A reflow combustion chamber using a visual optical observation structure

Abstract

The present invention provides a reflow combustion chamber adopting a visual optical observation structure, the reflow combustion chamber comprises a combustion chamber casing, an annular flame tube, an inner end cover assembly, an outer end cover assembly, a first observation window and a second observation window, the combustion chamber casing comprises a combustion chamber casing and an outer combustion chamber casing forming a first annular cavity, and a combustion chamber casing cover plate connected to the inner casing; the annular flame tube is arranged in the first annular cavity; the inner end cover assembly is arranged at the rear end of the annular flame tube, and the inner end cover assembly is connected to an exhaust pipe; the outer end cover assembly is arranged at the rear end of the outer combustion chamber casing, and the outer end cover assembly is connected to an intake pipe; the first observation window is arranged in the combustion chamber casing; the second observation window is arranged in the inner end cover assembly and the outer end cover assembly. The reflow combustion chamber of the present invention introduces laser into the annular combustion chamber flame tube through the first observation window, and observes the flow field of the annular combustion chamber flame tube head through the second observation window, so as to realize optical observation of parameters such as fuel concentration distribution, atomization performance, and flow structure characteristics.

Description

Technical Field

[0001] The invention relates to the technical field of aviation gas turbine design, and in particular to a reflow combustion chamber adopting a visible optical observation structure. Background Art

[0002] With the continuous development of society, the requirements for environmental protection are becoming more and more stringent. The continuous iteration of science and technology has also made both ordinary industrial gas turbines and aircraft engines committed to studying how to reduce pollution emissions.

[0003] At present, the existing small engine combustion chamber, due to the influence of design factors such as space volume and weight, adopting the reflux type annular combustion chamber as the core component has become a general development trend. This is not only because the heat resistance strength can be doubled, but also the life of the combustion chamber is greatly extended with the development of air film cooling technology and the improvement of design and process level. In addition, another important reason is that it can shorten the engine shaft by nearly 40%, thereby reducing the engine mass, and matching with the centrifugal compressor, making the overall layout of the engine more reasonable.

[0004] However, in order to understand the influence of the oil mist flow condition in the reflow combustion chamber on the flameout process, it is necessary to obtain the fuel atomization flow parameters in the head of the reflow combustion chamber. However, the reflow combustion chamber is a black box structure and the fuel atomization flow parameters cannot be observed. Summary of the invention

[0005] The present invention provides a reflow combustion chamber with a visible optical observation structure, which is used to solve the defect that parameters such as fuel concentration distribution, atomization performance, flow structure characteristics, etc. cannot be optically observed for the reflow combustion chamber with an existing design structure.

[0006] The present invention provides a reflow combustion chamber using a visible optical observation structure, comprising:

[0007] A combustion chamber casing, the combustion chamber casing comprising a combustion chamber casing, a combustion chamber casing cover plate and a combustion chamber casing outside the combustion chamber casing sleeved on the outer periphery of the combustion chamber casing, the combustion chamber casing cover plate is connected to the rear end of the inner casing, and the combustion chamber casing and the combustion chamber casing outside the combustion chamber casing form a first annular cavity with a rear end opening;

[0008] An annular flame tube is arranged in the first annular cavity, and a first air inlet passage is constructed between the annular flame tube and the combustion chamber casing;

[0009] An inner end cover assembly is arranged at the rear end of the annular flame tube, an exhaust passage is constructed between the inner end cover assembly and the casing cover plate of the combustion chamber, the inner end cover assembly is connected to an exhaust pipe, and the inner cavity of the annular flame tube, the exhaust passage and the exhaust pipe are connected in sequence;

[0010] An outer end cover assembly is arranged at the rear end of the combustion chamber outer casing, a second air intake passage is constructed between the outer end cover assembly and the inner end cover assembly, the outer end cover assembly is connected to an air intake pipe, and the air intake pipe, the second air intake passage and the first air intake passage are connected in sequence;

[0011] A first observation window is arranged in the casing of the combustion chamber, and the matching position of the annular flame tube and the first observation window is a visual structure;

[0012] The second observation window is provided through the inner end cover assembly and the outer end cover assembly; the first observation window is suitable for introducing a light beam into the annular flame tube, and observing the interior of the annular flame tube through the second observation window.

[0013] According to an embodiment of the present invention, a reflow combustion chamber with a visual optical observation structure is provided, wherein the exhaust pipe is connected to the middle of the inner end cover assembly, the intake pipe is connected to the middle of the outer end cover assembly, and the intake pipe is coaxially arranged on the periphery of the exhaust pipe.

[0014] According to a reflow combustion chamber using a visual optical observation structure provided by an embodiment of the present invention, the annular flame tube includes:

[0015] An annular inner cylinder, the annular inner cylinder is sleeved on the outer periphery of the casing in the combustion chamber through a first connecting assembly, and the annular inner cylinder is a visible structure;

[0016] An annular outer cylinder is sleeved on the outer circumference of the annular inner cylinder;

[0017] An annular head connecting the front end of the annular inner cylinder and the front end of the annular outer cylinder;

[0018] The annular inner cylinder, the annular head and the annular outer cylinder are all provided with mixing holes.

[0019] According to a reflow combustion chamber using a visual optical observation structure provided by an embodiment of the present invention, the first connecting component includes:

[0020] A pressure plate, arranged at the rear end of the annular inner cylinder, the pressure plate being in sliding cooperation with the casing inside the combustion chamber;

[0021] A gland connected to a casing cover plate in the combustion chamber;

[0022] An elastic member, passing through the gland and the elastic member via a connecting member and then connected to the pressing plate;

[0023] The rear end of the annular outer cylinder is slidably connected to the inner end cover assembly.

[0024] According to a reflow combustion chamber with a visual optical observation structure provided by an embodiment of the present invention, a plurality of nozzles are arranged circumferentially along the outer casing of the combustion chamber, each nozzle penetrates the outer casing of the combustion chamber and the annular outer tube, and the nozzle opening of the nozzle is located in the inner cavity of the annular flame tube.

[0025] According to a reflow combustion chamber using a visual optical observation structure provided by an embodiment of the present invention, the first observation window includes:

[0026] A first base is disposed on a side wall of a casing in the combustion chamber;

[0027] A first observation window, disposed on the first base;

[0028] The first pressure cover is suitable for fixing the first observation window to the first base.

[0029] According to a reflow combustion chamber using a visual optical observation structure provided by an embodiment of the present invention, the second observation window includes:

[0030] An inner window assembly, comprising an inner base, an inner observation window and an inner pressure cover, wherein the inner base is arranged on the inner end cover assembly, the inner observation window is arranged on the inner base, and the inner pressure cover is suitable for fixing the inner observation window on the inner base;

[0031] The outer window assembly includes an outer base, an outer observation window and an outer pressure cover, wherein the outer base is arranged on the outer end cover assembly, the outer observation window is arranged on the outer base, and the outer pressure cover is suitable for fixing the outer observation window to the outer base; the projection of the inner observation window along the axial direction of the outer casing of the combustion chamber is located inside the outer observation window.

