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Shark inspired surfaces for aerodynamically optimized high temperature applications

Büttner, Claudia and Fröhlich, Maik and Schulz, Uwe (2009) Shark inspired surfaces for aerodynamically optimized high temperature applications. Euromat 2009, 07.-10. Sep. 2009, Glasgow, Großbritannien. (Unpublished)

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The high speed of sharks is caused by a reduced friction between water and skin due to a riblet structure on the skin surface. This effect has already been used for airfoil wings that were laminated with polymer based riblets. It provides a reduced flow resistance resulting in less fuel consumption. A new application for riblet surfaces could be jet engine blades. The reduced friction of the gas flow would lead to higher efficiencies of engines. Calculations show that the riblet size on jet engine blades varies between single-digit micrometers up to several tens of micrometers, depending on local temperature, pressure and gas velocity. In this study structuring surface areas of high temperature nickel alloys, which are used for compressor and turbine blades near the combustion chamber, was investigated. The suitability of several structuring methods on high temperature materials has been examined. Initially, experiments were performed by depositing titanium on a nickel base alloy through particular metal grids using magnetron sputtering. Furthermore, riblets were successfully produced on a NiCoCrAlY coating by picosecond laser treatment. The ideal structured coating combines high oxidation resistance with low friction in a hot gas flow. For single-digit micrometer structures, photolithography with subsequent electrodeposition of nickel was investigated. All fabricated structures were oxidized at 900-1000°C for up to 100h and the resulting shape was characterized using scanning electron microscopy. The most accurate structures were obtained using photolithography. Here, the shape of the riblets persisted also after oxidation.

Item URL in elib:https://elib.dlr.de/60381/
Document Type:Conference or Workshop Item (Speech)
Title:Shark inspired surfaces for aerodynamically optimized high temperature applications
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Date:8 September 2009
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:High Temperature Materials, Protective Coating, Shark Skin, Structuring, Micrometer
Event Title:Euromat 2009
Event Location:Glasgow, Großbritannien
Event Type:international Conference
Event Dates:07.-10. Sep. 2009
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Propulsion Systems (old)
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Turbine Technologies (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > High Temperature and Functional Coatings
Deposited By: Büttner, Claudia
Deposited On:03 Nov 2009 17:18
Last Modified:03 Nov 2009 17:18

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