DE102018111570B4 - Combustion chamber structure and method for its manufacture - Google Patents

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) are formed running in a longitudinal direction of the inner shell (12),
- an outer jacket (22) which surrounds the inner jacket (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 in 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.

Description

The disclosure relates to a combustion chamber structure, in particular 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 in the longitudinal direction of the inner shell are formed, and an outer shell that surrounds the inner shell at least in regions such that the coolant channels are covered and fluidically isolated from one another. In addition to the specific application of rocket engines, the combustion chamber structure is generally also applicable to other fields, such as aircraft construction. The disclosure further relates to a method for producing such a combustion chamber structure.

In a rocket engine's combustion chamber structure, the continuous combustion process creates very high temperatures, typically over 3000°C, and very high pressures, typically more than 150 bar. A combustion chamber structure must therefore be designed to withstand these high temperatures and pressures.

For this purpose, combustion chamber structures typically have a highly thermally conductive inner liner, made from a copper alloy, for example, and featuring a multitude of coolant channels on its exterior. An outer jacket, called a jacket, seals the coolant channels and bears a large portion of the mechanical forces acting on the combustion chamber structure during operation. The coolant can be a cryogenic fuel such as liquid hydrogen. The reaction heat released during combustion in the combustion chamber to the highly thermally conductive inner liner is transferred to the coolant in the cooling channels and transported away by it. This type of cooling process is called regenerative cooling. The heated coolant can exit the cooling channels and be directed into the combustion chamber for combustion. The outer jacket is typically made of nickel and is electroplated. Distributors can be welded onto the outer jacket to distribute the coolant to the coolant channels and collect it from the coolant channels.

Such combustion chamber structures are usually manufactured by manufacturing 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 a 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.

Such a combustion chamber is from the DE 103 50 735 A known.

Such a covering of the cooling channels by means of a galvanically applied coating is a very complex and therefore cost-intensive process due to the wax introduction and lost wax casting process.

From the US 3 120 101 A A combustion chamber is known whose inner shell has a plurality of longitudinally extending cooling channels on its outer side. A band of high-strength material is wound around the cooling channels to form an outer shell. The band has a brazing alloy on its surface contacting the cooling channels, by means of which the band forming the outer shell is attached to the inner shell by melting the brazing alloy.

In one of the US 9 835 114 B1 known combustion chamber of the form rows of the cooling channels to the outside closing material the outer shell of the combustion chamber.

The 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 cover of the cooling channels.

A combustion chamber structure must be specified that meets the requirements for temperature resistance and can also be manufactured cost-effectively.

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

The disclosed combustion chamber structure comprises an inner shell surrounding a combustion chamber, having an outer surface facing away from the combustion chamber, on which coolant channels extending in a longitudinal direction of the inner shell are formed, and an outer shell that surrounds the inner shell at least in regions such 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 in the circumferential direction of the inner shell, with wire windings adjacent to one another in the longitudinal direction of the inner shell. The adjacent wire windings are connected to each other by means of a material bond.

The inner jacket is made of a heat-conducting material. The material of the inner jacket should also be compatible with the fuels used and have sufficient strength. The inner jacket can be made of steel or a copper alloy, for example. The blank 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, which are formed, for example, by coolant channel webs, can be produced by mechanical processing such as milling the inner jacket material. By guiding a coolant in the coolant channels, the reaction heat released to the inner jacket during the combustion process can be absorbed by the coolant and conducted 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 to the combustion chamber.

To guide the coolant in the coolant channels, the outer jacket surrounds the inner jacket at least in sections so that the coolant channels are covered and fluidically insulated 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 in the circumferential direction of the inner jacket, thus forming wire turns that adjoin one another in the longitudinal direction of the inner jacket and form at least one winding layer in the longitudinal direction of the inner jacket. The adjacent wire turns are connected to one another by means of a material bond. The 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 material bond of the wire between adjacent wire turns results in the fluidic insulation of the coolant channels from one another and from the outside. Typical materials for the wire used include copper, steel, or aluminum, both pure and alloyed.

Since the area of the outer shell directly adjacent to the coolant channels is not electroplated, the very complex wax introduction process into the coolant channels prior to electroplating the outer shell and the very complex lost-wax removal process from the coolant channels after electroplating the outer shell are eliminated. Instead, the outer shell adjacent to the coolant channels is manufactured through essentially mechanical processing steps and the subsequent bonding. The disclosed combustion chamber structure can thus be manufactured comparatively cost-effectively while simultaneously ensuring the necessary cooling efficiency.