[0032] According to a reflow combustion chamber using a visual optical observation structure provided by an embodiment of the present invention, the inner observation window and the outer observation window are both fan-shaped, and the fan-shaped angle is greater than or equal to a preset angle.

[0033] According to a reflow combustion chamber using a visual optical observation structure provided by an embodiment of the present invention, the first observation window further includes flexible gaskets arranged on both sides of the first observation window.

[0034] According to a reflow combustion chamber with a visual optical observation structure provided by an embodiment of the present invention, the inner window assembly further includes flexible gaskets arranged on both sides of the inner observation window.

[0035] According to a reflow combustion chamber with a visual optical observation structure provided by an embodiment of the present invention, the outer window assembly also includes flexible gaskets arranged on both sides of the outer observation window.

[0036] According to a reflow combustion chamber with a visual optical observation structure provided by an embodiment of the present invention, there are multiple first observation windows and multiple second observation windows, the multiple first observation windows are arranged along the circumference of the inner casing of the combustion chamber, and the multiple second observation windows correspond one-to-one to the positions of the multiple first observation windows.

[0037] The embodiment of the present invention provides a reflow combustion chamber with a visual optical observation structure, in which the combustion chamber casing adopts an annular structure, and the air inlet pipe and the exhaust pipe are arranged on the rear side of the combustion chamber casing. The laser is introduced into the annular combustion chamber flame tube and illuminates the inside of the annular flame tube through a first observation window located on the inner side of the combustion chamber casing, and the flow field at the head of the annular combustion chamber flame tube is observed through a second observation window penetrated through the inner end cover assembly and the outer end cover assembly, so as to realize optical observation of parameters such as fuel concentration distribution, atomization performance, and flow structure characteristics. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0039] Figure 1 It is one of the full cross-sectional views along the axial direction of the reflow combustion chamber using the visual optical observation structure provided by the embodiment of the present invention;

[0040] Figure 2 It is one of the side views of the reflow combustion chamber using the visible optical observation structure provided by the embodiment of the present invention;

[0041] Figure 3 It is one of the assembly schematic diagrams of the second observation window provided by the embodiment of the present invention;

[0042] Figure 4 is a partial cross-sectional view along the axial direction of a reflow combustion chamber using a visible optical observation structure provided by an embodiment of the present invention;

[0043] Figure 5 is a structural schematic diagram of a first observation window provided by an embodiment of the present invention, wherein a is a partial cross-sectional view of the first observation window, b is a three-dimensional structural view of the first observation window, and c is an assembly schematic diagram of the first observation window;

[0044] Figure 6 This is the second full cross-sectional view along the axial direction of the reflow combustion chamber using the visible optical observation structure provided by the embodiment of the present invention;

[0045] Figure 7This is the second side view of the reflow combustion chamber using the visible optical observation structure provided by the embodiment of the present invention;

[0046] Figure 8 This is the second assembly diagram of the second observation window provided by the embodiment of the present invention.

[0047] Reference numerals:

[0048] 1. Casing front end cover; 2. Combustion chamber casing; 3. Combustion chamber outer casing; 4. Combustion chamber outer casing flange; 5. Intake front flange; 6. Connecting pipe; 7. Intake rear flange; 8. Intake pipe; 9. Exhaust pipe; 10. Annular flame tube support block; 11. Annular head; 12. Annular outer tube; 13. Annular flame tube outer wall fixing seat; 14. Swirl guide plate; 15. Annular flame tube support flange; 16. Exhaust flange; 17. Support seat; 18. Annular inner tube; 19. Pressing plate; 20. Elastic member; 21. Pressure cover; 22. Combustion chamber casing cover plate; 23. First base; 24. First observation window; 25. First pressure cover; 26. Inner base; 27. Inner observation window; 28. Inner pressure cover; 29. ​​Outer base; 30. Outer observation window; 31. Outer pressure cover; 32. Nozzle body; 33. Air sleeve. DETAILED DESCRIPTION

[0049] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0050] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0051] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0052] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0053] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0054] Combine the following Figure 1-Figure 8 The embodiment of the present invention describes a reflow combustion chamber using a visual optical observation structure.

[0055] The embodiment of the present invention provides a reflow combustion chamber using a visual optical observation structure. Figure 1 One of the full cross-sectional views along the axial direction of the reflow combustion chamber using the visual optical observation structure provided by the embodiment of the present invention is illustrated, such as Figure 1 As shown, the reflow combustion chamber adopting the visual optical observation structure includes a combustion chamber body, a first observation window and a second observation window.

[0056] Among them, the combustion chamber body includes a combustion chamber casing, an annular flame tube, an inner end cover assembly and an outer end cover assembly. The combustion chamber casing adopts an annular structure. The combustion chamber casing includes a combustion chamber casing 2, a combustion chamber outer casing 3 and a combustion chamber casing cover plate 22; the combustion chamber casing 2 and the combustion chamber outer casing 3 are both hollow cylinders with openings at both ends, and the combustion chamber outer casing 3 is coaxially sleeved on the outer periphery of the combustion chamber casing 2, and there is a distance between the combustion chamber outer casing 3 and the combustion chamber casing 2; the combustion chamber casing cover plate 22 is connected to the rear end of the combustion chamber casing 2, so that a mounting cavity with a front end opening is formed between the combustion chamber casing 2 and the combustion chamber casing cover plate 22; in the embodiment of the present invention, the combustion chamber casing cover plate 22 is fixed to the rear end of the combustion chamber casing 2 by welding, so as to form a semi-closed empty barrel structure.

[0057] Among them, the front end of the outer casing 3 of the combustion chamber is connected to the front end of the inner casing 2 of the combustion chamber through the front end cover 1 of the casing, thereby forming a first annular cavity with a rear end opening between the combustion chamber casing 2, the front end cover 1 of the casing and the outer casing 3 of the combustion chamber; in this embodiment of the present invention, the outer casing 3 of the combustion chamber, the front end cover 1 of the casing and the inner casing 2 of the combustion chamber are fixed by welding.

[0058] It can be understood that the annular flame tube is arranged in the first annular cavity between the combustion chamber casing 2 and the combustion chamber outer casing 3, and there is a distance between the outer wall surface of the annular flame tube and the wall surface of the combustion chamber casing, thereby forming a first air intake channel between the annular flame tube and the combustion chamber casing, and the annular flame tube is provided with a mixing hole connecting the inner cavity of the annular flame tube and the first air intake channel.

