Combustion chamber structure and methods for its manufacture

Abstract

Combustion chamber structure (10), comprising: - an inner shell (12) surrounding a combustion chamber (14) with an outer surface facing away from the combustion chamber (14), on which coolant channels (16) extending in a longitudinal direction of the inner shell (12) are formed, - an outer jacket (22) that surrounds the inner jacket (12) at least partially in such a way that the coolant channels (16) are covered and fluidically isolated from each other, wherein an inner surface of the outer sheath (22) facing the inner sheath (12) is formed by a wire (24) wound circumferentially around the inner sheath (12) with wire turns (28) adjacent to one another in the longitudinal direction of the inner sheath (12), and wherein the adjacent wire turns (28) are connected to one another by means of a material bond, characterized by the fact that the wire (24) is made of a material which has a lower coefficient of thermal expansion than the material of which the inner sheath (12) is made, and that the circumferentially wound wire (24) forms two (26, 27) or more winding layers, wherein adjacent winding layers (26, 27) of the two or more winding layers are connected to each other by means of a material bond.

Description

[0001] The disclosure relates to a combustion chamber structure, particularly for a rocket engine, and comprises an inner shell surrounding a combustion chamber with an outer surface facing away from the combustion chamber, on which coolant channels extending longitudinally along the inner shell are formed, and an outer shell that surrounds the inner shell, at least partially, such that the coolant channels are covered and fluidically isolated from one another. In principle, the combustion chamber structure is applicable not only to the specific application of rocket engines but also to other fields such as aircraft construction. The disclosure further relates to a method for manufacturing such a combustion chamber structure.

[0002] The continuous combustion process in the combustion chamber of a rocket engine generates very high temperatures, typically exceeding 3000°C, and very high pressures, typically more than 150 bar. Therefore, the combustion chamber structure must be designed to withstand these high temperatures and pressures.

[0003] Typically, combustion chamber structures for this purpose feature a highly thermally conductive inner liner, made, for example, of a copper alloy, with numerous coolant channels on its outer surface, and an outer jacket that seals the coolant channels and absorbs most of the mechanical forces acting on the combustion chamber structure during operation. The coolant can be a cryogenic fuel such as liquid hydrogen. The heat of reaction released during combustion in the combustion chamber to the highly thermally conductive inner liner is transferred to the coolant in the cooling channels and carried away by it. This cooling process is called regenerative cooling. The coolant, heated in this way, can then be directed into the combustion chamber for combustion after exiting the cooling channels.The outer casing is typically made of nickel and is electroplated. Distributors may be welded to the outer casing to distribute the coolant to the coolant channels and collect it again from the coolant channels.

[0004] Such combustion chamber structures are typically manufactured by producing the inner shell, for example from a copper alloy, in one piece, forming ribs on the outside of the inner shell by mechanical machining, which then form the coolant channels, filling the spaces between the ribs with wax, electroplating the outer shell, which is typically made of nickel, and then melting out the wax contained in the spaces between the ribs of the inner shell.

[0005] Such a combustion chamber is known from DE 103 50 735 A.

[0006] Such a covering of the cooling channels by means of an electroplated coating is a very complex and therefore costly process due to the wax insertion and wax removal process.

[0007] US Patent 3,120,101 A discloses a combustion chamber whose inner shell has a multitude of longitudinally extending cooling channels on its outer surface. A strip of high-strength material is wound around the cooling channels to form an outer shell. The strip has a brazing alloy on its surface contacting the cooling channels, by which the strip forming the outer shell is attached to the inner shell by melting the brazing alloy.

[0008] In a combustion chamber known from US 9 835 114 B1, rows of material enclosing the cooling channels to the outside form the outer shell of the combustion chamber.

[0009] DE 10 2016 212 314 A1 relates to a combustion chamber structure in which bent sections of a plurality of cooling channel webs form a fluid-tight covering of the cooling channels.

[0010] A combustion chamber structure must be specified that meets the requirements for temperature resistance and is also cost-effective to manufacture.

[0011] According to the invention, a combustion chamber structure with the features of claim 1, a method for producing a combustion chamber structure with the features of claim 5 and a method for producing a combustion chamber structure with the features of claim 10 are specified.