In a further development, the bond is formed by a solder material surrounding the wire. The wire used for the wrapping is thus surrounded by a solder material and is, for example, a wire coated with solder. The bond can thus be easily achieved after the inner sheath has been wrapped with wire by melting the solder and then allowing it to solidify. In principle, any soldering process is suitable. Soldering processes that operate 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.

In a combustion chamber structure according to the invention, the wire is formed from a material that has a lower thermal expansion coefficient than the material from which the inner sheath is formed. This makes it possible to achieve that during the thermal soldering step, in which the solder material is melted and in which the actual wire and the inner sheath are also heated, an additional prestressing force is generated due to the greater expansion of the inner sheath compared to the wire, which prevents the wire windings from loosening. It is advantageous if the difference between the thermal expansion coefficients of the wire material and the inner sheath material is not too great.

In an embodiment that merely serves to better understand the invention and is not part of the invention, the circumferentially wound wire can form only one winding layer. The adjacent wire turns of this one winding layer are then integrally connected to one another as described above, thus forming a fluid-tight cover for the coolant channels.

According to the invention, the wire wound in the circumferential direction forms two or more winding layers. The two or more winding layers then form a mechanically stable cover for the coolant channels. The two or more winding layers are preferably wound one after the other, i.e. layer by layer. In this embodiment according to the invention, the adjacent winding layers of the two or more winding layers are connected by means of a material bond and thus form a fluidically tight and mechanically stable cover for the coolant channels.

In a further development, the outer jacket has an outer shell that surrounds the circumferentially wound wire with adjacent wire windings in the longitudinal direction of the inner jacket. In this further development, in addition to the layer covering the coolant channels, which is formed by the wound wire, an outer shell is provided that surrounds and thus encloses the wound wire from the outside. The outer jacket then comprises the wound wire and the additional outer shell. The outer shell provides additional mechanical stability for the outer jacket and thus additional 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 jacket during operation of the combustion chamber structure. The wire winding layer then primarily has a covering and sealing function. The outer shell can, in principle, be designed in any desired manner. It can be mechanically connected to the wound wire, thus forming a connected structure, or it can be mechanically unconnected to the wound wire, thus forming a non-connected 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 connected to the wound wire by a solder joint. Alternatively, the half-shells can be connected to the wound wire by a screw connection. The outer shell can also be formed, for example, by wrapping fiber-reinforced plastic around the layer covering the coolant channels, which is formed by the wound wire. Furthermore, the outer shell can be formed, for example, by applying a covering material using a metal spraying process.

The outer shell can also be formed by electroplating a layer. Since the coolant channels are already covered by the layer formed from wound wire, the gaps do not need to be filled with wax before applying the electroplating layer; instead, the electroplating layer can be applied directly.

In an alternative embodiment to the above-described refinement with the outer shell, the outer sheath is formed solely from the wire wound in the circumferential direction of the inner sheath, with wire windings adjacent to one another in the longitudinal direction of the inner sheath and connected to one another by a material bond. In this alternative embodiment, the load-bearing function of the outer sheath is assumed solely by the wound wire. The outer sheath has no additional load-bearing structure beyond the wire winding.

Furthermore, a method for producing a combustion chamber structure is to be specified, with which a combustion chamber structure can be produced in a simple and thus cost-effective manner which meets the requirements for temperature resistance.

The disclosed method for producing a combustion chamber structure having an inner shell surrounding a combustion chamber and having coolant channels formed on the outer surface thereof facing away from the combustion chamber comprises the step of forming an outer shell surrounding the inner shell at least in regions such that the coolant channels are covered and fluidically insulated from one another by winding a wire around the inner shell in the circumferential direction of the inner shell so that at least one winding layer extending in the longitudinal direction of the inner shell with directly adjacent wire turns is formed, and then materially connecting the wire of directly adjacent wire turns.

In the described process, an outer jacket covering the coolant channels is not applied electroplated, as in prior art processes, but rather by wrapping the inner jacket with a wire, which is then bonded together to form a continuous layer. This eliminates the time-consuming and costly process of introducing wax into the coolant channels and subsequently melting out the wax.

