SYSTEM FOR DISSOLVING NUCLEI IN COMPOSITE PARTS

Abstract

The invention relates to a system (6) for dissolving nuclei (58) in composite parts (50), the dissolution system (6) comprising: - a tank (60) filled with a nucleus (58) dissolution liquid, and - a carousel (62) located in the tank (60) and configured to carry composite parts (50) having nuclei (58) to be dissolved, the carousel (62) being rotatable about an axis (A) and the composite parts (50) being intended to be arranged around this axis (A) and immersed in said dissolution liquid. Figure 6 (for the abstract)

Description

Title of the invention: SYSTEM FOR DISSOLVING NUCLEI IN COMPOSITE PARTS Technical field of the invention

[0001] The invention relates to the field of nucleus dissolution systems in composite parts.

[0002] The invention also relates to an installation comprising such a dissolution system and composite parts containing cores to be dissolved, as well as a method for dissolving cores in composite parts implemented using this installation. Technical background

[0003] To produce a part, in particular in composite with alveoli (or in other words cavities or hollow cells), it is known to use fusible or soluble nuclei.

[0004] The term "fusible core" or "soluble core" refers to a part (for example, made of salt) onto which a material, particularly a composite material, is formed. This core is intended to disappear, for example through a dissolution system, to form one of the cells composing the final part.

[0005] By way of example, document WO-A1-2021123628 describes fusible or soluble cores for manufacturing thrust reverser grids from composite material for an aircraft turbomachine. To this end, the document describes placing, in a suitable mold, a core corresponding to each cell of a reverser grid, and then performing thermocompression to form an intermediate part containing the cores. At the end of this thermocompression step, the cores remain trapped in the intermediate part. After demolding this intermediate part, the cores must then be removed to obtain the desired final part with the cells.

[0006] It is known to immerse the molded intermediate part in a water tank to remove the cores, particularly those dissolved in salt. However, melting the core can be a lengthy process, and the water in the tank can quickly become saturated. Furthermore, the quantity of water used in the tank, which can exceed 100 liters, is significant. This water, saturated with dissolved core particles, is treated as chemical waste due to the presence of salt.

[0007] An oscillating motion can be added to the tank to allow water to mix and to accelerate salt erosion. However, the time required for the cores to melt may still be long.

[0008] The nuclei can also be removed by a pressurized water jet system. This reduces the melting time of the nuclei, but the volume of water required to remove them is even greater.

[0009] In these different contexts, it is advantageous to propose a solution that optimizes the dissolution time of the nuclei and reduces the volume of water and waste generated during the dissolution of these nuclei in composite parts. Summary of the invention

[0010] The invention offers a simple, effective and economical solution to the aforementioned disadvantages of the prior art.

[0011] To this end, according to a first aspect, the invention relates to a system for dissolving nuclei in composite parts, the dissolution system comprising: - a tank filled with a liquid for dissolving kernels, and - a carousel located in the tank and configured to carry composite parts having cores to be dissolved, the carousel being mobile in rotation around an axis A and the composite parts being intended to be arranged around this axis A and immersed in said dissolving liquid.

[0012] The dissolution system of the invention generally makes it possible to significantly reduce the dissolution time of the cores contained in the composite parts and to minimize both the volume of dissolution liquid required and the waste generated during dissolution.

[0013] Indeed, the rotation of the carousel generates centrifugal forces. These forces create currents of the dissolution liquid (or vortices) which erode the cores in the composite parts into several dissolved particles. These particles detach from the composite parts to form the cells of the final composite parts.

[0014] Furthermore, the rotation of the carousel also ensures a homogenous saturation of dissolved nuclei particles in the tank. This increases the quantity of dissolved particles in the tank's dissolution liquid. In this way, waste generation is reduced, as is the volume of dissolution liquid required in the system of the invention.