[0059] It can be understood that the inner end cover assembly is arranged at the rear end of the annular flame tube, and there is a distance between the inner end cover assembly and the combustion chamber casing cover plate 22, so as to construct an exhaust passage, the inner end cover assembly is connected to an exhaust pipe, and the inner cavity of the annular flame tube, the exhaust passage and the exhaust pipe are sequentially connected. The outer end cover assembly is arranged at the rear end of the combustion chamber casing, and there is a distance between the outer end cover assembly and the inner end cover assembly, so as to construct a second air intake passage, the outer end cover assembly is connected to an air intake pipe, and the air intake pipe, the second air intake passage and the first air intake passage are sequentially connected.

[0060] It can be understood that the first observation window is located in the installation cavity and is arranged on the side wall of the combustion chamber casing 2, the second observation window penetrates the inner end cover assembly and the outer end cover assembly, and a plurality of nozzles are arranged in the combustion chamber casing, and the nozzle openings of the nozzles extend into the inner cavity of the annular flame tube.

[0061] It can be understood that the first observation window is suitable for introducing the laser into the annular flame tube, and the cooperation position of the annular flame tube and the first observation window is a visualization structure. The laser sheet light path passes through the first observation window and the visualization structure of the annular flame tube to enter the annular flame tube and illuminate the inside of the annular flame tube. At the same time, the observation equipment located outside the second observation window observes the irradiated area inside the annular flame tube through the second observation window to obtain the atomization flow parameters of the fuel sprayed from the nozzle in the annular flame tube.

[0062] It should be noted that the incoming air passes through the air intake pipe, the second air intake channel, the first air intake channel, and enters the annular flame tube through the mixing holes on the annular flame tube. At the same time, the nozzle on the combustion chamber casing sprays fuel into the annular flame tube. The incoming air entering through the mixing holes and the fuel sprayed by the nozzle are atomized and flow in the inner cavity of the annular flame tube. The fuel atomization in the annular flame tube can be observed through the observation equipment located on the outside of the second observation window, and the velocity field, concentration field and other parameters of the fuel distribution can be quantitatively measured; the atomized fuel flows from the annular flame tube through the exhaust channel and the exhaust pipe and is discharged.

[0063] The embodiment of the present invention provides a reflow combustion chamber with a visual optical observation structure, in which the combustion chamber casing adopts an annular structure, and the air inlet pipe and the exhaust pipe are arranged on the rear side of the combustion chamber casing. The laser is introduced into the annular combustion chamber flame tube and illuminates the inside of the annular flame tube through a first observation window located on the inner side of the combustion chamber casing, and the flow field at the head of the annular combustion chamber flame tube is observed through a second observation window penetrated through the inner end cover assembly and the outer end cover assembly, so as to realize optical observation of parameters such as fuel concentration distribution, atomization performance, and flow structure characteristics.

[0064] According to an embodiment of the present invention, a plurality of nozzles are arranged on the side wall of the combustion chamber casing, and the plurality of nozzles are arranged circumferentially along the combustion chamber outer casing 3. Each nozzle penetrates the combustion chamber outer casing 3 and the annular outer tube 12, and the nozzle opening is located in the inner cavity of the annular flame tube.

[0065] It should be noted that a plurality of nozzles are installed circumferentially on the outer side wall of the combustion chamber casing, and each nozzle is arranged radially, which can shorten the overall axial dimension of the reflow combustion chamber.

[0066] It should be noted that in the prior art, in order to understand the flame propagation morphology in the combustion chamber and optimize the ignition and flameout process, it is necessary to perform visual optical observation and optical measurement of the internal area of ​​the combustion chamber. However, due to the compact overall structure and complex radial structure of the recirculation combustion chamber, the radial installation method of the fuel nozzle and other problems, the outer wall of the combustion chamber cannot be directly observed through a window. Therefore, the reflow combustion chamber with a visual optical observation structure provided in the embodiment of the present invention can optically observe and measure the velocity field and concentration field of the fuel spray in the test area in the annular flame tube by simplifying the combustion chamber body structure and designing the first observation window and the second observation window while retaining the fuel atomization flow characteristics in the existing combustion chamber, by using measurement means such as PIV (Particle Image Velocimetry, also known as particle image velocimetry) and PMie, and can perform slice shooting tests (precision slice visualization optical observation) and three-dimensional measurements with millimeter-level accuracy in the observation direction, thereby providing adjustment data support for the fuel concentration distribution, which is beneficial to ensure that the reflow combustion chamber has good ignition and flameout performance under different working conditions, thereby providing a strong experimental data basis support for subsequent combustion chamber optimization and reduction of pollutant emissions, thereby achieving the purpose of improving the ignition and flameout performance of the combustion chamber and reducing pollutant emissions.

[0067] The area to be tested is an area in the annular flame tube that contains at least one complete nozzle. In this embodiment, the fan-shaped area between two complete nozzles in the annular flame tube is taken as the area to be tested. Of course, in other embodiments, the area to be tested may be an area between three or more complete nozzles.

[0068] It should be noted that several nozzles are installed circumferentially on the combustion chamber casing. The different numbers of nozzles will result in different fan-shaped areas between adjacent nozzles, that is, different areas to be tested. In this way, the size of the second observation window can be reasonably designed according to the number of nozzles. For example, the number of nozzles is 10, and the angle between the center lines of two adjacent nozzles is 30°. The fan-shaped area (area to be tested) between two complete nozzles should be greater than 30°. For example, the area to be tested is 38°, and the fan-shaped angle of the observable part of the second observation window can be designed to be between 38° and 360°.

[0069] According to an embodiment of the present invention, the annular flame tube includes an annular inner tube 18, an annular outer tube 12 and an annular head 11; the annular inner tube 18 is sleeved on the outer periphery of the casing 2 in the combustion chamber through a first connecting component, the annular outer tube 12 is sleeved on the outer periphery of the annular inner tube 18, and the annular head 11 connects the front end of the annular inner tube 18 and the front end of the annular outer tube 12.

[0070] The annular inner cylinder 18 needs to allow the laser sheet light to pass through, so the annular inner cylinder 18 can be a visual structure made entirely of glass material. The annular inner cylinder 18 can be made of a complete cylindrical transparent glass with holes.

[0071] Among them, the outer wall of the combustion chamber inner casing 2 is provided with an annular flame tube support block 10, the front end of the annular inner cylinder 18 is supported on the annular flame tube support block 10 through a support seat 17, and the rear end of the annular inner cylinder 18 is slidably connected with the combustion chamber inner casing 2 through a first connecting component. Under the action of the first connecting component, the annular inner cylinder 18 can move forward and backward along the axial direction of the combustion chamber inner casing 2. In this embodiment, the annular outer cylinder 12, the annular head 11 and the support seat 17 are welded together, and the movement of the annular inner cylinder 18 is the movement of the annular flame tube as a whole.

