swirler and the flame tube are synchronously changed in the process of adjusting the opening area of the combustion chamber, and the total effective opening area of the combustion chamber can be kept unchanged in the adjusting process without influencing turbine parts by matching parameters such as the length of the connecting rod, the initial angle and the like.
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 description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of a variable geometry combustor;
FIG. 2 is a schematic view of a drive linkage;
FIG. 3 is a schematic view of an actuator linkage;
FIG. 4 is a schematic view of a link ring and swirler sleeve;
FIG. 5 is a schematic view of a second sleeve;
FIG. 6 is a schematic view of a rotary crank A;
FIG. 7 is a schematic view of a rotary crank connection;
FIG. 8 is a schematic view of a variable geometry adjustment principle;
wherein, 1, a casing; 2. a combustion chamber head; 3. a flame tube; 24. a radial swirler; 4. a main burning hole; 5. a drive mechanism; 12a, a first rod; 12b, a second rod; 13a, a third rod; 13b, a fourth rod; 16. a fifth lever; 18. a first sleeve; 21. a sixth rod; 22. a second sleeve.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that various aspects of the embodiments are described below within the scope of the appended claims. It should be apparent that the aspects described herein may be embodied in a wide variety of forms and that any specific structure and/or function described herein is merely illustrative. Based on the disclosure, one skilled in the art should appreciate that one aspect described herein may be implemented independently of any other aspects and that two or more of these aspects may be combined in various ways. For example, an apparatus may be implemented and/or a method practiced using any number of the aspects set forth herein. Additionally, such an apparatus may be implemented and/or such a method may be practiced using other structure and/or functionality in addition to one or more of the aspects set forth herein.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the drawings only show the components related to the present invention rather than the number, shape and size of the components in practical implementation, and the type, quantity and proportion of the components in practical implementation can be changed freely, and the layout of the components can be more complicated.
In addition, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that aspects may be practiced without these specific details. In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments. The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
The variable geometry combustion chamber as shown in fig. 1 comprises a flame tube 3, a casing 1, a fuel system and a head swirler, wherein the swirler is used for delivering air discharged by a compressor into the flame tube 3 in a swirling manner and stabilizing combustion, an air inlet is arranged at a preset position on a barrel body of the flame tube 3, and the variable geometry combustion chamber further comprises a driving mechanism 5 arranged on the outer surface of the casing 1 and a connecting rod transmission mechanism arranged on the casing 1, wherein:
the driving mechanism 5 can do linear reciprocating motion to drive the connecting rod transmission mechanism to simultaneously shield the air inlet area of the swirler and the area of the air inlet hole on the flame tube 3 according to the preset area, so that the air flow distribution in the combustion chamber can be adjusted. Specifically, the link transmission mechanism can adjust the air flow distribution in the combustion chamber, so that the air inflow increased or decreased by the swirler is consistent with or equal to the air inflow decreased or increased by the air inlet of the flame tube 3, that is, the effective area of the shielding is ensured to be the same or equivalent, and the effective area is the flow coefficient physical area.
As a specific embodiment provided by the present disclosure, the driving mechanism 5 is a hydraulic cylinder, the hydraulic cylinder includes a driving connecting rod that moves in a linear reciprocating manner, and the driving connecting rod can push the connecting rod transmission mechanism to move, so as to simultaneously shield the air inlet on the swirler and the air inlet on the circumferential surface of the flame tube 3. For example, the swirler is circumferentially provided with an air inlet channel or an air inlet, the flame tube 3 is circumferentially provided with an air inlet, the connecting rod transmission mechanism comprises a first sleeve 18 and a second sleeve 22, wherein: the first sleeve 18 can block the air inlet passage or port of the swirler and the second sleeve 22 can block the air inlet ports on the liner 3.