[0015] The dissolution system according to the invention may comprise one or more of the following features, taken individually or in combination with each other:

[0016] - the system also includes a settling tank which is located under the tank and which is configured to collect dissolved particles from nuclei;

[0017] - the system includes at least one filter located between the tank and the settling tank and configured to retain dissolved particles of nuclei in the settling tank;

[0018] - the tank further comprises one or more channels configured to convey dissolved particles of nuclei from the tank to the settling tank;

[0019] - the system includes a pump filtration device comprising a reservoir of collection of dissolved particles from the nuclei, a first tube and a second tube connected to the tank, the first tube forming an inlet for the dissolution liquid and the second tube forming an outlet for the dissolution liquid with the dissolved particles towards the reservoir;

[0020] - the carousel includes at least one fin configured to be interposed between two adjacent composite parts configured to stir the dissolving liquid;

[0021] - the system includes a device for heating the dissolving liquid;

[0022] - the carousel includes a rotating platform and a central column that extends from the rotating platform upwards along axis A, longitudinal grooves for fixing the composite parts are provided in the central column;

[0023] - the rotating platform includes at its outer periphery an annular rim oriented towards the side of said central column;

[0024] - the system includes a retention device which is fixed on one end peripheral of the central column and which is configured to cover said composite parts;

[0025] - the dissolving liquid is water or water-based.

[0026] The invention also relates, according to a second aspect, to an installation comprising a nucleus dissolution system according to one of the features of the invention, and composite parts, in particular aeronautical, carried by the carousel and arranged around the axis A.

[0027] The installation according to the invention may comprise one or more of the following features, taken individually or in combination with each other:

[0028] - the composite parts are flat and each extends substantially in a plane radial with respect to axis A;

[0029] - the composite parts are grids, such as thrust reverser grids of an aircraft turbomachine, these grids comprising cells filled by the nuclei to be dissolved;

[0030] - the nuclei are salt-based, for example comprising a mixture of nitrate of sodium, potassium nitrate and zirconium silicate;

[0031] dissolution for the purpose of dissolving the nuclei

[0032] The invention also relates, according to a third aspect, to a method for dissolving nuclei in composite parts, this method being implemented using an installation according to one of the features of the inventions. This method comprises a step of rotating the carousel and the composite parts in the liquid of the dissolution with a view to dissolving the nuclei. Brief description of the figures

[0033] The present invention will be better understood and other details, features and advantages of the present invention will become more apparent upon reading the description of a non-limiting example that follows, with reference to the accompanying drawings in which:

[0034] [Fig. 1] is a schematic perspective view of a nacelle of an aircraft propulsion assembly comprising a thrust reverser having a plurality of composite parts in the form of a grid according to the invention,

[0035] [Fig.2] is a partial schematic and perspective view of an example of the composite part of [Fig.1],

[0036] [Fig.3] represents a flowchart of a manufacturing process for the composite part of [Fig.2],

[0037] Figure 4 illustrates in perspective and schematically a sheet with long discontinuous fibers of a first fibrous reinforcement according to the invention,

[0038] [Fig.5] is a schematic representation of an assembly step of the spar and blade preforms of the manufacturing process of [Fig.3],

[0039] [Fig.6] is a schematic and perspective view of an installation according to an embodiment of the invention, comprising a core dissolution system and composite parts of [Fig.2],

[0040] [Fig.7] is a schematic and axial cross-sectional view of the installation of [Fig.6],

[0041] Fig. 8 is a schematic and perspective view of an installation according to another embodiment of the invention, comprising the core dissolution system, composite parts of [Fig.2] and fins,

[0042] [Fig.9] is a schematic and perspective view of an installation according to another embodiment of the invention, comprising a nucleus dissolution system, an external filtration device and composite parts of [Fig.2],

[0043] [Fig. 10] is a schematic and perspective view of a retention device for the dissolution system of the invention, and

[0044] [Fig.1 1] is a flowchart of a process for dissolving nuclei in composite parts.

