CN113074387B - Regenerative cooling channel with truss structure - Google Patents
Regenerative cooling channel with truss structure Download PDFInfo
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- CN113074387B CN113074387B CN202110474971.XA CN202110474971A CN113074387B CN 113074387 B CN113074387 B CN 113074387B CN 202110474971 A CN202110474971 A CN 202110474971A CN 113074387 B CN113074387 B CN 113074387B
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- truss structure
- cooling channel
- wall
- cavity
- combustion chamber
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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
- F23R3/60—Support structures; Attaching or mounting means
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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
- F23R2900/00—Special features of, or arrangements for continuous combustion chambers; Combustion processes therefor
- F23R2900/03043—Convection cooled combustion chamber walls with means for guiding the cooling air flow
Abstract
The application discloses a regenerative cooling channel with a truss structure, which comprises an outer wall, the truss structure and a cooling channel; a cavity is arranged between the outer wall and the cooling channel, and the truss structure is arranged in the cavity. The truss structure comprises a hollow frame structure formed by building a plurality of support rods. The truss structure comprises a plurality of mutually connected foundation units, and the foundation units are supporting bodies built by a plurality of supporting rods; any two adjacent base units share one side in the longitudinal and transverse directions. The basic unit is a quadrangular pyramid body consisting of four triangles and a square. The invention constructs the air interlayer by utilizing the truss structure on the basis of the traditional regenerative cooling structure, isolates a large amount of heat by utilizing the low heat conduction characteristic of air, avoids overhigh temperature of the outer wall of the combustion chamber, and effectively reduces the structural weight of the wall surface of the combustion chamber while ensuring the structural strength.
Description
Technical Field
The application relates to the technical field of ramjet combustion chambers, in particular to a regenerative cooling channel with a truss structure.
Background
The hypersonic aircraft propelled by the ramjet engine is a research and development hotspot problem in the aerospace field in recent years, the extremely high pneumatic thermal load caused by the hypersonic Mach number and the extremely high temperature generated by combustion of a hydrocarbon fuel propellant exceed the bearing capacity of the existing material, and one of the keys of designing the hypersonic aircraft is to solve the thermal protection problem of the aircraft, in particular the cooling problem of a combustion chamber of the ramjet engine. The conventional turbine-based engine adopts cooling methods such as impact and air film, and the ramjet engine has extremely high incoming flow stagnation temperature, so that the conventional air cooling method and a regenerative cooling scheme are difficult to use. Regenerative cooling is a cooling method commonly used in ramjet engines, and usually uses liquid fuel used by the engine itself as a cooling medium. The liquid fuel flows in the cooling channel inside the wall surface of the high-temperature component in the reverse direction with the external high-temperature gas, and absorbs heat through forced convection heat exchange, so that the temperature of the wall surface is reduced. When the liquid fuel leaves the high-temperature part, on one hand, the high-temperature part is cooled, and on the other hand, the liquid fuel enters the combustion chamber at a higher temperature, so that the energy regeneration is realized.
At present, a conventional regenerative cooling structure mostly adopts a double-wall-surface internal-clamping flow path mode, a cooling groove is milled on an inner wall surface, and an outer wall surface is connected with the inner wall surface in a welding mode to form a cooling channel. This structure mainly has the following disadvantages: on one hand, because fuel oil has a coking risk, a flow passage in the traditional regenerative cooling structure is not too flat, the space utilization rate in the wall surface thickness direction is not good, and a large amount of weight reduction space is still left; on the other hand, the metal material with a large thermal conductivity coefficient in the thickness direction occupies a large proportion, so that the equivalent thermal resistance in the direction is small, and the heat insulation capability needs to be improved.
Disclosure of Invention
It is an object of the present application to overcome the above problems or to at least partially solve or mitigate the above problems.
According to one aspect of the present application, there is provided a regenerative cooling channel with a truss structure, comprising an outer wall, a truss structure and a cooling channel;
a cavity is arranged between the outer wall and the cooling channel, and the truss structure is arranged in the cavity.
Optionally, the truss structure comprises a hollow frame structure built up from a plurality of support rods.
Optionally, the truss structure comprises a plurality of interconnected base units, the base units being support bodies built up from a plurality of support rods; any two adjacent base units share one side in the longitudinal and transverse directions.
Optionally, the base unit is a quadrangular pyramid composed of four triangles and one square.
Optionally, the inner side of the cooling channel forms an inner cavity of the combustion chamber, and a plurality of medium flow channels are uniformly arranged on the outer side of the cooling channel along the circumferential direction.
Optionally, the cross-sectional shape of the media flow channel is rectangular, circular, semicircular, or triangular.
Optionally, air is provided within the cavity.