As a specific embodiment provided by the present disclosure, the link transmission mechanism further includes an outer cylinder, an inner cylinder, a mounting seat, and a first link assembly and a second link assembly, and the mounting manner is as follows:
first link assembly is connected with urceolus and inner tube one end respectively, and the drive connecting rod promotes first link assembly and actuates to drive urceolus and inner tube antiport, specific:
the first connecting rod component comprises a transmission connecting rod a (7), a transmission connecting rod B (8), a rotating crank A (9), a rotating crank B (10), the inner cylinder and the outer cylinder are staggered in the vertical direction (close to the top end position) to install one end of the rotating crank A (9) and one end of the rotating crank B (10), the other ends of the rotating crank A (9) and the rotating crank B (10) correspond to one end of the hinged transmission connecting rod a (7) and one end of the transmission connecting rod B (8) through cranks, the other ends of the transmission connecting rod a (7) and the transmission connecting rod B (8) are connected with one end of a driving connecting rod, and the other end of the driving connecting rod is connected with the driving mechanism 5. The outer cylinder and the inner cylinder are rotatably connected through a bearing, the outer cylinder is rotatably connected with the casing 1 through a bearing, the bottom ends of the outer cylinder and the inner cylinder extend out of an area between the casing 1 and the flame tube 3, for example, the outer cylinder and the inner cylinder are rotatably connected in a manner that breaking teeth are meshed, the mounting seat is fixed on the outer surface of the casing 1, and the outer cylinder and the inner cylinder are rotatably mounted on the mounting seat. Under the action of the driving connecting rod, the driving connecting rod a (7), the driving connecting rod B (8), the rotating crank A (9) and the rotating crank B (10) are used for driving the outer cylinder and the inner cylinder to rotate reversely.
The other ends (bottom ends) of the outer cylinder and the inner cylinder are respectively connected with a second connecting rod assembly, the two ends of the second connecting rod assembly are respectively connected with a first sleeve 18 and a second sleeve 22, and the outer cylinder and the inner cylinder are driven by the driving connecting rod to rotate reversely and then respectively push the first sleeve 18 and the second sleeve 22 to move reversely along the axial direction.
After driving urceolus and inner tube antiport, will rotate through second link assembly and convert linear motion into to promote first sleeve 18 and second barrel and shelter from the inlet port on swirler and the flame tube 3 respectively, it is specific:
the second linkage assembly comprises a first rod 12a, a second rod 12b, a third rod 13a, a fourth rod 13b, a first driven link comprising a drive link 14 and a drive link 15, a second driven link comprising a drive link 19 and a drive link 20, wherein:
the first rod 12a and the second rod 12b are fixedly connected with the inner cylinder at a preset angle, and the third rod 13a and the fourth rod 13b are fixedly connected with the outer cylinder at a preset angle, or the first rod 12a and the second rod 12b are fixedly connected with the inner cylinder in an integrated manner, and the third rod 13a and the fourth rod 13b are fixedly connected with the outer cylinder in an integrated manner;
the first driven connecting rod is symmetrically hinged with the first rod 12a and the third rod 13a, one end of the first driven connecting rod is connected with the fifth rod 16, and the fifth rod 16 pushes the first sleeve 18 to move so as to partially or completely shield an air inlet channel or an air inlet of the cyclone;
the second driven connecting rod is symmetrically hinged with the second rod 12b and the fourth rod 13b, one end of the second driven connecting rod is connected with the sixth rod 21, and the second sleeve 22 is pushed to move by the sixth rod 21 so as to partially or completely shield the air inlet at the preset position on the flame tube 3;
the driving connecting rod respectively shields the part or all of the air inlets on the swirler and the flame tube 3 by driving the first sleeve 18 and the second sleeve 22, so that the variable geometric adjustment of the opening area of the combustion chamber is realized, and the adjustment and distribution of the air flow are realized.
As an embodiment provided herein, the fifth rod 16 is connected to the first sleeve 18 by a linkage ring.
The first rod 12a and the third rod 13a are at the same angle and length with the axial direction. The second rod 12b and the fourth rod 13b have the same length and the same axial angle. That is, the pushing displacement of the fifth lever 16 and the sixth lever 21 is adjusted by the difference in the rotation amount, thereby adjusting the shielding area.