[0045] Elements having the same functions in the different embodiments have the same references in the figures. Detailed description of the invention

[0046] By convention, in the description below, the terms "longitudinal" and "axial" refer to the orientation of structural elements extending along the direction of a longitudinal axis (such as that of a turbomachine). The terms "radial" or "vertical" refer An orientation of structural elements extending in a direction perpendicular to the longitudinal axis. The terms "interior" and "exterior," and "internal" and "external," are used with reference to positioning relative to the longitudinal axis. Thus, a structural element extending along the longitudinal axis has an interior face facing the longitudinal axis and an exterior surface opposite its interior surface.

[0047] Similarly, by convention in the present application, the terms "upstream" and "downstream" are defined with respect to the direction of gas flow in the turbomachine of an aircraft propulsion unit.

[0048] The invention applies in a non-limiting way to an aircraft propulsion assembly 10. The [Fig.1] this aircraft propulsion assembly 10 comprising a turbomachine 3 which is surrounded by a nacelle 1.

[0049] The propulsion unit 10 can be suspended from a fixed structure of an aircraft, for example under a wing or on a fuselage, by means of a pylon 2 (or mast) attached to the turbomachine 3 or to the nacelle 1 in the case of the example in [Fig.1].

[0050] The turbomachine 3 can be a double-flow turbomachine which includes, from upstream to downstream (according to the direction of gas flow), a blower, one or more compressors), a combustion chamber, one or more turbine(s), which define a flow path of a primary flow (called hot air flow).

[0051] The nacelle 1 can extend along a longitudinal axis X.

[0052] The nacelle 1 may include, from upstream to downstream, an upstream inlet section 4 of air, a mid-section (not visible in [Fig. 1]), a downstream section housing a thrust reverser 5 and possibly a terminal nozzle section. The sections of the nacelle 1 are connected to each other so as to extend around the turbomachine 3 and define around it an annular flow channel of a secondary airflow (or cold airflow).

[0053] The thrust reverser 5 may include a plurality of grilles 50 for forming an airflow deflection device (in particular, for the flow of cold air). These grilles 50 may be movably connected to an external cover 52 of the thrust reverser. The grilles 50 may be pivotally mounted between a closed position (direct jet) in which these grilles 50 are substantially parallel to the X-axis, and an open position (reverse jet) in which these grilles 50 are inclined with respect to the X-axis. [Fig. 1] illustrates the thrust reverser 5 in the open position so as to expose the grilles 50.

[0054] The nacelle 1 may comprise various parts and / or components that can be made of composite materials. In particular, the grids 50 of the thrust reverser 5 can each be made of composite material. Of course, the invention applies generally to all parts made of composite material having cells (or (in other words, hollow cavities or cells) and in various fields in which these parts allow for the transmission of forces, a reduction in mass while being economical.

[0055] Figure 2 illustrates a part made of composite material 50, in particular aeronautical material. The composite part 50 can form one of the grids 50 described above and can therefore be intended to be assembled in the thrust reverser 5 of the nacelle 1.

[0056] The composite part 50 may include a fibrous reinforcement embedded in a matrix. In particular, the composite part 50 includes cells 52 that can form a honeycomb structure. Each cell 52 is delimited by several walls 54, 56 forming a parallelepiped, as shown in [Fig. 2]. The cells 52 may, however, have cross-sections with other shapes such as hexagonal, circular, or triangular. As can be seen in [Fig. 2], the walls 54, 56 also allow the cells 52 to be separated from one another.

[0057] The composite part 50 of [Fig. 2] allows, in particular, the production of thrust reverser grids 5 intended to be installed in the thrust reverser 5 of the nacelle 1. In the case of the thrust reverser grids 5, the composite part 50 may comprise first walls 54 forming spars that perform the support function and second walls 56 forming bladed elements (also referred to as blades) that help to direct an airflow in the turbomachine. The spars and the bladed elements extend longitudinally, respectively, in two substantially perpendicular directions and thus form the contours of the cells 52. Thus, the first walls 54 extend along the X-axis (of the nacelle 1) and the second walls 56 extend along a Y-axis perpendicular to the X-axis.