In a further development of the process, the wire is surrounded by a solder material, and the bonding of the wire windings directly adjacent to one another is achieved by melting and then solidifying the solder material. In this further development, the bonding between the wire windings is thus achieved solely by a thermal process, namely soldering.

In a further development of the method, the winding of the inner sheath with the wire is started at a point on the inner sheath with the smallest diameter. Starting the winding from the point or area with the smallest diameter of the inner sheath has the advantage that during the winding, the wire windings in the area of the inner sheath with a larger diameter are placed on the already wound wire windings in the area of the inner sheath with a smaller diameter and a gap-free winding is created.

Although the disclosed method can be carried out in such a way that only one winding layer is formed, 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 directly adjacent wire turns. Subsequently, in addition to the integral connection of the wire of directly adjacent wire turns of a winding layer, directly adjacent winding layers of the two or more winding layers are connected to one another by means of an integral bond. Two or more winding layers offer the advantage of providing a layer with increased mechanical rigidity compared to a layer consisting of only one winding layer.

To ensure that the outer shell has the necessary rigidity and mechanical strength, the step of forming the outer shell in the disclosed method can additionally include applying an outer shell to the at least one winding layer extending in the longitudinal direction of the inner shell. As described above, there are no restrictions on the design of the outer shell as long as it can withstand the high temperatures and pressures encountered during operation of the combustion chamber structure.

In an alternative process, the outer sheath can be formed solely from the wire wound in the circumferential direction of the inner sheath, with the wire windings directly adjacent to each other in the longitudinal direction of the inner sheath and firmly bonded together. In this case, the necessary stiffness to fulfill the load-bearing function of the outer sheath can be achieved, for example, by adjusting the number of winding layers and the material of the wire used.

• 1 in einer schematischen Seitenansicht ein Ausführungsbeispiel eines Verfahrens zur Herstellung einer Brennkammerstruktur, bei dem der Innenmantel mit auf der Außenseite gebildeten Kühlmittelkanälen zur Bildung eines Außenmantels mit einem Draht umwickelt wird;
• 2 schematisch in einer Draufsicht einen Querschnitt durch eine Brennkammerstruktur mit einem Außenmantel, der gemäß dem in 1 gezeigten Verfahren hergestellt ist;
• 3a schematisch in einer geschnittenen Seitenansicht eine Brennkammerstruktur, deren Außenmantel gemäß dem in 1 gezeigten Verfahren hergestellt wird, wobei der gewickelte Draht eine Wicklungslage bildet;
• 3b schematisch in einer geschnittenen Seitenansicht eine Brennkammerstruktur, deren Außenmantel gemäß dem in 1 gezeigten Verfahren hergestellt wird, wobei der gewickelte Draht zwei Wicklungslagen bildet;
• 4a schematisch in einer Draufsicht einen Querschnitt durch eine Brennkammerstruktur, deren Außenmantel eine Außenschale aufweist; und
• 4b schematisch in einer geschnittenen Seitenansicht die in 4a gezeigte Brennkammerstruktur mit Außenschale.

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:

• 1 in a schematic side view, an embodiment of a method for producing 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;
• 2 schematically in a plan view a cross-section through a combustion chamber structure with an outer shell, which according to the in 1 is manufactured using the method shown;
• 3a schematically in a sectional side view a combustion chamber structure, the outer shell of which is constructed according to the 1 shown method, wherein the wound wire forms a winding layer;
• 3b schematically in a sectional side view a combustion chamber structure, the outer shell of which is constructed according to the 1 shown method, wherein the wound wire forms two winding layers;
• 4a schematically shows a plan view of a cross-section through a combustion chamber structure whose outer casing has an outer shell; and
• 4b schematically in a sectional side view the 4a shown combustion chamber structure with outer shell.

The 1 The combustion chamber structure 10 shown has an inner shell 12 which surrounds a combustion chamber 14. The inner shell 12 has, on its outer surface facing away from the combustion chamber, coolant channels 16 which are arranged in the 2 can be seen. The coolant channels 16 run in a longitudinal direction of the inner shell 12 and serve to guide a coolant along the outside of the inner shell 12, which coolant absorbs the reaction heat 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 shown in 1 schematically indicated by the reference numeral 21. The inner casing 12 has a region 18 with a minimum diameter, from which 1 Upwards and downwards, i.e. in the longitudinal direction of the inner shell 12, regions 20 of the inner shell 12 with a larger diameter connect. The region 18 with the minimum diameter forms a combustion chamber throat. The structure described so far corresponds to known combustion chamber structures. The longitudinal direction of the inner shell 12 is in the 1 indicated by arrows.