Further, the length of the first rod 12a may be the same or different from the length of the second rod 12b to ensure that the effective area of the shrouding swirler or flame tube 3 is the same.
Examples, see FIGS. 1-8
Mainly comprises a combustion chamber body and a variable geometry adjusting mechanism. The combustion chamber body comprises a casing 1, a combustion chamber head 2, a flame tube 3, main combustion holes 4, a radial swirler 24 and the like, wherein the outermost primary swirler of the combustion chamber body head is the radial swirler, and the outer ring main combustion holes of the flame tube are in a rectangular structure plus two semicircular structures or similar structures. The variable geometry adjusting mechanism mainly comprises a driving mechanism and an executing mechanism, and the variable geometry adjusting mechanism comprises 2 groups which are symmetrically arranged.
Further, the driving mechanism is composed of a cylinder 5, a driving connecting rod 6, a transmission connecting rod a7, a transmission connecting rod B8, a rotating crank A9, a rotating crank B10 and the like. The actuating cylinder 5 is fixedly connected with the casing through a mounting seat. The drive link a7, the drive link B8, and the links of the rotary crank a9 and the rotary crank B10 form a diamond-shaped drive linkage, as shown in fig. 2. One end of a transmission connecting rod a7 and one end of a transmission connecting rod B8 are connected with the driving connecting rod 6 through pins at a point a, the transmission connecting rod a7 and the transmission connecting rod B8 can coaxially rotate around the pins, meanwhile, a connecting point a can linearly move along a diamond diagonal line ac, the other end of the transmission connecting rod a7 is connected with a connecting rod of a rotating crank A9 through pins at a point B, the transmission connecting rod a7 and the transmission connecting rod B8 can rotate around the pins, the other end of the transmission connecting rod B8 is connected with a connecting rod of a rotating crank B10 through pins at a point d, the transmission connecting rod a9 and the rotating crank B10 are coaxially assembled together at a point c and can rotate around the axes, and a wear-resistant high-temperature self-lubricating bushing 23 is arranged between the transmission connecting rod a7 and the rotation crank B10.
Further, the actuator is composed of an inner cylinder 12, an outer cylinder 13, a transmission connecting rod c14, a transmission connecting rod d15, a radial swirler transmission rod 16, a linkage ring 17, a first sleeve 18, a transmission connecting rod e19, a transmission connecting rod f20, a flame tube transmission rod 21, a second sleeve 22 and the like, as shown in fig. 3. The inner cylinder 12 and the outer cylinder 13 are coaxially sleeved together, and a high-temperature self-lubricating wear-resistant bush 23 is arranged between the two. The rotary cranks are provided with bosses similar to tooth openings, as shown in fig. 6, wherein the inner cylinder 12 and the rotary crank A9 are in matched connection through the bosses and rotate synchronously, and the outer cylinder 13 and the rotary crank B10 are in matched connection through the bosses and rotate synchronously. The rotary crank a9 and the inner cylinder 12, and the rotary crank B10 and the outer cylinder 13 are coaxially assembled, and then fixed to the casing by the mounting base 11, as shown in fig. 7.
Further, the inner cylinder connecting rod a12-a, the outer cylinder connecting rod a13-a, the transmission connecting rod c14 and the transmission connecting rod d15 form a rhombic cyclone execution connecting rod mechanism efgh, wherein the inner cylinder connecting rod a12-a is connected with the transmission connecting rod c14 through a pin at a point f, the outer cylinder connecting rod a13-a is connected with the transmission connecting rod d15 through a pin at a point h, and the transmission connecting rod c14, the transmission connecting rod d15 are connected with the radial cyclone transmission rod 16 through a pin at a point g. The swirler drive rod 16 is bolted to the link ring 17. The linkage ring is provided with an installation groove, and the connecting rod of the first sleeve 18 is inserted into the installation groove and connected through a self-locking nut.