[0058] The composite part 50 as described above may be a thermoplastic, thermosetting, carbon fiber, or glass fiber composite. The thermoplastic composite part 50 may be made of a material selected from polyetherimide (PEI), polyaryletherketones (PAEK), polyphenylene sulfide (PPS), polycarbonate (PC), etc. The thermosetting composite part 50 may be made of epoxy resin 8552 or PR520. The composite part 50 may be made of draped, laminated, or discontinuous long fiber materials.

[0059] In particular, this composite part can be composed of a first fibrous reinforcement with discontinuous long fibers and / or a second fibrous reinforcement with continuous long fibers. The fibrous reinforcements are intended to provide strength to the final part 50, particularly at the walls or junctions of the part. The cells 52 of the part are formed by cores 58 around which the fibrous reinforcements are placed. The fibrous reinforcements are densified by a matrix (for example, a thermoplastic or thermosetting matrix) to obtain the rigid final part with the alveoli 52 (whose respective shapes are obtained by the nuclei 58).

[0060] We will now describe an example of a manufacturing process 100 of such a composite part 50 with reference and in a non-limiting way to thrust reverser grids 5. This process 100 is shown in [Fig.3].

[0061] The process 100 may include a step 102 of supplying a preform of bladed elements 560. This preform of bladed elements 560 may be obtained from a first layer 500 of the first fibrous reinforcement as shown in [Fig. 4]. The first layer 500 may comprise a plurality of discontinuous long fibers that are randomly oriented in all directions within a plane. Discontinuous long fibers are known by the acronym "DLF" for "Discontinuous Long Fiber." The DLF layer 500 comprises, in particular, the fibers and a matrix. In particular, the fibers are pre-impregnated, for example, with a thermoplastic or thermosetting resin.

[0062] The process 100 may include a step 104 of supplying a preform of spars 540. This preform of spars 540 may be obtained from a second layer of the second fibrous reinforcement. This second layer may be continuous long fibers and may be obtained by weaving. This second layer may also be laminated (i.e., formed by stacking layers). In particular, the second layer also comprises fibers and a matrix. The fibers may be pre-impregnated, for example, with a thermoplastic or thermosetting resin.

[0063] The process 100 may include a step 106 of assembling the spar preforms 540 and bladed elements 560 in a mold. With reference to [Fig. 5], a first spar preform 540 is positioned, then a first row of bladed element preforms 560 is positioned by alternating the placement of bladed element preforms 560 and cores 58 (for example, made of salt). Next, a second spar preform 540 (not shown in [Fig.5]) is positioned parallel to the first spar preform 540, then a second row of bladed element preforms 560 is positioned by alternating the placement of bladed element preforms 560 and cores 58. These operations can be repeated as many times as necessary to form all the desired cells 52 of the composite part 50.

[0064] The process 100 may include a step 108 of thermocompression of the spar preforms 540 and bladed elements 560 against the cores 58. This step 108 may be carried out in an autoclave or a press tooling, in which the assembly is brought to a temperature and pressure to compress the preforms 540, 560 by the cores 58 and form the future walls 54, 56 of the composite part 50.

[0065] The process 100 may include a demolding step 110 of the composite part 50 in which the cores 58 remain trapped between the walls 54, 56.

[0066] As described above, after the demolding step 110, it is then necessary to remove the cores 58 to obtain the desired final composite part 50 with the cavities 52.

[0067] The cores 58 may be salt-based. For example, the cores 58 may each comprise a mixture of sodium nitrate, potassium nitrate, and zirconium silicate. The cores 58 are preferably soluble, for example, in water or water-based as the dissolving liquid L.

[0068] The invention thus proposes a dissolution system 6 of nuclei 58 in composite parts 20. The dissolution system 6 will now be described with reference to figures 6 to 10.

[0069] The dissolution system 6 comprises: - a tank 60 filled with a dissolution liquid L of nuclei 58, and - a carousel 62 located in the tank 60 and mobile in rotation around an axis A.