In the 1 is schematically shown 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 in the circumferential direction of the inner shell 12, so that a winding layer 26 is formed in which adjacent wire turns 28 have the smallest possible distance from one another, i.e. are wound as gap-free as possible. The winding layer 26 extends in a longitudinal direction of the inner shell 12, and adjacent wire turns 28 of the winding layer 26 border in the longitudinal direction of the inner sheath 12 to one another. To form a winding layer 26, the wire 24 is wound around the inner sheath 12 in the circumferential direction of the inner sheath 12 in such a way that the wire 24 does not overlap, extends in the longitudinal direction, and the winding is as gap-free as possible.

In this case, the 1 In the method shown, the wire winding begins 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 1 wound upwards, forming a winding layer 26 that extends longitudinally upwards from the combustion chamber neck. Starting at the combustion chamber neck, the wire 24 (the same wire or a different wire) is wound downwards, forming a winding layer 26 that extends further downwards from the combustion chamber neck.

According to the method described above, a layer is formed that surrounds the inner casing 12. The inner casing 12 can be completely surrounded by the layer, or only partially surrounded by the wire winding layer. However, it is preferred that the wire winding layer surround the area of the inner casing 12 on whose outer surface the coolant channels 16 are formed. The coolant channels 16 should therefore be covered by the wound layer.

Once the area of the inner sheath 12 that is to be covered by the wire winding is covered by the wire winding, adjacent wire windings 28 of the wire winding layer 26 are then bonded together in a further process step. In the process described here, the wire 24 and the actual wire material are surrounded by a solder material, and the wire surrounded by the solder material is soldered. This creates a bond between adjacent wire windings 28, creating a fluid-tight cover for the coolant channels 16. In other words, the wire winding and the subsequent bonding of the wire winding create a closed cover for the coolant channels 16.

The 2 shows a cross section through the combustion chamber structure 10 according to 1 , after wrapping with the wire 24 and bonding the wire 24. As shown in the 2 As can be seen, the coolant channels 16 formed on the outer surface are covered fluidically tight between each other and to the outside by a layer 30. The layer was covered by the 1 described procedures.

The described method can be carried out in such a way that, as also with regard to 1 is described and in 3a is shown, a winding layer 26 is formed and adjacent wire turns 28 of the one winding layer 26 are then soldered to form the closed layer 30.

The described method can also be carried out in such a way that two or more winding layers are formed. 3b An example with two winding layers 26, 27 is shown. 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 3b for the case of two winding layers 26, 27. The two winding layers 26, 27 lie essentially one above the other without any gaps and form the closed layer 30. The two winding layers 26, 27 are wound one after the other, i.e. layer by layer.

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 the area 20 of the inner sheath 12 with a larger diameter can be supported on the already wound wire windings in the area of the inner sheath 12 with a smaller diameter and a gap-free winding is created.

If a material is used for the wire 24 which has a lower thermal expansion coefficient than the thermal expansion coefficient of the material from which the inner sheath 12 is formed, an additional pretensioning force is generated during the soldering process, which keeps the wire windings in tension on the inner sheath and counteracts loosening of the wire windings.

The disclosed method may include a further method step for forming the outer shell 22 of the combustion chamber structure 10. Specifically, as shown in the 4a and 4b It can be seen that the layer 30 formed by the wire winding and covering and sealing the coolant channels 16 is surrounded by an outer shell 32. The outer shell 32 can be designed 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; but it can also be produced by a metal spraying process or by galvanically depositing a layer. The outer shell 32 can be made of any suitable material capable of bearing the mechanical forces during operation of the combustion chamber structure and withstanding the high temperatures.

The outer shell 32 is typically intended to carry a large part 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 intended to fluidically seal the coolant channels.

Alternatively, it is also possible for the outer jacket 22 to have no additional outer shell to cover the coolant channels 16 with the wire winding, but rather for the actual load-bearing structure to be provided by the winding layers. This is typically achieved by a corresponding multi-layer or multi-layer winding of the wire 24. The necessary rigidity 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 and alloyed form.

