Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Riblet Foil and Method for Producing Same

Inactive Publication Date: 2014-12-04
EADS DEUT GMBH
View PDF3 Cites 22 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a simple method for producing a riblet foil with desired form, size, and properties from any metallic powder. The foil is thin and easily adjusts to the structural component to which it is applied while having minimal weight. The metallic riblet foil can also be refined by applying an adhesive coating and modifying its surface for fastness against contamination or icing.

Problems solved by technology

However, structured plastic foils that have been used to date lack mechanical durability and suffer from degradation of the plastic foil as well as of the glue by which these foils are to adhere to the aircraft.
Degradation effects can even cause the plastic foils to become detached while in operation.
However, such a direct application of a structure or texture by means of casting method or by removal-machining methods (structure generation by a laser or micro-milling means, etc.) does not make technical or economic sense for use on the large areas, as are required on aircraft, helicopters or other flying devices.
High-strength materials, such as, for example, titanium alloys with tensile strength values of up to 1700 MPa, can no longer be sufficiently plasticized by the application of a deformation pressure, whereby the riblet structure cannot be achieved at all, or only coarsely, on the metal foil.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Riblet Foil and Method for Producing Same
  • Riblet Foil and Method for Producing Same
  • Riblet Foil and Method for Producing Same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0032]FIG. 1a is a sketch-type depiction of a riblet foil. A reference mold 11 includes an area 12 and a riblet structure 13. Using a coater system 16, metallic particles 15 of a metallic powder are accelerated to a high speed in the direction toward the area 12. Due to the impact, the metallic particles 15 become deformed and combine to form a metallic material. A continuous spraying action of metallic particles 15 against the area 12 results in a layer-type buildup of a layered portion 14. When the thickness of the layered portion 14 has reached the thickness that is required for the application the spray-on action of metal powder is complete.

[0033]In this embodiment, the coater system 16 is a system for cold gas spraying. A carrier gas is compressed and accelerated by relaxation of the same inside a nozzle to a speed that is below the speed of sound of the carrier gas. The metallic powder is injected into the gas jet. The carrier gas has a temperature that is below the temperatur...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Thicknessaaaaaaaaaa
Structureaaaaaaaaaa
Speedaaaaaaaaaa
Login to View More

Abstract

A method for producing a layer-type buildup of riblet foil involves applying a metal powder is to a reference mold, which has a female mold of a riblet structure, in such a manner that a metallic material is formed. The layered portion applied in this manner is then detached, thereby forming a riblet foil having a riblet structure.

Description

FIELD OF THE INVENTION[0001]Exemplary embodiments of the present invention relate to a riblet foil and to a method for producing same. In particular, the riblet foil is made of metallic material and composed by way of layering said material onto a reference mold. The riblet foil has a riblet structure that reduces air resistance.BACKGROUND OF THE INVENTION[0002]Lowering fuel consumption and reducing carbon dioxide / nitrogen oxide (CO2 / NOx) emissions are important objectives to be met, particularly by the aviation and automotive industries. Aside from light construction modalities to achieve weight reductions and improvements to the efficiency of the drive systems, reducing air resistance constitutes one essential component in achieving these goals.[0003]Methods for producing surfaces that reduce the resistance to air flow are known in the art. It has been known for a long time, and, moreover, it has been proven in oil channel experiments, that, by providing solid surfaces with suitab...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): B22F3/00B22F3/18B22F3/115
CPCB22F3/00B22F3/18B22F3/115B22F7/02
Inventor GAMMEL, FRANZROHR, OLIVER
Owner EADS DEUT GMBH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products