[0072] It can be understood that the annular inner cylinder 18, the annular outer cylinder 12 and the annular head 11 are all provided with mixing holes and cooling holes.

[0073] It is understandable that the front end of the annular inner tube 18 and the front end of the annular outer tube 12 are connected through the annular head 11, and the inner cavity of the annular flame tube is a second annular cavity with a rear end opening. In this way, the combustion chamber casing of this embodiment adopts an annular structure, and the flow structure in the head is an annular vortex form.

[0074] In this embodiment, the first connecting assembly not only connects the rear end of the annular inner cylinder 18 and the inner casing 2 of the combustion chamber, but also seals the cavity between the rear end of the annular inner cylinder 18 and the rear end of the inner casing 2 of the combustion chamber. The axial length of the annular outer cylinder 12 is greater than the axial length of the annular inner cylinder 18, and the inner end cover assembly is connected to the rear end of the annular outer cylinder 12, thereby achieving the sealing of the inner cavity of the annular flame cylinder.

[0075] It can be understood that a plurality of nozzles are circumferentially installed on the outer side wall of the combustion chamber outer casing 3, and the nozzles are radially penetrated in the combustion chamber casing and the annular flame tube. A first mounting hole for installing the nozzle is provided on the combustion chamber outer casing 3, and a second mounting hole for installing the nozzle is provided on the annular outer tube 12. The nozzles are penetrated in the first mounting hole and the second mounting hole, and the nozzles are fixed to the combustion chamber outer casing 3 by bolts, and the nozzle orifices of the nozzles are located in the inner cavity of the annular flame tube.

[0076] It should be noted that when assembling the nozzle on the annular flame tube and the combustion chamber casing, the positions of the first mounting hole and the second mounting hole need to be aligned, but due to processing errors or assembly errors, the first mounting hole and the second mounting hole may not be aligned, so that the nozzle cannot be accurately installed with the combustion chamber casing and the annular flame tube. Therefore, the annular inner tube 18 (annular flame tube) of the embodiment of the present invention is connected to the combustion chamber outer casing 3 (combustion chamber casing) through a first connecting component. Under the action of the first connecting component, the annular flame tube can be moved forward and backward along the axial direction of the combustion chamber casing to adjust the position, thereby achieving the alignment of the first mounting hole on the combustion chamber outer casing 3 and the second mounting hole on the annular outer tube 12, thereby facilitating the rapid assembly of the nozzle with the combustion chamber casing and the annular flame tube.

[0077] The embodiment of the present invention provides a reflow combustion chamber with a visual optical observation structure, and the annular flame tube is slidingly connected to the combustion chamber casing through a first connecting component. Under the action of the first connecting component, the annular inner tube 18 can be moved forward and backward along the axial direction of the combustion chamber casing to adjust the position, thereby realizing the alignment of the first mounting hole on the combustion chamber outer casing 3 and the second mounting hole on the annular outer tube 12, thereby facilitating the accurate assembly of the nozzle with the combustion chamber casing and the annular flame tube.

[0078] In a preferred embodiment of the present invention, the first connecting assembly includes a pressure plate 19, a pressure cover 21 and an elastic member 20. The pressure plate 19 is arranged at the rear end of the annular inner tube 18. The pressure plate 19 is slidably matched with the casing 2 in the combustion chamber. The pressure cover 21 is connected to the casing cover plate 22 in the combustion chamber, and is connected to the pressure plate 19 after passing through the pressure cover 21 and the elastic member 20 through the connecting member.

[0079] It can be understood that the annular inner tube 18 is extruded and connected with the pressure cover 21 through the pressure plate 19 and the elastic member 20, wherein the pressure plate 19 can slide on the side wall of the combustion chamber casing 2, and the pressure cover 21 is fixed to the combustion chamber casing cover plate 22 by bolts; correspondingly, the rear end of the annular outer tube 12 is slidably connected with the inner end cover assembly.

[0080] It should be noted that the pressure plate 19 and the pressure cover 21 are both annular structures, and there are multiple connecting parts and elastic parts 20 evenly distributed circumferentially. The pressure plate 19 and the pressure cover 21 are both provided with assembly holes that cooperate with the multiple connecting parts; in this embodiment, the elastic part 20 can be a spring and the connecting part can be a bolt.

[0081] It should be noted that the distance between the pressure plate 19 and the pressure cover 21 can be adjusted through the connecting piece, so as to achieve the front and rear (axial direction of the combustion chamber body) movement of the annular flame tube relative to the combustion chamber casing.

[0082] According to the embodiment of the present invention, the inner end cover assembly includes an exhaust flange 16 and an annular flame tube supporting flange 15 .

[0083] It can be understood that the annular flame tube support flange 15 is arranged on the outer wall of the rear end of the annular outer tube 12, the exhaust flange 16 is connected to the annular flame tube support flange 15, there is an axial distance between the exhaust flange 16 and the combustion chamber casing cover 22, and an exhaust channel connected to the inner cavity of the annular flame tube is formed between the exhaust flange 16 and the combustion chamber casing cover 22. The front end of the exhaust pipe 9 is penetrated through the middle of the exhaust flange 16, and the inner cavity of the exhaust pipe 9 is connected to the exhaust channel.

[0084] It should be noted that, when the annular flame tube is slidingly connected to the combustion chamber casing through the first connecting component, the annular outer tube 12 and the annular flame tube support flange 15 are slidingly matched. In this embodiment, the inner annular surface of the annular flame tube support flange 15 is provided with an annular groove, and the outer wall of the annular outer tube 12 is provided with an annular flame tube outer wall fixing seat 13 that cooperates with the annular groove. The annular flame tube outer wall fixing seat 13 is an annular protruding structure. When the position of the annular flame tube is adjusted by the connecting piece, the annular flame tube outer wall fixing seat 13 on the outer wall of the annular outer tube 12 moves synchronously in the annular groove of the annular flame tube support flange 15, so that the annular flame tube support flange 15 and the annular outer tube 12 are slidingly connected through the annular flame tube outer wall fixing seat 13.

[0085] In one embodiment of the present invention, the outer end cover assembly includes an air intake front flange 5, a connecting pipe 6, and an air intake rear flange 7 which are connected in sequence.

[0086] Among them, the outer end cover is connected to the combustion chamber outer casing 3, and there is a distance between the outer end cover and the exhaust flange 16, so that an intake cavity connected to the first intake channel is formed between the outer end cover and the exhaust flange 16, and the front end of the intake pipe 8 is penetrated through the outer end cover, and the intake pipe 8 forms an intake duct connected to the intake cavity, so the incoming air passes through the intake duct and the intake cavity in turn into the space (first intake channel) between the combustion chamber outer casing 3 and the annular outer cylinder 12.