Optionally, the cooling channel and the truss structure are made of a high-temperature alloy material with high temperature resistance and high strength.
Optionally, the superalloy material is a superalloy GH3536, and/or the truss structure is integrally formed by using an additive manufacturing technology.
Optionally, the flow direction of the cooling medium in the medium flow channel is opposite to the flow direction of the gas in the combustion chamber cavity.
By adopting the technical scheme of the invention, the invention has the following beneficial effects:
1. according to the regenerative cooling channel provided by the invention, the engine propellant with the corresponding type is used as the cooling medium in the medium flow channel of the internal regenerative cooling channel and flows in the reverse direction of the high-temperature air flow in the combustion chamber to cool the inner wall of the cooling channel, the air interlayer in the external truss structure forms larger equivalent thermal resistance, and a large amount of heat is effectively isolated by utilizing the low heat conduction characteristic of the air interlayer, so that the overhigh temperature of the outer wall of the combustion chamber is avoided.
2. The air interlayer formed between the outer wall and the cooling channel is supported by a high-reliability truss structure, so that the connection strength is ensured, the weight reduction requirement of the wall surface of the combustion chamber is effectively met, and the reliability of the arrangement scheme of the regenerative cooling channel is ensured.
3. The cross section of the medium flow passage of the cooling channel can be selected from various shapes, the size and the arrangement form of the truss structure are various, the combination can be optimized according to the heat exchange requirement, and the scheme has flexibility.
The above and other objects, advantages and features of the present application will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the present application will be described in detail hereinafter by way of illustration and not limitation with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
FIG. 1 is a schematic structural view of a regenerative cooling channel with a truss structure provided herein;
FIG. 2 is a side cross-sectional view of a regenerative cooling channel with a truss structure provided herein;
fig. 3 is a schematic structural view of a truss structure provided herein.
The labels in the figure are:
1-outer wall;
2-truss structure, 20 support rods, 21 basic units, 22 sides and 23 triangles; 24 squares;
3-cooling channel, 30 medium flow channel.
Detailed Description
Referring to fig. 1 and 2, a regenerative cooling channel with a truss structure includes an outer wall 1, a truss structure 2, and a cooling channel 3;
a cavity is arranged between the outer wall 1 and the cooling channel 3, and a truss structure 2 is arranged in the cavity.
The truss structure 2 is positioned in a cavity between the outer wall 1 and the cooling channel 3, not only has the supporting and connecting effect on the inner wall and the outer wall, but also forms the cavity to reduce the weight of the structure. The invention is used for thermal protection of the combustion chamber wall surface of the hydrocarbon fuel ramjet engine, and can meet the requirements of reducing the structural weight and enhancing the heat insulation capability of the combustion chamber wall surface of the current hypersonic aircraft.
Referring to fig. 3, the truss structure 2 comprises a hollow frame structure built up from a plurality of support rods 20.
The truss structure can be a hollow frame structure, the frame structure plays a supporting role, and a heat insulation interlayer is formed in the frame structure to play a role in preventing heat and protecting the outer wall from overheating.
Preferably, the truss structure 2 includes a plurality of interconnected foundation units 21, the foundation units 21 being support bodies built up by a plurality of support bars 20; any two adjacent base units 21 share one side 22 in the longitudinal and transverse directions.
No matter in vertical and horizontal direction, every basic unit 21 all shares an edge 22 with adjacent basic unit 21, and the truss structure that sets up like this has guaranteed the stability of truss structure again when guaranteeing that truss structure plays fine supporting role.
Preferably, the base unit 21 is a quadrangular pyramid consisting of four triangles 23 and one square 24. The base units 21 are closely arranged in the axial direction and the circumferential direction, each base unit 21 shares one side with an adjacent base unit in the longitudinal direction and the transverse direction, and the vertex of the support body in each base unit 21 is formed by converging eight sides. The base units 21 are provided with cavities, the cavities are formed among the base units 21, and air with low heat conductivity is filled in the cavities to serve as a heat insulation interlayer.
The inner side of the outer wall of the invention is connected with one end of a truss structure 2, and forms an air interlayer with the outer side of a cooling channel 3, and the outer side of the outer wall is used as the outer surface of a combustion chamber; the other end of the truss structure 2 is connected with the outer side of the cooling channel 3, and air with a smaller heat conductivity coefficient can be filled in a cavity between the outer wall 1 and the cooling channel 3, so that the effect of increasing the equivalent thermal resistance in the thickness direction of the regenerative cooling channel is achieved, forced convection heat exchange cannot be achieved, heat which should be taken away by a cooling medium is isolated, the outer wall 1 is prevented from being transmitted, and the temperature of the outer wall 1 is effectively reduced.
