摘要：
Heat-exchange and noise attenuation panel 1 for a propulsion assembly (e.g. aircraft gas turbine engine) comprises a cellular structure 3 comprising longitudinally oriented structural walls 32, covered by a perforated plate 2 comprising a plurality of through openings 21. The cavities 31 between the walls 32 define Helmholtz resonators, the through apertures forming necks 21 of the resonators 31. Fluid circulation means 6 (e.g. for oil coolant / lubricant) comprise channels or grooves 6 (6A, 6B, see figures 6B, 7B, 8) formed at least in part in thickened ends of the walls 32 (e.g. flared wall part or bevel 7) on the same side as the perforated plate 2, and/or at least in part in regions of the perforated plate 2, (2A, 2A). The fluid circulation grooves 6 may be covered with attachment elements - inserts 8 or perforated panels (2A, 2A). Preferably the acoustic attenuation system with integrated fluid circulation channels 6 for heat exchange may have a support 4 (e.g. gas turbine air inlet or fan casing), comprise a plurality of honeycomb cellular layers 3 of hexagonal shape (figure 2). Vortices 5 are caused by acoustic waves 11 that move through necks 21, providing viscothermal dissipation.
权利要求：
CLAIMS
1. Heat-exchange and noise-reduction panel (1) for a propulsion assembly, in particular for an aircraft, the panel (1) comprising:
- a perforated plate (2, 2A, 2A") comprising a plurality of through-openings (21), - acellular structure (3) comprising longitudinally oriented structural walls (32) covered by said perforated plate (2, 2A, 2A") and comprising, between said walls (32), cavities (31) that define Helmholtz resonators, said through-openings (21) forming necks of said resonators, and
- means (6) for the circulation of fluid, for example oil, at said perforated plate (2, 2A, 2A"), characterised in that said fluid circulation means comprise channels (6) that are formed at least in part in thickened ends of said walls (32), on the same side as said perforated plate (2, 2A, 2A), and/or at least in part in regions of the perforated plate (2, 2A, 2A’) situated in the longitudinal extension of said thickened ends.
2. Panel (1) according to claim 1, characterised in that the channels (6) are formed in part by grooves opening towards the outside of the cellular structure (3) and produced at least in part in the thickened ends of said walls (32).
3. Panel (1) according to either claim 1 or claim 2, characterised in that the cellular structure (3) and at least part of the perforated plate (2, 2A, 2A") are formed in a single piece.
4. Panel (1) according to claim 3, characterised in that an internal layer (2) of the perforated plate (2, 2A, 2A") is formed in a single piece with the cellular structure (3), and in that the perforated plate (2, 2A, 2A") further comprises a perforated external layer (2A) that is fixed, for example by adhesive bonding or brazing, to said internal layer (2) and which comprises openings (21A) aligned with those (21) of said internal layer (2).
5. Panel (1) according to either claim 1 or claim 2, characterised in that the perforated plate (2, 2A, 2A") is formed by a perforated external plate (2A") that is fixed, for example by adhesive bonding or brazing, to the cellular structure (3).
6. Panel (1) according to either claim 4 or claim 5, characterised in that said perforated external layer (2A), or said perforated external plate (2A'), comprises grooves (6A)
that face the cellular structure (3) and are designed to define at least a portion of said channels (6).
7. Panel (1) according to claim 2, characterised in that the grooves forming the channels (6) are closed by attached elements (8, 2A, 2A") that are fixed to the thickened ends of said walls (32), on the side opposite said structure (3).
8. Panel (1) according to claim 7, characterised in that the attached elements comprise inserts (8) that are engaged in the channels (6) and fixed to the perforated plate (2), for example by welding.
9. Panel (1) according to any of claims 4 to 6, characterised in that said perforated external layer (2A), or said perforated external plate (2A), is produced from a flexible material, preferably heat-conducting, and/or a metal material.
10. Propulsion assembly characterised in that it comprises at least one panel (1) according to any of claims 1 to 9.
11. Method for manufacturing a panel (1) according to claim 1, characterised in that it comprises the formation of channels (6), at least in part in thickened ends of said walls (32), on the same side as said perforated plate (2, 2A, 2A"), and/or at least in part in regions of the perforated plate (2, 2A, 2A") situated in the longitudinal extension of said thickened ends.
12. Method according to claim 11, characterised in that it comprises the formation of the perforated plate (2, 2A, 2A") and of the cellular structure (3) in a single piece by additive manufacturing, and the formation of the channels (6) in the thickened ends of said walls (32) during the additive manufacturing.
13. Method according to claim 11, characterised in that it comprises the steps consisting of:
- forming the perforated plate (2) and the cellular structure (3) in a single block, for example by machining a block of material,
- producing channels (6), by removal of material, on a face of the plate (2) situated on the opposite side to the cellular structure (3), and
- attaching or fixing to said plate (2) one or more elements for closure ~~ 2A) of the channels
(6).