[0087] It can be understood that a combustion chamber outer casing flange 4 is provided at the rear end of the combustion chamber outer casing 3, the combustion chamber outer casing flange 4 and the combustion chamber outer casing 3 are connected together by welding, the combustion chamber outer casing flange 4 is connected to the intake front flange 5, the connecting pipe 6 is arranged on the outside of the exhaust flange 16 and the annular flame tube support flange 15, the intake rear flange 7 is arranged at an interval on the rear side of the exhaust flange 16, and a second intake channel is formed between the connecting pipe 6, the intake rear flange 7 and the exhaust flange 16, the front section of the intake pipe 8 is penetrated through the middle of the intake rear flange 7, and the inner cavity of the intake pipe 8 is connected to the second intake channel.

[0088] It can also be understood that a swirl guide plate 14 is provided between the air intake front flange 5 and the annular flame tube support flange 15, and the swirl guide plate 14, the air intake front flange 5 and the annular flame tube support flange 15 are welded together.

[0089] It can be understood that the incoming air passes through the intake pipe and enters the space between the intake rear flange 7 and the exhaust flange 16, and then passes through the connecting pipe 6 and the swirl guide plate 14 to enter the first intake channel between the combustion chamber outer casing 3 and the annular outer tube 12, and then enters the annular flame tube through the mixing hole on the annular flame tube. The fuel sprayed from the nozzle is atomized in the annular flame tube cavity, and finally the atomized fuel flows from the rear side of the annular flame tube cavity through the exhaust channel and the exhaust duct to be discharged.

[0090] It should be noted that the air intake pipe 8, the air intake rear flange 7, the connecting pipe 6 and the air intake front flange 5 constitute an extension of the outer casing 3 of the combustion chamber; the exhaust pipe 9 and the exhaust flange 16 constitute an extension of the inner casing 2 of the combustion chamber, and are fixedly connected to the annular flame tube support flange 15 inside the rear section of the combustion chamber by bolts.

[0091] It can be understood that the intake pipe 8 is coaxially arranged with the exhaust pipe 9, and the intake pipe 8 is coaxially sleeved with the outer periphery of the exhaust pipe 9. The intake pipe 8 is connected to the middle of the intake rear flange 7, and the exhaust pipe 9 is connected to the middle of the exhaust flange 16. Then, an annular intake duct is formed between the inner wall of the intake pipe 8 and the outer wall of the exhaust pipe 9. Correspondingly, an annular intake cavity connected to the annular intake duct is formed between the outer walls of the intake rear flange 7, the exhaust flange 16 and the exhaust pipe 9.

[0092] According to an embodiment of the present invention, the nozzle includes an air sleeve 33 and a nozzle body 32 arranged in the air sleeve 33, the air sleeve 33 has a mounting cavity with one end open, the side wall of the air sleeve 33 is provided with an air inlet hole connected to the mounting cavity, and the center line of the air inlet hole does not pass through the center axis of the air sleeve 33; an atomization outlet is opened at the nozzle matching position of the air sleeve 33 and the nozzle body 32, and the atomization outlet forms a lip structure.

[0093] It can be understood that if the center line of the air inlet hole does not pass through the center line of the air sleeve 33, the air inlet direction of the air inlet hole adopts non-radial air inlet.

[0094] It can be understood that the inlet end of the air inlet hole is located in the first air inlet passage and communicates with the first air inlet passage.

[0095] It is understandable that the air intake direction of the existing sleeve adopts radial air intake, and the air entering the sleeve through the air intake hole flows chaotically. However, the present embodiment adopts a non-radial air intake method, which can make the air flow in the air intake air sleeve 33 become an orderly swirl flow, and maintain it to the nozzle slit between the lower end of the air sleeve 33 and the nozzle, and use aerodynamic force and centrifugal force to make the fuel sprayed from the nozzle of the nozzle body 32 more thoroughly atomized, and at the same time, it can also make it more fully premixed with air.

[0096] It should be noted that, in the embodiment of the present invention, the center line of the air inlet hole on the air sleeve 33 does not pass through the center axis of the air sleeve 33, so that the air intake adopts a non-radial intake method, and the air flow into the air sleeve 33 is an orderly swirl method. The aerodynamic force and centrifugal force are used to make the fuel sprayed from the nozzle body 32 more thoroughly atomized, and at the same time make it more fully premixed with the air, thereby improving the atomization quality of the fuel, thereby improving the ignition performance and combustion efficiency, and reducing pollutant emissions.

[0097] It can be understood that the combustion chamber casing is an annular structure, and the air sleeve 33 and the nozzle body 32 arranged on the outer wall of the combustion chamber outer casing 3 are used to spray fuel and air into the combustion chamber head (annular flame tube) at a three-dimensional angle with the axial direction, so as to form an annular vortex flow structure at the combustion chamber head. The casing front end cover 1, the combustion chamber casing 2, the combustion chamber outer casing 3, the combustion chamber outer casing flange 4, the intake front flange 5, the intake pipe 8, the intake rear flange 7, the intake pipe 8 and the combustion chamber casing cover plate 22 constitute the outer contour of the combustion chamber casing. The incoming air enters the combustion chamber casing after being expanded and swirled through the intake pipe 8 and the swirl guide plate 14, wherein the air enters the space surrounded by the annular outer cylinder 12, the annular inner cylinder 18 and the annular head 11 through the mixing holes and cooling holes on the annular outer cylinder 12, the annular inner cylinder 18 and the annular head 11, and is mixed with the fuel sprayed by the nozzle to complete the combustion. Mixed air of different proportions enters the annular flame tube from the mixing holes and mixes with the high-temperature combustion gas in the combustion zone, thereby meeting the requirements of air and fuel distribution ratio in different combustion organization modes. Among them, there can be many combustion organization modes, such as rich / quenched / lean (RQL) combustion technology, staged combustion technology, premixed or semi-premixed combustion technology, etc.

[0098] The embodiment of the present invention provides a reflow combustion chamber with a visible optical observation structure. The nozzle adopts a combination of a radially arranged air sleeve 33 and a nozzle body 32 arranged in the air sleeve 33. Without using a head swirler structure, the oil mist spraying direction forms a three-dimensional spatial angle with the axial direction, so that the flow of the combustion chamber head is a vortex structure, so that the atomized fuel can be better mixed with the incoming air. This combination has a simple structure and is easy to process. The nozzle body 32 has strong assembly adaptability and can be easily replaced to adapt to nozzle bodies 32 with different flow rates and air sleeves 33 with different swirl numbers. This allows the fuel concentration distribution under different actual working conditions to be observed and adjusted, thereby providing strong support for subsequent combustion optimization and reducing pollutant emissions to the greatest extent.