[0012] The disclosed combustion chamber structure comprises an inner shell surrounding a combustion chamber, with an outer surface facing away from the combustion chamber on which coolant channels extending longitudinally along the inner shell are formed, and an outer shell that surrounds the inner shell at least partially in such a way that the coolant channels are covered and fluidically isolated from one another. An inner surface of the outer shell facing the inner shell is formed by a wire wound circumferentially around the inner shell, with wire turns adjacent to one another longitudinally along the inner shell. The adjacent wire turns are connected to one another by means of a material bond.

[0013] The inner jacket is made of a thermally conductive material. Furthermore, the inner jacket material should be compatible with the fuels used and possess sufficient strength. The inner jacket can be made of, for example, a steel or copper alloy. The raw part of the inner jacket can be a forged body whose outer contour is turned. The coolant channels formed on the outer surface of the inner jacket, for example, by coolant channel ribs, can be created by machining, such as milling the inner jacket material. A coolant flowing through these channels allows the heat of reaction released to the inner jacket during the combustion process to be absorbed by the coolant and dissipated away from the combustion chamber structure.The coolant used can be either a fuel or an oxidizer, which is heated in this way and can then be fed into the combustion chamber.

[0014] To guide the coolant through the coolant channels, the outer jacket surrounds the inner jacket, at least partially, in such a way that the coolant channels are covered and fluidically isolated from one another. At least one layer of the outer jacket facing the inner jacket, which covers the coolant channels and forms an inner surface of the outer jacket facing the inner jacket, is formed by a wound wire. The wire is wound circumferentially around the inner jacket, forming wire turns that are adjacent to each other along the length of the inner jacket and constitute at least one winding layer. The adjacent wire turns are connected by a material bond. This at least one winding layer then forms the layer of the outer jacket facing the inner jacket. With multiple winding layers, winding is typically done layer by layer.The fluidic insulation of the coolant channels from each other and from the outside is achieved through the metallurgical bonding of adjacent wire coils. Typical materials for the wire used include copper, steel, or aluminum, both in pure form and alloyed.

[0015] Since the area of ​​the outer jacket immediately adjacent to the coolant channels is not electroplated, the very complex wax injection process into the coolant channels prior to the electroplating of the outer jacket and the equally complex wax removal process from the coolant channels after electroplating are eliminated. Instead, the outer jacket adjacent to the coolant channels is produced primarily through mechanical processing steps and subsequent bonding. The disclosed combustion chamber structure can therefore be manufactured relatively cost-effectively while simultaneously ensuring the necessary cooling efficiency.

[0016] In a further development process, the metal bond is formed by means of a solder material surrounding the wire. The wire used for wrapping is thus surrounded by a solder material and is, for example, a solder-coated wire. The metal bond can therefore be easily achieved after wrapping the inner sheath with wire by melting the solder and subsequently allowing it to solidify. In principle, any soldering method is suitable. Soldering methods carried out in a protective gas atmosphere or in a vacuum are preferred. For example, the soldering process can take place in a soldering furnace or be inductive soldering.

[0017] In a combustion chamber structure according to the invention, the wire is made of a material that has a lower coefficient of thermal expansion than the material of the inner sheath. This ensures that during the thermal step of soldering, in which the solder material is melted and the wire and inner sheath are also heated, the greater expansion of the inner sheath compared to the wire generates an additional preload force, preventing the wire windings from loosening. It is advantageous if the difference between the coefficients of thermal expansion of the wire material and the inner sheath material is not too large.

[0018] In one embodiment, which serves only to better understand the invention and is not part of the invention itself, the circumferentially wound wire can form only one winding layer. The adjacent wire turns of this single winding layer are then metallurgically bonded to one another as described above, thus forming a fluidically tight covering for the coolant channels.

[0019] According to the invention, the circumferentially wound wire forms two or more winding layers. These two or more winding layers then form a mechanically stable cover for the coolant channels. The two or more winding layers are preferably wound sequentially, i.e., layer by layer. In this embodiment of the invention, the adjacent winding layers of the two or more winding layers are connected by means of a material bond, thus forming a fluidically tight and mechanically stable cover for the coolant channels.

