Flow body, method for manufacturing a flow body and aircraft having such a flow body

Patent metadata

Field	Value
Publication number	US-10814962-B2
Application number	US-201414574876-A
Country	US
Kind code	B2
Filing date	Dec 18, 2014
Priority date	Dec 18, 2013
Publication date	Oct 27, 2020
Grant date	Oct 27, 2020

Abstract

An flow body comprises a curved suction skin having a first perforation, a leading edge and two skin sections extending therefrom, wherein each skin section has an outer end facing away from the leading edge, an interior suction duct having a second perforation and extending through an inside of the curved suction skin in a distance from the leading edge, and two sidewall members, connected to the outer ends, wherein the sidewall members are made of a composite material. The suction skin comprises a profiled contour shape, which determines a pressure distribution over at least one of the two skin sections when air flows over the curved suction skin, wherein the pressure distribution comprises a stagnation point, a suction peak and a subsequent local pressure maximum downstream of the suction peak, wherein the first perforation extends from a stagnation point on the suction skin to the local pressure maximum.

First claim

What is claimed is:

1. A flow body comprising:
a curved suction skin in form of a flat sheet metal plate bent to a profiled contour shape having a leading edge, a nose region around the leading edge and two skin sections extending from the nose region, wherein each skin section has an outer end facing away from the leading edge and an exterior perforated area formed in the respective skin section,
a first spar,
an interior suction duct having an interior perforated area and extending through an inside of the curved suction skin at a distance from the leading edge, and
two sidewall members, connected to the outer ends of the skin sections, wherein the sidewall members are made of a composite material,
wherein the first spar is arranged at the inside of the suction skin and is connected to the suction skin at the outer ends,
wherein the interior suction duct is arranged between the first spar and the leading edge,
wherein the profiled contour shape is configured with a nose region radius such that the nose region joins the skin sections, the skin sections join the sidewall members, and the sidewall members join a part following on from the sidewall members to a trailing edge of the flow body such that the nose radius runs into a trailing contour downstream of the sidewall members for generating a pressure distribution over at least one of the two skin sections when air flows over the curved suction skin,
wherein the pressure distribution comprises a stagnation point, a suction peak and a local pressure maximum downstream of the suction peak and upstream of the trailing edge of the flow body, and
wherein the exterior perforated area exclusively extends from the stagnation point to the local pressure maximum on the curved suction skin along the first 10% of the length of the chord of the flow body forward of the sidewall members and no suction element for suction of air through the sidewall members.

2. The flow body of claim 1 , wherein the sidewall members are made of a sandwich material having at least one core layer enclosed between cover layers.

3. The flow body of claim 1 , wherein the interior suction duct is created by an interior wall arrangement fixed to an inside of the curved suction skin, the interior wall arrangement comprising:
a first interior sidewall connected to the first end of the suction skin,
a second interior sidewall connected to the second end of the suction skin,
wherein the first spar is connected to the first and second interior sidewalls at the first and second ends of the suction skin,
a second spar connected to the first and second interior sidewalls at an end opposite to the first and second ends of the suction skin, such that a closed, quadrilateral cross-sectional suction duct surface is created by the first spar, the first interior sidewall, the second spar and the second interior sidewall member, and
wherein the quadrilateral cross-sectional suction duct surface extends at a distance along the leading edge.

4. The flow body of claim 3 , further comprising at least one stringer arranged between at least one of the first interior sidewall, the second interior sidewall and the suction skin, and wherein the at least one stringer extends along the leading edge in a distance thereto.

5. The flow body of claim 4 , wherein the extension of the at least one stringer is interrupted along the leading edge.

6. The flow body of claim 1 , further comprising a plurality of ribs at a distance to each other and arranged along the inside of the suction skin,
wherein the ribs each comprise a cutout, and
wherein the suction duct is tubular and extends through the cutouts of the ribs.

7. The flow body of claim 1 , further comprising a plurality of ribs at a distance to each other and arranged along the inside of the suction skin, a first spar member and a second spar member, wherein the suction duct is created between the suction skin, the first spar member and the second spar member.

8. The flow body of claim 1 , further comprising at least one inner spar delimiting the interior suction duct.

9. The flow body of claim 1 , wherein the two sidewall members are non-perforated.

10. A method for manufacturing a flow body, comprising:
forming a curved suction skin by bending a flat sheet metal plate to a profiled contour shape having a leading edge, a nose region around the leading edge and two skin sections extending from the nose region, wherein each skin section has an outer end facing away from the leading edge,
connecting two sidewall members made of a composite material to the outer ends of the skin sections, such that the profiled contour shape of the suction skin is configured with a nose region radius such that the nose region joins the skin sections, the skin sections join the sidewall members, and the sidewall members join a part following on from the sidewall members to a trailing edge of the flow body such that the nose radius runs into a trailing contour downstream of the sidewall members for generating a pressure distribution over at least one of the two skin sections when air flows over the curved suction skin, which pressure distribution comprises a stagnation point, a suction peak and a local pressure maximum downstream of the suction peak and upstream of the trailing edge of the flow body,
creating a first spar at the inside of the suction skin and in connection to the suction skin at the outer ends,
creating an exterior perforated area exclusively extending from the stagnation point to the local pressure maximum on the curved suction skin along the first 10% of the length of the chord of the flow body forward of the sidewall members and no suction element for suction of air through the sidewall members, and
providing an interior suction duct between the first spar and the leading edge, the interior suction duct having an interior perforated area and extending through an inside of the curved suction skin in a distance from the leading edge.

11. The method of claim 10 , wherein forming the curved suction skin comprises a Super Plastic Forming (SPF) process of a titanium work piece.

12. The method of claim 11 , wherein forming the curved suction skin comprises integrating a plurality of stiffening components at the inside of the suction skin through the SPF process.

13. The method of claim 12 , further comprising brazing ribs to the inside of the suction skin.

14. A flow body comprising:
a curved suction skin in form of a flat sheet metal plate bent to a profiled contour shape having a leading edge, a nose region around the leading edge and two skin sections extending from the nose region, wherein each skin section has an outer end facing away from the leading edge and an exterior perforated area formed in the respective skin section,
a first spar,
an interior suction duct having an interior perforated area and extending through an inside of the curved suction skin at a distance from the leading edge, and
two sidewall members, connected to the outer ends of the skin sections, wherein the sidewall members are made of composite material,
wherein the first spar is arranged at the inside of the suction skin and is connected to the suction skin at the outer ends,
wherein the interior suction duct is arranged between the first spar and the leading edge,
a plurality of ribs at a distance to each other and arranged along the inside of the suction skin, a first spar member and a second spar member,
wherein the profiled contour shape is configured with a nose region radius such that the nose region joins the skin sections, the skin sections join the sidewall members, and the sidewall members join

Assignees

• Airbus Operations Gmbh

Inventors

• Gerber Martin

Classifications

• Y02T50/10

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• B64C2230/04

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• B64C5/02

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• B64C2230/22

  by using a surface having multiple apertures of relatively small openings other than slots · CPC title

• Y10T29/49826

  Assembling or joining · CPC title