Further, an inner cylinder connecting rod b12-b, an outer cylinder connecting rod b13-b, a transmission connecting rod e19 and a transmission connecting rod f20 form a rhombic flame tube execution connecting rod mechanism eijk, wherein the inner cylinder connecting rod b12-b is connected with the transmission connecting rod f20 through a pin at a point i, the outer cylinder connecting rod b13-b is connected with the transmission connecting rod e19 through a pin at a point k, and the transmission connecting rod e19, the transmission connecting rod f20 and the flame tube transmission rod 21 are connected through a pin at a point j. The flame tube drive rod 21 is welded to the second sleeve 22.
Further, the adjustment principle when the combustion chamber is adjusted in a variable geometry is shown in fig. 8. When the cylinder 5 moves linearly so that the point a of the driving link moves to the point a', an axial displacement Δ x1 is generated, and at the same time, the driving crank a9 rotates counterclockwise and the crank B10 rotates clockwise. The rotating crank A9 drives the inner cylinder 12 to rotate counterclockwise, and the rotating crank B10 drives the outer cylinder 13 to rotate clockwise. The inner cylinder 12 and the outer cylinder 13 simultaneously drive the inner cylinder connecting rod a12-a, the outer cylinder connecting rod a13-a, the transmission connecting rod c14 and the transmission connecting rod d15 to form a rhombic cyclone execution connecting rod mechanism efgh, the inner cylinder connecting rod b12-b, the outer cylinder connecting rod b13-b, the transmission connecting rod e19 and the transmission connecting rod f20 to form a rhombic flame tube execution connecting rod mechanism eijk to do linear motion through the rotation of the inner cylinder 12 and the outer cylinder 13. So that the point g moves to the point g' to generate an axial displacement Δ x2, all the first sleeves 18 generate an axial displacement Δ x2 under the driving of the link ring 17, and the cover of the first sleeves 18 on the inlet area of the radial cyclone 24 is adjusted to realize the adjustment of the inlet area of the head radial cyclone. Meanwhile, the point j moves to the point j' to generate the axial displacement delta x3, the second sleeve 22 synchronously generates the axial displacement delta x3, and the area of the shielding main burning hole is adjusted. In the process of adjusting the opening area of the combustion chamber, the areas of the head swirler and the flame tube are synchronously changed, and the total opening area of the combustion chamber is kept unchanged in the adjusting process through parameters such as the lengths l1, l2, l3 of the matching connecting rods, initial angles theta, alpha and beta and the like.
The products provided by the present invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the core concepts of the present invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the invention without departing from the inventive concept, and those improvements and modifications also fall within the scope of the claims of the invention.
Claims (9)
1. A variable-geometry combustion chamber comprises a flame tube (3), a casing (1), a fuel system and a head swirler, wherein the swirler is used for conveying air discharged by a compressor into the flame tube (3) in a swirling mode and stabilizing combustion, an air inlet hole is formed in a preset position on a barrel body of the flame tube (3), the variable-geometry combustion chamber is characterized by comprising a driving mechanism (5) installed on the outer surface of the casing (1) and a connecting rod transmission mechanism installed on the casing (1), and the connecting rod transmission mechanism comprises:
the driving mechanism (5) can do linear reciprocating motion to drive the connecting rod transmission mechanism to simultaneously shield the air inlet area of the swirler and the area of the air inlet hole in the flame tube (3) according to the preset area, so that the air flow distribution in the combustion chamber can be adjusted.
2. A variable geometry combustion chamber according to claim 1, wherein the linkage mechanism is capable of adjusting the air flow distribution in the combustion chamber such that the amount of air flow added or subtracted to the swirler is the same or the same as the amount of air flow subtracted or added to the intake port of the flame tube (3).
3. The variable geometry combustion chamber of claim 1 wherein the drive mechanism (5) is a hydraulic cylinder comprising a linearly reciprocating drive link capable of actuating the link drive mechanism to simultaneously block the inlet ports on the swirler and the inlet ports on the circumferential surface of the flame tube (3).