[0099] The reflow combustion chamber with a visual optical observation structure provided in the embodiment of the present invention can match different types of combustion technology methods, greatly expanding the scope of application; the reflow type combustion chamber casing and the radially arranged nozzle structure can more effectively utilize the volume of the combustion chamber casing, significantly shorten the wheelbase of the engine in application, and can intuitively and effectively adjust the equivalence ratio selection in the combustion chamber according to the measurement results, thereby improving the combustion conditions and reducing pollution emissions.

[0100] In one embodiment of the present invention, Figure 4 and Figure 5 As shown, the first observation window includes a first base 23 , a first observation window 24 and a first pressure cover 25 .

[0101] The first base 23 is disposed on the side wall of the casing 2 in the combustion chamber, the first observation window 24 is disposed on the first base 23 , and the first pressure cover 25 is connected to the first base 23 , suitable for pressing and fixing the first observation window 24 on the first base 23 .

[0102] It is understandable that the first observation window 24 can be a square structure, and the first pressure cover 25 and the first base 23 are both provided with first observation holes adapted to the first observation window 24 . The first observation window 24 is tightened and fixed by bolts arranged around the first pressure cover 25 .

[0103] It can be understood that a first base 23 is embedded and welded on the side wall of the combustion chamber inner casing 2, and the bottom diameter of the first base 23 can be consistent with the diameter of the combustion chamber inner casing 2, so that the first base 23 and the combustion chamber inner casing 2 can remain coplanar; the first base 23 and the first pressure cover 25 are tightened by bolt connection, and the first base 23 is welded to the combustion chamber inner casing 2, which ensures the overall sealing of the combustion chamber casing and leaves space for the introduction of laser sheet light.

[0104] It should be noted that the laser sheet light passes through the first observation window 24 and the annular inner tube 18 and enters the annular flame tube, and illuminates the area to be measured inside the annular flame tube. The laser sheet light can directly enter the first observation window 24 along the radial direction of the combustion chamber inner casing 2, or a reflector can be set at the center of the installation cavity formed by the combustion chamber inner casing 2 and the combustion chamber inner casing cover 22, and the transmission direction of the laser sheet light can be changed by the reflector, so that the light path enters the first observation window 24 along the radial direction of the combustion chamber inner casing 2; for example, the reflector is a reflector set at 45°, and the incident direction of the laser sheet light is adjusted by 90° and then vertically enters the first observation window 24.

[0105] It should be noted that the translation distance of the reflector can be adjusted by a displacement mechanism. Specifically, the reflector can be installed on the displacement mechanism, and the translation distance of the reflector relative to the first observation window 24 on the casing 2 in the combustion chamber can be adjusted by the displacement mechanism (adjustable range 0-100mm, accuracy 0.1mm) to cover the observable width of the first observation window 24 (for example, 50mm), so as to perform precise slicing and irradiation of the fuel distribution conditions in the area to be tested in the annular flame tube.

[0106] It can be understood that after the laser sheet light is reflected by the reflector arranged in the casing 2 in the combustion chamber, it passes through the first observation window 24 and the annular inner cylinder 18 made of glass and then enters the interior of the annular flame tube, irradiating a slice of the fan-shaped area (area to be tested) containing at least one complete nozzle. The light scattered on the laser irradiated slice due to the fuel distribution will pass through the inner observation window 27 and the outer observation window 30 in turn, and then be directly captured by the observation equipment arranged outside the outer observation window 30, such as a camera.

[0107] In one embodiment of the present invention, Figure 1 and Figure 3 As shown, the second observation window includes an inner window component and an outer window component.

[0108] It can be understood that the inner window assembly is located at the extension part of the inner casing 2 of the combustion chamber, the exhaust flange 16 is provided with a first observation window that cooperates with the inner window assembly, and the inner window assembly is arranged at the first observation window of the exhaust flange 16; the outer window assembly is located at the extension part of the outer casing 3 of the combustion chamber, the intake rear flange 7 is provided with a second observation window that cooperates with the outer window assembly, and the outer window assembly is arranged at the second observation window of the intake rear flange 7.

[0109] Among them, the inner window assembly includes an inner base 26, an inner observation window 27 and an inner pressure cover 28. The inner base 26 is arranged at the first observation window of the exhaust flange 16, the inner observation window 27 is arranged on the inner base 26, the inner pressure cover 28 is connected to the inner base 26, and is suitable for fixing the inner observation window 27 to the inner base 26.

[0110] Among them, the outer window assembly includes an outer base 29, an outer observation window 30 and an outer pressure cover 31. The outer base 29 is arranged at the second observation window of the air intake rear flange 7, the outer observation window 30 is arranged on the outer base 29, and the outer pressure cover 31 is connected to the outer base 29 and is suitable for fixing the outer observation window 30 to the outer base 29; the inner observation window 27 is located on the inner side of the outer observation window 30, and the projection of the inner observation window 27 along the axial direction of the outer casing 3 of the combustion chamber is located inside the outer observation window 30.

[0111] It can be understood that the connection between the inner pressure cover 28 and the inner base 26 can be connected by bolts, so that the inner observation window 27 is pressed and sealed on the inner base 26, and an inner observation hole matching the inner observation window 27 is provided on the inner pressure cover 28 and the inner base 26; the connection between the outer pressure cover 31 and the outer base 29 can also be connected by bolts, so that the outer observation window 30 is pressed and sealed on the outer base 29, and an outer observation hole matching the outer observation window 30 is provided on the outer pressure cover 31 and the outer base 29.

[0112] It can be understood that the observation device located outside the second observation window observes the illuminated area inside the annular flame tube through the outer observation window 30 and the inner observation window 27 to obtain the fuel atomization and other conditions of the nozzle in the annular flame tube.

[0113] In a preferred embodiment of the present invention, the inner observation window 27 and the outer observation window 30 are both fan-shaped, and the fan-shaped angles of the inner observation window 27 and the outer observation window 30 are both greater than or equal to a preset angle.

[0114] It can be understood that the inner observation window 27 is fan-shaped, and the inner observation hole of the inner base 26 and the inner observation hole of the inner pressure cover 28 are both fan-shaped holes that match the inner observation window 27; the outer observation window 30 is fan-shaped to match the inner observation window 27, and the outer observation hole of the outer pressure cover 31 and the outer observation hole of the outer base 29 are both fan-shaped holes that match the outer observation window 30.