[0020] In a further refinement, the outer casing features an outer shell that surrounds the circumferentially wound wire with wire turns adjacent to each other along the longitudinal axis of the inner casing. In this refinement, in addition to the layer formed by the wound wire that covers the coolant channels, an outer shell is provided that surrounds and encloses the wound wire from the outside. The outer casing then comprises the wound wire and the additional outer shell. The outer shell provides additional mechanical stability to the outer casing and thus further stiffens the entire combustion chamber structure. The outer shell can, for example, be designed to bear a large portion of the mechanical loads acting on the outer casing during operation of the combustion chamber structure. The wire winding layer then primarily serves a covering and sealing function.The outer shell can be designed in virtually any way. It can be mechanically connected to the wound wire, forming a bonded structure, or it can be not mechanically connected to the wound wire, forming a non-bonded structure. It can be metallic or non-metallic. For example, it can be formed by two half-shells that are joined together. The two half-shells can be soldered to the wound wire. Alternatively, the half-shells can be screwed to the wound wire. The outer shell can also be created, for example, by wrapping the layer covering the coolant channels, formed by the wound wire, with fiber-reinforced plastic. Furthermore, the outer shell can be created by applying a coating material using a metal spraying process.

[0021] The outer shell may also have been formed by electroplating a layer. Since the coolant channels are already covered by the layer formed from wound wire, the spaces between them do not need to be filled with wax before the electroplating layer is applied; the electroplating layer can be applied directly.

[0022] In an alternative embodiment to the further development with the outer shell described above, the outer sheath is formed solely from wire wound circumferentially around the inner sheath, with wire windings adjacent to one another and bonded together longitudinally along the inner sheath. In this alternative embodiment, the load-bearing function of the outer sheath is performed exclusively by the wound wire. The outer sheath has no additional load-bearing structure beyond the wire winding.

[0023] Furthermore, a method for manufacturing a combustion chamber structure must be specified, which allows a combustion chamber structure to be produced in a simple and therefore cost-effective manner that meets the requirements for temperature resistance.

[0024] The disclosed method for manufacturing a combustion chamber structure having an inner shell surrounding a combustion chamber and on whose outer surface facing away from the combustion chamber coolant channels are formed, comprises the step of forming an outer shell that surrounds the inner shell at least partially in such a way that the coolant channels are covered and fluidically isolated from one another, by wrapping the inner shell circumferentially with a wire, so that at least one winding layer extending in the longitudinal direction of the inner shell is formed with immediately adjacent wire turns, and subsequent metallurgical joining of the wire of immediately adjacent wire turns.

[0025] In the described process, an outer sheath covering the coolant channels is not applied electroplated, as in prior art methods, but rather by wrapping the inner sheath with a wire, which is then bonded to form a closed layer. This eliminates the time-consuming and production-related process of introducing wax into the coolant channels and subsequently melting it out.

[0026] In a further development of the process, the wire is surrounded by a solder material, and the metallurgical bond between the immediately adjacent wire windings is achieved by melting and subsequently solidifying the solder material. In this further development, the metallurgical bond between the wire windings is thus created solely by a thermal process, namely soldering.

[0027] In a further development of the process, the winding of the inner sheath with the wire begins at a point on the inner sheath with the smallest diameter. Starting the winding from this point or area has the advantage that, during the winding process, the wire turns in the area of ​​the inner sheath with a larger diameter can be supported by the already wound wire turns in the area of ​​the inner sheath with a smaller diameter, resulting in a gap-free winding.

[0028] The disclosed method can be carried out in such a way that only one winding layer is formed, but according to the invention, two or more winding layers are formed. In this case according to the invention, two or more winding layers extending in the longitudinal direction of the inner sheath are formed with immediately adjacent wire turns, and subsequently, in addition to the metallurgical bond of the wire of immediately adjacent wire turns of one winding layer, immediately adjacent winding layers of the two or more winding layers are joined together by means of a metallurgical bond. Two or more winding layers offer the advantage that they provide a layer with increased mechanical stiffness compared to a layer consisting of only one winding layer.

[0029] To ensure that the outer shell possesses the necessary stiffness and mechanical strength, the disclosed method may additionally include the application of an outer shell to the at least one winding layer extending longitudinally along the inner shell during the formation of the outer shell. As described above, there are no restrictions on the design of the outer shell, as long as it withstands the high temperatures and pressures encountered during operation of the combustion chamber structure.

[0030] In an alternative method, the outer sheath can be formed solely from wire wound circumferentially around the inner sheath, with wire turns directly adjacent to one another and bonded together longitudinally along the inner sheath. The necessary stiffness to fulfill the load-bearing function of the outer sheath can, in this case, be achieved, for example, by the number of winding layers and the material of the wire used.