The combustion chamber structure 10 produced by the described method thus has an outer shell 22 that covers the coolant channels 16 of the inner shell 12 in a fluid-tight manner. An inner surface of the outer shell 22 facing the inner shell 12 is formed by a wire 24 wound in the circumferential direction of the inner shell 12 with wire windings 28 adjacent to one another in the longitudinal direction of the inner shell 12. The adjacent wire windings 18 are integrally connected to one another by the soldered connection. The layer 30 of wire winding covering the coolant channels 16, which has the inner surface of the outer shell 22 facing the inner shell 12, can be formed by one winding layer 26 or by two or more winding layers 26, 27. The layer 30 covers the coolant channels 16 in a fluid-tight manner. The layer 30 can be designed such 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 such that it carries a large part or part of the mechanical loads of the outer shell 22 during operation of the combustion chamber structure 10.

The described process enables the cost-effective production of a combustion chamber structure that simultaneously exhibits the necessary high cooling efficiency. In the described process, the covering of the coolant channels is achieved through simple mechanical steps (winding) and subsequent thermal treatment of the winding (soldering). The conventional galvanic covering of the coolant channels, which entails high production costs due to the introduction of wax and the melting of wax, is eliminated in the described process, thus reducing the manufacturing costs of the combustion chamber structure.

Claims (10)

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 outer surface coolant channels (16) extending in a longitudinal direction of the inner shell (12) are formed, - 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 shell (22) facing the inner shell (12) is formed by a wire (24) wound in the circumferential direction of the inner shell (12) with wire windings (28) adjoining one another in the longitudinal direction of the inner shell (12), and wherein the adjoining wire windings (28) are connected to one another by means of a material bond, characterized in that the wire (24) is formed from a material having a lower thermal expansion coefficient than the material from which the inner shell (12) is made. is formed, and that the wire (24) wound in the circumferential direction 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. Combustion chamber structure (10) according to Claim 1 , wherein the material bond is formed by means of a solder material surrounding the wire (24). 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. Combustion chamber structure (10) according to one of the Claims 1 or 2 , wherein the outer sheath (22) is formed only from the wire (24) wound in the circumferential direction of the inner sheath (12) with wire windings (28) adjoining one another and connected to one another in the longitudinal direction of the inner sheath (12). 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, facing away from the combustion chamber (14), coolant channels (16) are formed, comprising: - forming an outer jacket (22) which surrounds the inner jacket (12) at least in regions such that the coolant channels (16) are covered and fluidically insulated from one another, by a) winding a wire (24) around the inner jacket (12) in the circumferential direction of the inner jacket (12), so that at least one winding layer (26) extending in the longitudinal direction of the inner jacket (12) with directly adjacent wire turns (28) is formed, and subsequently b) materially connecting the wire (24) of directly adjacent wire turns (28), wherein the wire (24) is formed from a material which has a lower thermal expansion coefficient than the material from which the inner jacket (12) is formed, and wherein in step a) two or more winding layers (26, 27) extending in the longitudinal direction of the inner jacket (12) with directly adjacent wire windings (28) are formed, and then in step b) in addition to the material connection of the wire (24) of immediately adjacent wire windings (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. 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 windings (28) is effected by melting and subsequent solidification of the solder material. Method for producing a combustion chamber structure (10) according to Claim 5 or 6 , wherein the winding of the inner sheath (12) with the wire (24) is started at a point of the inner sheath (12) with the smallest diameter. Method for producing a combustion chamber structure (10) according to one of the Claims 5 until 7 , wherein the step of forming the outer sheath (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). Method for producing a combustion chamber structure (10) according to one of the Claims 5 until 7 , wherein the outer sheath (22) is formed only from the wire (24) wound in the circumferential direction of the inner sheath (12) with wire windings (28) directly adjacent to one another and materially connected to one another in the longitudinal direction of the inner sheath (12). 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) surrounding 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 a wire (24) around the inner shell (12) in the circumferential direction of the inner shell (12), starting at a point on the inner shell (12) with the smallest diameter in the direction of a point on the inner shell (12) with the largest diameter, so that at least one winding layer (26) extending in the longitudinal direction of the inner shell (12) with directly adjacent wire turns (28) is formed, and subsequently b) firmly connecting the wire (24) from directly adjacent wire windings (28).