[0070] With reference to Figures 6 to 10, the tank 60 can be cylindrical in shape. The tank 60 can be considered as a static element of the dissolution system 6. The tank 60 can be configured to receive the composite parts 50 with the cores 58 to be dissolved.

[0071] The carousel 62 is configured to carry the composite parts 50 with the cores 58 to be dissolved. The composite parts 50 are configured to be arranged around this axis A and immersed in the dissolving liquid L.

[0072] The dissolving liquid L can be water, water-based or any other liquid allowing the dissolution of nuclei 58 for example based on salt(s).

[0073] The carousel 62 may include a rotating platform 620 and a central column 622. The central column 622 extends upwards from the rotating platform 620 along axis A. The rotating platform 620 and the central column 622 are thus configured to be mobile in rotation about axis A. The direction of rotation is indicated by an arrow in [Fig. 7]. The rotating platform 620 and the central column 622 may be one-piece (i.e., made from a single piece of material).

[0074] The rotating platform 620 can be flat or annular. The rotating platform 620 can extend along an axis B perpendicular to axis A. The rotating platform 620 can include an outer periphery 620a (with respect to axis A). This outer periphery 620a can include a first annular rim 621 (with respect to axis A). The first annular rim 621 can be oriented towards the central column 622. The first annular rim 621 can extend radially beyond the outer periphery 620a. This first annular rim 621 provides a lateral restraint for the composite parts 50 rotating in the carousel 62. The first annular rim 621 thus counteracts centrifugal forces created in the tank 60 during the dissolution of the cores 58.

[0075] The rotating platform 60 may also include an internal annular portion 620b (with respect to axis A) which is integral with the central column 622. This internal annular portion 620b and the central column 622 may be one-piece. The internal annular portion 620b, the central column 622, and the first annular rim 621 may be one-piece.

[0076] With reference to [Fig.7], the central column 622 may comprise an upper portion 622a and a lower portion 622b. The upper portion 622a and the lower portion 622b may be connected to each other by the rotating platform 620. The upper portion 622a and the rotating platform 620 may be located in the tank 60 and the lower portion 622b may be disposed in a settling tank 64 of the dissolution system 6, as illustrated in [Fig.7].

[0077] The central column 622 may include longitudinal grooves 624 extending along axis A. These longitudinal grooves 624 are configured to attach to the composite parts 50 and / or to one or more fins 626.

[0078] The carousel 62 may include at least one fin 626. The fin 626 may have a planar shape (as shown in [Fig. 8]) and may extend along a plane parallel to axis A (or, in other words, a radial plane with respect to axis A). The fin 626 may have a length (measured with respect to axis B) equal to or less than that of the composite part 50. The fin 626 may be fixed in one of the longitudinal grooves 624 or be formed as a single piece with the central column 622 (in particular with the upper portion 622a of the central column 622).

[0079] The fin 626 is configured to be interposed between two adjacent composite parts 50. In this way, the fin 626 stirs the dissolution liquid L. This stirring creates convection currents in the dissolution liquid L and generates more vortices in the tank 60, thus promoting the dissolution of the nuclei 58.

[0080] The dissolution system 6 may include the settling tank 64, which is located below the vessel 60. This settling tank 64 is configured to collect dissolved particles P from the nuclei 58. In this way, the saturation of dissolved particles P in the vessel 60 is reduced. For this purpose, the vessel 60 may include one or more openings 600 located, for example, in a bottom of the vessel 60. This opening 600 allows the dissolved particles P to be discharged into the settling tank 64. The settling tank 64 may be cylindrical in shape. The central column 622, in particular the lower portion 622b, may be arranged in the settling tank 64, as illustrated in [Fig. 7].