Further, the inner side of the cooling passage 3 forms an inner cavity of the combustion chamber, and a plurality of medium flow passages 30 are uniformly arranged in the circumferential direction on the outer side of the cooling passage 3.
Preferably, the sectional shape of the medium flow passage 30 is rectangular, circular, semicircular or triangular. The cross-sectional shape of the media flow path 30 shown in fig. 3 is rectangular.
Furthermore, the cooling channel 3 and the truss structure 2 are made of high-temperature alloy materials with high temperature resistance and high strength. The preferred superalloy material is superalloy GH 3536.
Preferably, the truss structure 2 is manufactured by adopting an additive manufacturing technology through integral forming, compared with the existing regenerative cooling channel design scheme which adopts a welding mode, a more complex design structure is constructed, structural failure and thermal contact resistance which are possibly caused by welding are avoided, and the bottleneck of a heat transfer optimization technology of the traditional regenerative cooling structure is broken through.
Further, in order to sufficiently perform heat exchange, the flow direction of the cooling medium in the medium flow passage is opposite to the flow direction of the gas in the combustion chamber inner chamber.
The using method of the invention is as follows:
the low-temperature cooling medium enters the medium flow channel 30 of the cooling channel 3 through an opening at one end of the cooling channel 3, the specific flow direction depends on the installation position and the direction of the invention, but the flow direction of the cooling medium in the medium flow channel 30 needs to be ensured to be opposite to the main flow direction of the high-temperature gas in the inner cavity of the combustion chamber, so as to enhance the forced convection heat exchange effect.
The invention constructs the air interlayer by utilizing the truss structure on the basis of the traditional regenerative cooling structure, isolates a large amount of heat by utilizing the low heat conduction characteristic of air, avoids overhigh temperature of the outer wall of the combustion chamber, and effectively reduces the structural weight of the wall surface of the combustion chamber while ensuring the structural strength.
It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which this application belongs.
In the description of the present application, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present application.
Furthermore, the terms "first", "second", etc. 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. In the description of the present application, "a plurality" means two or more unless specifically defined otherwise.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
The above description is only for the preferred embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (5)
1. A regenerative cooling channel with a truss structure comprises an outer wall, the truss structure and a cooling channel;
a cavity is arranged between the outer wall and the cooling channel, and the truss structure is arranged in the cavity;
the truss structure comprises a hollow frame structure built by a plurality of support rods;
the truss structure comprises a plurality of mutually connected foundation units, and the foundation units are supporting bodies built by a plurality of supporting rods; in the longitudinal direction and the transverse direction, any two adjacent basic units share one edge;
the inner side of the cooling channel forms an inner cavity of the combustion chamber, and a plurality of medium flow channels are uniformly arranged on the outer side of the cooling channel along the circumferential direction;
air is arranged in the cavity;
the flow direction of the cooling medium in the medium flow channel is opposite to the flow direction of the gas in the inner cavity of the combustion chamber.
2. The regenerative cooling passage with truss structure as claimed in claim 1, wherein the base unit is a quadrangular pyramid composed of four triangles and one square.
3. The regenerative cooling channel with truss structure as claimed in claim 1 or 2, wherein the cross-sectional shape of the medium flow channel is rectangular, circular, semicircular or triangular.
4. The regenerative cooling channel with a truss structure as defined in claim 3, wherein the material of the cooling channel, the truss structure and the outer wall is a high temperature alloy material with high temperature resistance and high strength.
5. The regenerative cooling channel with the truss structure as claimed in claim 4, wherein the high temperature alloy material is high temperature alloy GH3536, and/or the truss structure is integrally formed by using additive manufacturing technology.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110474971.XA CN113074387B (en) | 2021-04-29 | 2021-04-29 | Regenerative cooling channel with truss structure |
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| CN202110474971.XA CN113074387B (en) | 2021-04-29 | 2021-04-29 | Regenerative cooling channel with truss structure |
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| CN113074387A CN113074387A (en) | 2021-07-06 |
| CN113074387B true CN113074387B (en) | 2022-02-25 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113483354B (en) * | 2021-07-16 | 2023-07-07 | 西北工业大学 | Bent truss structure heat shield for afterburner and method for forming air film |
| CN113565652B (en) * | 2021-07-27 | 2022-08-19 | 中国人民解放军国防科技大学 | Multilayer fixed high-temperature fluid channel |
| CN114156504B (en) * | 2021-11-25 | 2023-09-22 | 西北工业大学 | Heat exchange cooling device and heat exchange cooling method between hydrogen fuel cell and air compressor |
| CN116160204B (en) * | 2023-04-17 | 2023-06-23 | 中国空气动力研究与发展中心超高速空气动力研究所 | Optimized manufacturing method of hypersonic high-temperature wind tunnel water-cooling heat insulation device |
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