[특허]Gas ejection duct with acoustic treatment, an aircraft, and a method of fabricating such a duct

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특허 상세정보

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Gas ejection duct with acoustic treatment, an aircraft, and a method of fabricating such a duct

특허상세정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F02C-007/24 B33Y-010/00 B33Y-080/00 B22F-003/105 C22C-019/05 F01D-025/00 F01D-025/30 G10K-011/16 F02K-001/34 F02K-001/82
출원번호	US-0298550 (2016-10-20)
등록번호	US-10125688 (2018-11-13)
우선권정보	FR-15 02204 (2015-10-20)
발명자 / 주소	Loewenstein, Philippe Herfort, Remi
출원인 / 주소	AIRBUS HELICOPTERS
대리인 / 주소	Brooks Kushman P.C.
인용정보	피인용 횟수 : 0 인용 특허 : 7

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A gas ejection duct with acoustic treatment provided with at least one wall referred to as an “acoustic” wall for coming into contact with the gas. The acoustic wall comprises an inner skin and an outer skin that are spaced apart at least in part by a space, the acoustic wall including at least one internal mesh in the space, the mesh defining a plurality of cavities. Each cavity has the shape of a parallelepiped, each mesh extending longitudinally in a direction referred to as the “fabrication” direction that presents an acute angle greater than or equa...

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1. A gas ejection duct with acoustic treatment having at least one mechanical member, the mechanical member having at least one wall referred to as an “acoustic” wall for coming into contact with the gas, the acoustic wall having an inner skin and an outer skin spaced apart at least in part by a space, the acoustic wall including at least one internal mesh arranged in the space, the mesh defining a plurality of cavities, each cavity extending in the thickness direction from the inner skin to the outer skin, the inner skin being for coming into contact with the gas, the inner skin having perforations, each cavity communicating with at least one perforation, wherein each cavity is of parallelepiped shape, each cavity being defined in elevation by a partition referred to as “top” partition and a partition referred to as a “bottom” partition, each cavity being defined transversely by a partition referred to as a “left side” partition and a partition referred to as a “right side” partition which extend in elevation from the bottom partition to the top partition, each cavity being defined transversely in thickness by a non-perforated portion of the outer skin and a perforated portion of the inner skin, at least one of the partitions of a cavity presenting a drain opening opening out to outside the cavity, wherein the gas ejection duct with acoustic treatment extends in elevation from a base to a top, the inner wall and the outer wall and each mesh extend in elevation relative to a fabrication plane referred to as the “horizontal” plane that is tangential to the base, each mesh extends in elevation in a direction referred to as the “fabrication direction” presenting an acute angle greater than or equal to a predetermined angle relative to the horizontal plane, and each of the inner and outer walls presents an acute angle of inclination relative to the horizontal plane that is greater than or equal to the predetermined angle. 2. The gas ejection gas duct with acoustic treatment according to claim 1, wherein the predetermined angle is equal to 45 degrees. 3. The gas ejection gas duct with acoustic treatment according to claim 1, wherein each tangent to either one of the inner and outer skins that is arranged in a plane perpendicular to the horizontal plane presents a said angle of inclination. 4. The gas ejection duct with acoustic treatment according to claim 1, wherein the cavities of a mesh are arranged in elevation one above another, and transversely one beside another. 5. The gas ejection duct with acoustic treatment according to claim 1, wherein each of the partitions is rectangular. 6. The gas ejection duct with acoustic treatment according to claim 1, wherein each cavity has the shape of a non-rectangular parallelepiped, each of the bottom and top partitions presenting an acute angle not equal to 90 degrees relative to the left side partition or the right side partition. 7. The gas ejection duct with acoustic treatment according to claim 1, wherein the acoustic wall is made out of the NiCr19Fe19Nb5Mo3 material. 8. The gas ejection duct with acoustic treatment according to claim 1, wherein at least one of the inner and outer walls presents a thickness less than one millimeter. 9. The gas ejection duct with acoustic treatment according to claim 1, wherein each perforation presents a diameter less than or equal to four millimeters. 10. The gas ejection duct with acoustic treatment according to claim 1, wherein each cavity communicates with at least four perforations with a maximum diameter of 1.5 millimeters. 11. The gas ejection duct with acoustic treatment according to claim 1, wherein the gas ejection duct with acoustic treatment is a nozzle and each mechanical member is selected from a list comprising a skirt, a central cone, and an arm connecting the skirt to the central cone. 12. The gas ejection duct with acoustic treatment according to claim 1, wherein the gas ejection duct with acoustic treatment includes at least one skin having at least one drainage orifice. 13. An aircraft provided with a gas ejection duct with acoustic treatment, wherein the gas ejection duct with acoustic treatment is according to claim 1. 14. A method of fabricating a gas ejection duct with acoustic treatment having at least one mechanical member, the mechanical member having at least one wall referred to as an “acoustic” wall for coming into contact with the gas, the acoustic wall having an inner skin and an outer skin spaced apart at least in part by a space, the acoustic wall including at least one internal mesh arranged in the space, the mesh defining a plurality of cavities, each cavity extending in the thickness direction from the inner skin to the outer skin, the inner skin being for coming into contact with the gas, the inner skin having perforations, each cavity communicating with at least one perforation, wherein each cavity is of parallelepiped shape, each cavity being defined in elevation by a partition referred to as “top” partition and a partition referred to as a “bottom” partition, each cavity being defined transversely by a partition referred to as a “left side” partition and a partition referred to as a “right side” partition which extend in elevation from the bottom partition to the top partition, each cavity being defined transversely in thickness by a non-perforated portion of the outer skin and a perforated portion of the inner skin, at least one of the partitions of a cavity presenting a drain opening opening out to outside the cavity, wherein the gas ejection duct with acoustic treatment is made by performing a laser sintering method, the gas ejection duct with acoustic treatment being built up layer by layer by repeating the following steps: using a roller to deposit a layer of material;locally consolidating the layer; andlowering a tray supporting the gas ejection duct with acoustic treatment that is being fabricated. 15. The method of fabricating a gas ejection duct with acoustic treatment according to claim 14, wherein the gas ejection duct with acoustic treatment extends in elevation from a base to a top, the inner wall and the outer wall and each mesh extend in elevation relative to a fabrication plane referred to as the “horizontal” plane that is tangential to the base, each mesh extends in elevation in a direction referred to as the “fabrication direction” presenting an acute angle greater than or equal to a predetermined angle relative to the horizontal plane, and each of the inner and outer walls presents an acute angle of inclination relative to the horizontal plane that is greater than or equal to the predetermined angle. 16. The method of fabricating a gas ejection gas duct with acoustic treatment according to claim 14, wherein the predetermined angle is equal to 45 degrees. 17. The method of fabricating a gas ejection gas duct with acoustic treatment according to claim 14, wherein each tangent to either one of the inner and outer skins that is arranged in a plane perpendicular to the horizontal plane presents a said angle of inclination. 18. The method of fabricating gas ejection duct with acoustic treatment according to claim 14, wherein the cavities of a mesh are arranged in elevation one above another, and transversely one beside another. 19. The method of fabricating a gas ejection duct with acoustic treatment according to claim 14, wherein each of the partitions is rectangular. 20. The method of fabricating gas ejection duct with acoustic treatment according to claim 14, wherein the acoustic wall is made out of the NiCr19Fe19Nb5Mo3 material.

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Gas ejection duct with acoustic treatment, an aircraft, and a method of fabricating such a duct

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