[0081] The dissolution system 6 may include one or more channels 68 configured to convey the dissolved particles P from the tank 60 to the settling tank 64. By way of example, these channels 68 may be arranged in one of the side walls 602 of tank 60 as illustrated in [Fig.7]. <

[0082] The dissolution system 6 may include at least one filter 66. This filter 66 may be located between the tank 60 and the settling tank 64. The filter 66 may be located on a mesh portion 660 between the tank 60 and the settling tank 64. In particular, the mesh portion 660 is connected to the lower portion 622b of the central column 622 so as to be preferably disposed of in the settling tank 64. In [Fig. 7], the filter 66 and the mesh portion 660 extend along a plane parallel to axis B. The filter 66 (and consequently the mesh portion) is configured to retain the dissolved particles P in the settling tank 64.

[0083] As an alternative to the filter 66, the dissolution system 6 may include a pump filtration device 67. In particular, this device 67 is external to the tank 62. In this configuration, the settling tank 64 may be optional. With reference to [Fig. 9], the pump filtration device 67 may include a reservoir 670 and two tubes, respectively, first 672 and second 674, connected to the tank 60. The first tube 672 provides an inlet for the dissolution liquid L into the tank 60, and the second tube 674 provides an outlet for the dissolution liquid L from the tank 60 to the reservoir 670 to collect the dissolved particles P. The pump filtration device 67 ensures the movement of the dissolution liquid L and thus filters the dissolved particles P.The external filtration device 67 has the advantage of being easily adaptable to the dissolution system 6 of the invention and that it can be easily disconnected from the dissolution system 6 (for example, to clean it in case of saturation of dissolved particles).

[0084] The dissolution system 6 may include a heating device 7 for heating the dissolution liquid L for its evaporation, for example after complete dissolution of the nuclei 58 of the composite part 50. For this purpose, the heating device 7 may be electric with electric resistances for heating the dissolution liquid L. Alternatively, the heating device 7 may be by induction or by heat transfer fluid.

[0085] The dissolution system 6 may include a retention device 8 configured to envelop and retain, for example, the composite parts 50. An example of a retention device 8 is shown in [Fig. 10], in which the retention device 8 comprises an annular plate 82 and a central tip 84 integral with this annular plate 82. The central tip 84 may pass through axis A. The central tip 84 may be fixed to the central column 622, for example, at an upper end 623 of the upper portion 622a. The annular plate 82 may have a flat shape and extend along a plane parallel to axis B. The annular plate 82 may cover the composite parts 50 and / or at least one fin 626. The retention device 8 may also include a second annular rim 86 (with respect to axis A), by example at the level of an external periphery 80 of the annular plate 82. This second annular rim 86 can be oriented towards the central column 622. The second annular rim 86 can extend radially from an external annular end 820 (relative to axis A) of the annular plate 82. The annular plate 82, the central tip 84 and the second annular rim 86 can be one piece.

[0086] The invention also relates to an installation I comprising the dissolution system 6 described with reference to [Fig. 6] to 10, and the composite parts 50 containing the nuclei 58 to be dissolved. This installation I is illustrated in particular in Figures 6 to 9.

[0087] Composite parts 50, in particular aeronautical, can be grids for example thrust reverser grids 5 described with reference to figures 2 to 5.

[0088] The composite parts 50 can be flat and can each extend substantially in a radial plane with respect to the axis A.

[0089] In installation I, the composite parts 50 are carried by the carousel 62 and arranged around the axis A. In particular, the composite parts 50 are fixed in the longitudinal grooves 624. The composite parts 50 can be retained by the first annular rim 621 and / or the second annular rim 86.

[0090] The installation I may also include one or more fins 626 interposed between two successive composite parts 50.

[0091] The composite parts 50 and / or the fin 626 arranged around the axis A can be mobile in rotation around the axis A.

[0092] We will now describe a process 200 for dissolving cores 58 in composite parts 50. This process 200 can be implemented using the installation I described above. The process 200 is illustrated in [Fig. 11] and also shown in [Fig. 3] at the end of the manufacturing process 100, since the process 200 can be carried out after step 110.

[0093] The process 200 may include a step of rotating 202 the carousel 62 and the composite parts 50 (and / or the fin 226) in the dissolution liquid L to allow the dissolution of the nuclei 58. By way of example, the rotation speed of the carousel 62 may be between 10 revolutions per minute and 60 revolutions per minute.