[0031] Further advantages, details, and features of the solution described here will become apparent from the following description of exemplary embodiments and from the figures. These show: Fig. 1 in a schematic side view an embodiment of a method for manufacturing a combustion chamber structure in which the inner shell with coolant channels formed on the outside is wrapped with a wire to form an outer shell; Fig. 2 schematically in a top view a cross-section through a combustion chamber structure with an outer shell which according to the in Fig. is produced using the method shown in 1; Fig. 3a schematically in a cutaway side view a combustion chamber structure, the outer shell of which is designed according to the in Fig. 1 is produced using the method shown, wherein the wound wire forms a winding layer; Fig. 3b schematically shows a combustion chamber structure in a cutaway side view, the outer shell of which is designed according to the one in Fig. 1 is produced according to the method shown, wherein the wound wire forms two winding layers; Fig. 4a schematically shows a cross-section in a top view through a combustion chamber structure whose outer shell has an outer casing; and Fig. 4b schematically in a cutaway side view which is in Fig. 4a shown combustion chamber structure with outer shell.

[0032] The one in Fig. The combustion chamber structure 10 shown in Figure 1 has an inner shell 12 that surrounds a combustion chamber 14. The inner shell 12 has coolant channels 16 on its outer surface facing away from the combustion chamber, which are located in the Fig. 2 can be seen. The coolant channels 16 run longitudinally along the inner shell 12 and serve to guide a coolant along the outside of the inner shell 12, which absorbs the heat of reaction released to the inner shell 12 during the combustion process and conducts it away from the combustion chamber structure 10. The coolant channels 16 are typically formed by coolant channel webs. An outer boundary of a coolant channel 16 is in Fig. 1 schematically indicated by reference numeral 21. The inner shell 12 has a region 18 with a minimum diameter, from which, in each case, the following extend with respect to Fig. 1. Upwards and downwards, i.e., in the longitudinal direction of the inner mantle 12, areas 20 of the inner mantle 12 with a larger diameter are connected. The area 18 with the minimum diameter forms a combustion chamber neck. The structure described so far corresponds to known combustion chamber structures. The longitudinal direction of the inner mantle 12 is in the Fig. 1 indicated by arrows.

[0033] In the Fig. Figure 1 schematically illustrates how an outer shell 22 of the disclosed combustion chamber structure 10 can be formed. According to the disclosed method, the inner shell 12 is wound with a wire 24. The wire 24 is wound circumferentially around the inner shell 12, forming a winding layer 26 in which adjacent wire turns 28 are as close together as possible, i.e., wound with as few gaps as possible. The winding layer 26 extends longitudinally around the inner shell 12, and adjacent wire turns 28 of the winding layer 26 abut each other longitudinally around the inner shell 12. To form a winding layer 26, the wire 24 is wound circumferentially around the inner shell 12 such that the wire 24 does not overlap, extends longitudinally, and the winding is as gap-free as possible.

[0034] This involves the in Fig. The process shown in section 1 begins with the wire winding in the area 18 with the smallest diameter, i.e., at the combustion chamber neck. Starting from there, the wire 24 is wound with respect to Fig. The wire 24 is wound upwards, creating a winding layer 26 that extends longitudinally upwards from the combustion chamber neck. Starting from the combustion chamber neck, the wire 24 (the same wire or a different wire) is wound downwards, so that the winding layer 26 extends further downwards longitudinally from the combustion chamber neck.

[0035] According to the method described above, a layer is formed that surrounds the inner jacket 12. The inner jacket 12 can be completely surrounded by the layer, or only partially surrounded by the layer of wire winding. Preferably, however, the area of ​​the inner jacket 12 on whose outer surface the coolant channels 16 are formed is surrounded by the layer of wire winding. The coolant channels 16 should therefore be covered by the wound layer.

[0036] Once the area of ​​the inner sheath 12 that is to be covered by the wire winding is covered, adjacent wire turns 28 of the wire winding layer 26 are then joined together in a further process step. In the process described here, the wire 24 with the actual wire material is surrounded by a solder material, and the wire surrounded by solder is soldered. This creates a material bond between adjacent wire turns 28, resulting in a fluidically tight covering for the coolant channels 16. In other words, the wire winding and the subsequent material bonding of the wire winding create a closed covering for the coolant channels 16.

[0037] The Fig. Figure 2 shows a cross-section through the combustion chamber structure 10 after Fig. 1, after wrapping with wire 24 and joining wire 24 with a material bond. As in the Fig. As can be seen in Figure 2, the coolant channels 16 formed on the outer surface are fluidically sealed off from each other and from the outside by a layer 30. The layer was formed by the Fig. 1 described procedure formed.