[0115] It should be noted that the inner observation window 27 and the outer observation window 30 should be able to cover the fan-shaped area containing at least one nozzle, so as to realize the observation of the fuel atomization of the nozzle in the annular flame tube. Therefore, the fan-shaped angle of the inner observation window 27 and the fan-shaped angle of the outer observation window 30 should be greater than the preset angle, and the radial width of the inner observation window 27 and the outer observation window 30 should be greater than the preset width. The preset width is to be able to completely cover the radial area containing the fuel nozzle spray in the annular flame tube, so as to realize the fuel atomization of the nozzle in the annular flame tube. Among them, the preset angle is the fan-shaped angle corresponding to the fan-shaped area containing at least one nozzle.

[0116] It can be understood that the range of the fan-shaped angle of the observable part of the inner observation window 27 and the outer observation window 30 is between A° and 360°, wherein A is a preset angle, which should be able to cover at least a fan-shaped area where one nozzle is located, and the radial width of the visible part should also be able to observe the injection position of the fuel nozzle nozzle in the annular flame tube.

[0117] It can be understood that the maximum fan-shaped angle range of the observable parts of the inner observation window 27 and the outer observation window 30 is 360°, the number of which is designed to be 1 each, and the radial width can be designed to be 57 mm, so that a larger range of the combustion chamber head area can be observed and measured, providing data support for other studies such as flame propagation mechanism, ignition and cross-flame process, etc.

[0118] In another preferred embodiment of the present invention, the extension lines of the straight edges at both ends of the inner observation window 27 do not pass through the axis point of the combustion chamber casing, and the fan-shaped angle bisector of the inner observation window 27 passes through the axis point of the combustion chamber casing first; correspondingly, the extension lines of the straight edges at both ends of the outer observation window 30 do not pass through the axis point of the combustion chamber casing, and the fan-shaped angle bisector of the outer observation window 30 passes through the axis point of the combustion chamber casing first. In this way, the observation area of ​​the second observation window can be more reasonable, and more information can be observed within a limited angle range.

[0119] In one embodiment of the present invention, the first observation window further includes flexible gaskets disposed on both sides of the first observation window 24; the inner window assembly further includes flexible gaskets disposed on both sides of the inner observation window 27, and the outer window assembly further includes flexible gaskets disposed on both sides of the outer observation window 30. The flexible gaskets may be graphite gaskets.

[0120] It can be understood that flexible gaskets are provided on both sides of the first observation window 24, both sides of the inner observation window 27 and both sides of the outer observation window 30, and are tightened and fixed by bolts arranged along the center line of the pressure cover, so that the first observation window and the second observation window can maintain the good sealing of the whole reflow combustion chamber under the test conditions of temperature and pressure (500K, 1MPa) while ensuring the observability of the experimental results.

[0121] The reflow combustion chamber with a visible optical observation structure provided in the embodiment of the present invention can realize precise sliced ​​optical observation and measurement of the fuel concentration velocity field and concentration field distribution in the temperature and pressure combustion chamber under the action of a flexible gasket.

[0122] In one embodiment of the present invention, the first observation window and the second observation window are both multiple, and the multiple first observation windows are arranged along the circumferential direction of the side wall of the casing 2 in the combustion chamber, and the positions of the multiple second observation windows correspond to the multiple first observation windows one by one.

[0123] It can be understood that the first observation window and the second observation window can both be one, and the installation positions of the first observation window and the second observation window should satisfy: the observable area of ​​the first observation window and the observable area of ​​the second observation window have an overlapping area, and the overlapping area is located in the area to be measured in the annular flame tube.

[0124] It can be understood that there can be multiple first observation windows and multiple second observation windows, and multiple first observation windows are arranged circumferentially on the side wall of the combustion chamber casing 2, and correspondingly, multiple inner window assemblies of the second observation windows are arranged circumferentially on the exhaust flange 16, and multiple outer window assemblies of the second observation windows are arranged circumferentially on the intake rear flange 7.

[0125] It should be noted that the first observation window and the second observation window can be considered to be used in combination, and the number of the first observation window and the second observation window are the same, and the positions correspond one to one, and the positions of the inner window component and the outer window component of each second observation window correspond one to one front to back.

[0126] It should be noted that in order to realize the observation of multiple areas inside the annular flame tube, the first observation window and the second observation window can be designed as one to increase the observation area of ​​the first observation window and the second observation window; the first observation window and multiple second observation windows can also be designed as multiple, and the multiple first observation windows and multiple second observation windows can be evenly distributed or unevenly distributed along the circumferential direction, and the fan-shaped angle of the second observation window can be reasonably designed according to the number to adapt to the required observation fan-shaped area inside the annular flame tube.

[0127] In one embodiment of the present invention, Figure 2 The example shows the range of the fan-shaped area in the combustion chamber head that can be seen through the second observation window and the actual size that can be seen within the fan-shaped area when observing and photographing from the front along the axial direction. Figure 3 The following example illustrates the disassembly and assembly relationship between the inner form component and the outer form component. Figure 2 As shown, the number of the second observation windows is one, the fan-shaped angle of the inner observation window 27 is designed to be 72°, and the radial width of the inner observation window 27 is designed to be 57mm, that is, the fan-shaped angle of the observable part of the inner window assembly is 72°, and the radial width of the visible part is 57mm, which can completely cover the radial area of ​​the annular flame tube containing the nozzle spray, and the material width of the inner pressure cover 28 is 19.5mm, the maximum diameter is 424mm, the minimum diameter is 234mm, and the boss height of the inner pressure cover 28 is 8mm and the width is 4.5mm. The fan-shaped angle of the outer observation window 30 is designed to be 76°, and the radial width of the outer observation window 30 is designed to be greater than 57mm, that is, the fan-shaped angle of the observable part of the outer window assembly is 76°, and the material width of the outer pressure cover 31 is 26mm, the maximum diameter is 492mm, the minimum diameter is 172mm, and the boss height of the outer pressure cover 31 is 5mm and the width is 9.5mm.

[0128] In a specific embodiment of the present invention, Figure 4 and Figure 5 As shown, the front of the first observation window 24 adopts a square structure, the maximum size of the first pressure cover 25 is 138mm*98mm, the first observation window 24 adopts square glass with a size of 106.5mm*66.5mm, and the maximum size range of the laser sheet light that can penetrate the first observation window 24 is 90mm*50mm.

[0129] Among them, the first observation window 24 also has graphite gaskets on both sides, which are tightened and fixed by bolts arranged around the first pressure cover 25. The bottom diameter of the first base 23 of this embodiment is 246mm, which is consistent with the diameter of the combustion chamber casing 2, so that the whole can be embedded in the outer wall of the combustion chamber casing 2 and welded.

[0130] In another embodiment of the present invention, Figure 6 and Figure 7 As shown, there are two second observation windows, the two first observation windows are evenly distributed circumferentially, the two second observation windows are also evenly distributed circumferentially, and the fan-shaped angle between the inner observation window 27 and the outer observation window 30 of each second observation window is designed to be 180°.