[0094] The process 200 may include a step 204 of heating the dissolving liquid L. The dissolving liquid L may be heated, for example by the heating system 7, to a predetermined temperature. This predetermined heating temperature may be a maximum of 100°C. For example, the predetermined heating temperature is 70°C.

[0095] This step 204 can be carried out after complete dissolution of the cores 50 of the composite parts 50. This allows in particular the evaporation of the dissolution liquid L at the end of the dissolution process 200. The dissolution system 6 can thus be used again for other composite parts 50 with cores 58 to be dissolved.

Claims

Demands

1. Installation (I) comprising a system for dissolving (6) nuclei (58) in composite parts (50), the dissolution system (6) comprising: - a tank (60) filled with a dissolution liquid (L) for nuclei (58), and - a carousel (62) located in the tank (60) and configured to carry composite parts (50) having nuclei (58) to be dissolved, the carousel (62) being mobile in rotation about an axis (A) and the composite parts (50) being intended to be arranged around this axis (A) and immersed in said dissolution liquid (L), the installation (I) comprising composite parts (50), in particular aeronautical, carried by the carousel (62) and arranged around the axis (A).

2. Installation according to claim 1, characterized in that it also comprises a settling tank (64) which is located under the tank (60) and which is configured to collect dissolved particles (P) from the nuclei (58).

3. Installation according to claim 2, characterized in that it comprises at least one filter (66) located between the tank (60) and the settling tank (64) and configured to retain dissolved particles (P) of nuclei in the settling tank (64).

4. Installation according to claim 2 or 3, characterized in that the tank (60) further comprises one or more channels (68) configured to convey dissolved particles (P) of nuclei from the tank (60) to the settling tank (64).

5. Installation according to claim 1, characterized in that it comprises a pump filtration device (67) including a reservoir (670) for collecting dissolved particles (P) from the nuclei (58), a first tube and a second tube connected to the tank (60), the first tube (672) forming an inlet for the dissolution liquid (L) and the second tube (674) forming an outlet for the dissolution liquid (L) with the dissolved particles (P) towards the reservoir (670).

6. Installation according to any one of the preceding claims, characterized in that the carousel (62) comprises at least one fin (626) configured to be interposed between two adjacent composite parts (50) and configured to stir the dissolving liquid (L).

7. Installation according to any one of the preceding claims, characterized in that it comprises a heating device (7) for the dissolving liquid (L).

8. Installation according to any one of the preceding claims, characterized in that the carousel (62) comprises a rotating platform (620) and a central column (622) which extends from the rotating platform (620) upwards along the axis (A), longitudinal grooves (624) for fixing the composite parts (50) being provided in the central column (622).

9. Installation according to the preceding claim, characterized in that the rotating platform (620) includes at its outer periphery an annular rim (621) oriented towards said central column (622).

10. Installation according to claim 8 or 9, characterized in that it comprises a retention device (8) which is fixed on an upper end (623) of the central column (622) and which is configured to cover said composite parts (50).

11. Installation according to any one of the preceding claims, characterized in that the dissolving liquid (L) is water or water-based.

12. Installation according to any one of the preceding claims, characterized in that the composite parts (50) are flat and each extend substantially in a radial plane with respect to the axis (A).

13. Installation according to any one of the preceding claims, characterized in that the composite parts (50) are grids, such as thrust reverser grids (5) of an aircraft turbomachine (10), these grids comprising cells (52) filled by the nuclei (58) to be dissolved.

14. Installation according to any one of the preceding claims, characterized in that the cores (58) are based on salt(s), for example comprising a mixture of sodium nitrate, potassium nitrate and zirconium silicate.

15. A method for dissolving nuclei (58) in composite parts (50), this method being carried out by means of an installation (I) according to any one of the preceding claims, this method comprising a step of rotating the carousel (62) and the composite parts (50) in the dissolution liquid (L) for the purpose of dissolving the nuclei.

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