[0038] The described procedure can be carried out in such a way that, as also with regard to Fig. 1 is described and in Fig. 3a shows that a winding layer 26 is formed and adjacent wire turns 28 of the winding layer 26 are subsequently soldered together to form the closed layer 30.

[0039] The described method can also be carried out in such a way that two or more winding layers are formed. Fig. Figure 3b shows an example with two winding layers 26, 27. If two or more winding layers are provided, the material bond can also be formed between the individual winding layers lying on top of each other. This is shown in Fig. Figure 3b shows the case of two winding layers 26, 27. The two winding layers 26, 27 lie essentially without gaps on top of each other and form the closed layer 30. The two winding layers 26, 27 are wound one after the other, i.e., layer by layer.

[0040] A winding starting from the point or area 18 with the smallest diameter of the inner sheath 12 has the advantage that, during winding, the wire windings in area 20 of the inner sheath 12 with a larger diameter can support themselves on the already wound wire windings in the area of ​​the inner sheath 12 with a smaller diameter, resulting in a gap-free winding.

[0041] If the wire 24 is made of a material that has a lower coefficient of thermal expansion than the coefficient of thermal expansion of the material from which the inner sheath 12 is formed, an additional preload force is generated during the soldering process, which keeps the wire windings under tension on the inner sheath and counteracts loosening of the wire windings.

[0042] The disclosed method may include a further process step for forming the outer shell 22 of the combustion chamber structure 10. Specifically, it is provided, as in the Fig. 4a and Fig.Figure 4b shows that the layer 30 formed by the wire winding, which covers and seals the coolant channels 16, is surrounded by an outer shell 32. The outer shell 32 can be constructed in any known manner. For example, it can be formed by two half-shells surrounding the wire winding, it can be made of fiber-reinforced plastic, or it can be produced by a metal injection molding process or by electroplating a layer. The outer shell 32 can be made of any suitable material capable of withstanding the mechanical forces during operation of the combustion chamber structure and the high temperatures.

[0043] The outer shell 32 is typically designed to bear most of the mechanical loads acting on the outer shell during operation of the combustion chamber structure, while the cover formed by the wire winding is primarily designed to seal the coolant channels fluidically.

[0044] Alternatively, it is also possible that the outer casing 22 does not have an additional outer shell beyond the covering of the coolant channels 16 by the wire winding, but that the actual load-bearing structure is also provided by the winding layers. This is typically achieved by a corresponding multi-layered or multi-layered winding of the wire 24. The necessary stiffness can also be achieved by selecting a suitable material for the wire winding. Typical materials for the wire used are copper, steel, and aluminum, both in pure form and alloyed.

[0045] The combustion chamber structure 10 produced by the described method thus has an outer shell 22 that fluidically seals the coolant channels 16 of the inner shell 12. An inner surface of the outer shell 22 facing the inner shell 12 is formed by a wire 24 wound circumferentially around the inner shell 12, with adjacent wire turns 28 running lengthwise along the inner shell 12. The adjacent wire turns 18 are metallurgically bonded together by a soldered connection. The wire winding layer 30 covering the coolant channels 16, which forms the inner surface of the outer shell 22 facing the inner shell 12, can be formed by a single winding layer 26 or by two or more winding layers 26, 27. The layer 30 fluidically seals the coolant channels 16.The layer 30 can be designed in such a way that it alone carries the load-bearing function of the outer shell 22, or in addition to the layer 30 an outer shell 32 surrounding the layer 30 is provided, which is also part of the outer shell 22 and is designed in such a way that it carries a large part or part of the mechanical loads of the outer shell 22 in the operation of the combustion chamber structure 10.

[0046] The described process enables the cost-effective production of a combustion chamber structure that simultaneously exhibits the necessary high cooling efficiency. In this process, the coolant channels are covered by simple mechanical steps (winding) followed by thermal treatment of the winding (soldering). The conventional electroplating of the coolant channels, which involves significant production effort due to wax injection and melting, is eliminated in this process, thus reducing the manufacturing costs of the combustion chamber structure.