[0131] It can be understood that the extension lines of the fan-shaped straight sides of the inner observation window 27 and the outer observation window 30 do not pass through the axis point, but are still on the vertical axis. Figure 6 The example shows the range of the fan-shaped area in the combustion chamber head that can be seen through the second observation window and the actual size that can be seen within the fan-shaped area when observing and photographing from the front along the axial direction. Figure 8 The disassembly and assembly superposition relationship structure and symmetrical arrangement combination of the inner window assembly and the outer window assembly can be clearly seen. This arrangement can include an area where 4 complete nozzles are located in a second observation window, and the area where 8 nozzles are located can be observed as a whole. Similarly, in order to solve the problem of introducing the optical path of the laser sheet light into the annular flame tube, the corresponding first observation window is designed to be two on the basis of ensuring that the appearance structure remains consistent, and the two first observation windows are centrally symmetrical. The other components that need to be adapted and modified due to the change in the number and sector angle of the second observation window are marked with serial numbers on the figure, namely, the combustion chamber casing 2, the intake rear flange 7, the exhaust flange 16, the first base 23, the first observation window 24, the first pressure cover 25, the inner base 26, the inner observation window 27, the inner pressure cover 28, the inner base 26, the outer base 29, the outer observation window 30, and the outer pressure cover 31.

[0132] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A reflow combustion chamber using a visual optical observation structure, characterized in that: include: A combustion chamber casing, the combustion chamber casing comprising a combustion chamber casing (2), a combustion chamber casing inner casing cover plate (22), and a combustion chamber casing outer casing (3) sleeved on the outer periphery of the combustion chamber casing (2), the combustion chamber casing cover plate (22) being connected to the rear end of the inner casing (2), the combustion chamber casing (2) and the combustion chamber casing outer casing (3) forming a first annular cavity with a rear end opening; An annular flame tube is arranged in the first annular cavity, and a first air inlet passage is constructed between the annular flame tube and the combustion chamber casing; An inner end cover assembly is arranged at the rear end of the annular flame tube, an exhaust passage is constructed between the inner end cover assembly and the casing cover plate (22) in the combustion chamber, the inner end cover assembly is connected to an exhaust pipe (9), and the inner cavity of the annular flame tube, the exhaust passage and the exhaust pipe (9) are connected in sequence; An outer end cover assembly is arranged at the rear end of the combustion chamber outer casing (3), a second air intake passage is constructed between the outer end cover assembly and the inner end cover assembly, the outer end cover assembly is connected to an air intake pipe (8), and the air intake pipe (8), the second air intake passage and the first air intake passage are connected in sequence; A first observation window is arranged in the casing (2) in the combustion chamber, and the matching position of the annular flame tube and the first observation window is a visual structure; A second observation window is provided through the inner end cover assembly and the outer end cover assembly; the first observation window is suitable for introducing a light beam into the annular flame tube, and observing the interior of the annular flame tube through the second observation window; Wherein, the first observation window includes: A first base (23) is arranged on a side wall of the casing (2) in the combustion chamber; A first observation window (24), arranged on the first base (23); A first gland (25) adapted to fix the first observation window (24) to the first base (23); The second observation window includes: An inner window assembly, comprising an inner base (26), an inner observation window (27) and an inner pressure cover (21), wherein the inner base (26) is arranged on the inner end cover assembly, the inner observation window (27) is arranged on the inner base (26), and the inner pressure cover (21) is suitable for fixing the inner observation window (27) on the inner base (26); An outer window assembly comprises an outer base (29), an outer observation window (30) and an outer pressure cover (31); the outer base (29) is arranged on the outer end cover assembly, the outer observation window (30) is arranged on the outer base (29), and the outer pressure cover (31) is suitable for fixing the outer observation window (30) to the outer base (29); the inner observation window (27) is located inside the outer observation window (30) along the axial projection of the combustion chamber outer casing (3).

2. The reflow combustion chamber with a visual optical observation structure according to claim 1, characterized in that: The exhaust pipe (9) is connected to the middle of the inner end cover assembly, the intake pipe (8) is connected to the middle of the outer end cover assembly, and the intake pipe (8) is coaxially arranged on the outer periphery of the exhaust pipe (9).

3. The reflow combustion chamber with a visual optical observation structure according to claim 2, characterized in that: The annular flame tube comprises: An annular inner cylinder (18), wherein the annular inner cylinder (18) is sleeved on the outer periphery of the casing (2) in the combustion chamber through a first connecting assembly, and the annular inner cylinder (18) is a visible structure; An annular outer cylinder (12) is sleeved on the outer circumference of the annular inner cylinder (18); An annular head (11) connecting the front end of the annular inner cylinder (18) and the front end of the annular outer cylinder (12); The annular inner cylinder (18), the annular head (11) and the annular outer cylinder (12) are all provided with mixing holes.

4. The reflow combustion chamber with a visual optical observation structure according to claim 3, characterized in that: The first connection component comprises: A pressure plate (19) is arranged at the rear end of the annular inner cylinder (18), and the pressure plate (19) is slidably matched with the casing (2) in the combustion chamber; A gland (21) connected to a casing cover plate (22) in the combustion chamber; An elastic member (20) is connected to the pressing plate (19) after passing through the pressing cover (21) and the elastic member (20) via a connecting member; The rear end of the annular outer cylinder (12) is slidably connected to the inner end cover assembly.

5. The reflow combustion chamber with a visual optical observation structure according to claim 3, characterized in that: A plurality of nozzles are arranged along the circumference of the combustion chamber outer casing (3), each nozzle is arranged to penetrate the combustion chamber outer casing (3) and the annular outer cylinder (12), and the nozzle opening of the nozzle is located in the inner cavity of the annular flame cylinder.

6. The reflow combustion chamber using a visual optical observation structure according to any one of claims 1 to 5, characterized in that: The inner observation window (27) and the outer observation window (30) are both fan-shaped, and the fan-shaped angle is greater than or equal to a preset angle.

7. The reflow combustion chamber using a visual optical observation structure according to any one of claims 1 to 5, characterized in that: The first observation window further comprises flexible pads arranged on both sides of the first observation window (24), and / or, The inner window assembly further comprises flexible gaskets arranged on both sides of the inner observation window (27), and / or the outer window assembly further comprises flexible gaskets arranged on both sides of the outer observation window (30).

8. The reflow combustion chamber using a visual optical observation structure according to any one of claims 1 to 5, characterized in that: There are a plurality of the first observation windows and a plurality of the second observation windows, the plurality of first observation windows are arranged along the circumference of the combustion chamber casing (2), and the positions of the plurality of second observation windows correspond one-to-one to the positions of the plurality of first observation windows.

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