4. A variable geometry combustion chamber according to claim 3, the swirler having circumferentially open intake passages or ports and the liner (3) having circumferentially disposed intake ports, wherein the linkage comprises a first sleeve (18) and a second sleeve (22), wherein: the first sleeve (18) can shield an air inlet channel or an air inlet of the swirler, and the second sleeve (22) can shield an air inlet hole on the flame tube (3).
5. The variable geometry combustor of claim 4 further comprising an outer barrel (13), an inner barrel (12), a mount (11), and first and second link assemblies, wherein:
the outer cylinder (13) and the inner cylinder (12) are rotationally connected in a way of breaking tooth engagement, the mounting seat (11) is fixed on the outer surface of the casing (1), and the outer cylinder (13) and the inner cylinder (12) are rotationally mounted on the mounting seat;
the first connecting rod component is respectively connected with one end of the outer cylinder (13) and one end of the inner cylinder (12), and the driving connecting rod pushes the first connecting rod component to actuate so as to drive the outer cylinder and the inner cylinder to rotate reversely;
the other ends of the outer cylinder (13) and the inner cylinder (12) are respectively connected with the second connecting rod assembly, two ends of the second connecting rod assembly are respectively connected with the first sleeve (18) and the second sleeve (22), and the outer cylinder and the inner cylinder are driven by the driving connecting rod to rotate reversely and then respectively push the first sleeve (18) and the second sleeve (22) to move reversely along the axial direction.
6. The variable geometry combustion chamber of claim 5, wherein the second connecting-rod assembly comprises a first rod (12a), a second rod (12b), a third rod (13a), a fourth rod (13b), a first driven connecting rod, a second driven connecting rod, a fifth rod (16) and a sixth rod (21), wherein:
the first rod (12a) and the second rod (12b) are fixedly connected with the inner cylinder at a preset angle, the third rod (13a) and the fourth rod (13b) are fixedly connected with the outer cylinder at a preset angle, or the first rod (12a) and the second rod (12b) are fixedly connected with the inner cylinder in an integrated manner, and the third rod (13a) and the fourth rod (13b) are fixedly connected with the outer cylinder in an integrated manner;
the first driven connecting rod is symmetrically hinged with the first rod (12a) and the third rod (13a), one end of the first driven connecting rod is connected with the fifth rod (16), and the first sleeve (18) is pushed to move by the fifth rod (16) so as to partially or completely shield an air inlet channel or an air inlet of the cyclone;
the second driven connecting rod is symmetrically hinged with the second rod (12b) and the fourth rod (13b), one end of the second driven connecting rod is connected with the sixth rod (21), and the sixth rod (21) pushes the second sleeve (22) to move so as to partially or completely shield the air inlet at the preset position on the flame tube (3);
the driving connecting rod drives the first sleeve (18) and the second sleeve (22) to respectively shield part or all of air inlets on the swirler and the flame tube (3), so that the variable geometric adjustment of the opening area of the combustion chamber is realized, and further the adjustment and distribution of the air flow are realized.
7. The variable geometry combustion chamber according to claim 6, characterized in that the fifth rod (16) is connected with the first sleeve (18) by a link ring.
8. A variable geometry combustion chamber according to claim 7, characterized in that the first (12a) and third (13a) rods are of the same axial angle, length and/or the second (12b) and fourth (13b) rods are of the same length and axial angle.
9. A variable geometry combustion chamber according to claim 8, characterized in that the length of the first rod (12a) is the same or different from the length of the second rod (12b), and the shielding area of the air holes on the swirler and the combustor basket (3) is adjusted to ensure the same effective area for shielding the swirler or the combustor basket (3).
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Cited By (1)
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| CN116522046A (en) * | 2023-07-04 | 2023-08-01 | 中国航发四川燃气涡轮研究院 | Method for analyzing smoke number of main combustion chamber of engine based on axial partition |
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