Claims

[1] Combustion chamber structure (10) comprising: - an inner shell (12) surrounding a combustion chamber (14) with an outer surface facing away from the combustion chamber (14), on which coolant channels (16) are formed running in a longitudinal direction of the inner shell (12), - an outer shell (22) which surrounds the inner shell (12) at least in regions such that the coolant channels (16) are covered and fluidically insulated from one another, wherein an inner surface of the outer sheath (22) facing the inner sheath (12) is formed by a wire (24) wound in the circumferential direction of the inner sheath (12) with wire windings (28) adjoining one another in the longitudinal direction of the inner sheath (12), and wherein the adjoining wire windings (28) are connected to one another by means of a material bond, characterized by , that the wire (24) is formed from a material which has a lower thermal expansion coefficient than the material from which the inner sheath (12) is formed, and in that the circumferentially wound wire (24) forms two (26, 27) or more winding layers, wherein adjacent winding layers (26, 27) of the two or more winding layers are connected to one another by means of a material bond. [2] Combustion chamber structure (10) according to claim 1, wherein the material bond is formed by means of a solder material surrounding the wire (24). [3] Combustion chamber structure (10) according to one of the preceding claims, wherein the outer casing (22) has an outer shell (32) which surrounds the circumferentially wound wire (24) with wire windings (28) which are adjacent to one another in the longitudinal direction of the inner casing (12) and are connected to one another in a materially bonded manner. [4] Combustion chamber structure (10) according to one of claims 1 or 2, wherein the outer shell (22) is formed only from the wire (24) wound in the circumferential direction of the inner shell (12) with wire windings (28) adjoining one another and connected to one another in a materially bonded manner in the longitudinal direction of the inner shell (12). [5] A method for producing a combustion chamber structure (10), wherein the combustion chamber structure (10) has an inner shell (12) which surrounds a combustion chamber (14) and on the outer surface of which coolant channels (16) are formed facing away from the combustion chamber (14), comprising: - forming an outer shell (22) which surrounds the inner shell (12) at least in regions such that the coolant channels (16) are covered and fluidically insulated from one another, by a) wrapping the inner sheath (12) in the circumferential direction of the inner sheath (12) with a wire (24) so ​​that at least one winding layer (26) extending in the longitudinal direction of the inner sheath (12) is formed with directly adjacent wire windings (28), and then b) materially connecting the wire (24) of immediately adjacent wire windings (28), wherein the wire (24) is formed from a material having a lower thermal expansion coefficient than the material from which the inner sheath (12) is formed, and wherein in step a) two or more winding layers (26, 27) extending in the longitudinal direction of the inner sheath (12) are formed with wire windings (28) directly adjacent to one another, and subsequently in step b), in addition to the material connection of the wire (24) of immediately adjacent wire turns (28) of a winding layer (26; 27), immediately adjacent winding layers of the two or more winding layers (26, 27) are connected to one another by means of a material connection. [6] Method for producing a combustion chamber structure (10) according to claim 5, wherein the wire (24) is surrounded by a solder material, and wherein the material connection of the wire (24) of the immediately adjacent wire turns (28) is effected by melting and subsequent solidification of the solder material. [7] Method for producing a combustion chamber structure (10) according to claim 5 or 6, wherein the wrapping of the inner shell (12) with the wire (24) is started at a point of the inner shell (12) with the smallest diameter. [8] A method of manufacturing a combustion chamber structure (10) according to any one of claims 5 to 7, wherein the step of forming the outer shell (22) additionally comprises: - Applying an outer shell (32) to the at least one winding layer (26) extending in the longitudinal direction of the inner sheath (12). [9] Method for producing a combustion chamber structure (10) according to one of claims 5 to 7, wherein the outer shell (22) is formed only from the wire (24) wound in the circumferential direction of the inner shell (12) with wire windings (28) directly adjacent to one another and connected to one another in a materially bonded manner in the longitudinal direction of the inner shell (12). [10] A method for producing a combustion chamber structure (10), wherein the combustion chamber structure (10) has an inner shell (12) surrounding a combustion chamber (14) and on the outer surface of which coolant channels (16) are formed facing away from the combustion chamber (14), comprising: - forming an outer shell (22) which surrounds the inner shell (12) at least in regions such that the coolant channels (16) are covered and fluidically insulated from one another, by a) winding the inner sheath (12) in the circumferential direction of the inner sheath (12) with a wire (24) starting at a point on the inner sheath (12) with the smallest diameter in the direction of a point on the inner sheath (12) with the largest diameter, so that at least one winding layer (26) extending in the longitudinal direction of the inner sheath (12) with directly adjacent wire turns (28) is formed, and subsequently b) materially connecting the wire (24) of immediately adjacent wire windings (28).

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