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Innovative processing techniques to obtain aerodynamically optimised riblets in NiCoCrAlY bond coats on aero-engine turbine blades

Naraparaju, Ravisankar und Schulz, Uwe und Büttner, Claudia (2014) Innovative processing techniques to obtain aerodynamically optimised riblets in NiCoCrAlY bond coats on aero-engine turbine blades. ODAS 2014, 2014-06-11 - 2014-06-13, Köln, Germany.

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Kurzfassung

The high speed of sharks is caused by reduced friction between water and skin due to riblet structures on the shark skin. A potential application field for the riblet surfaces is blades and vanes for aeroengines. Those parts require coatings that act as oxidation and corrosion protection and could additionally reduce skin friction drag on the surface when riblets are applied. This reduction in friction of the air flow would lead to higher efficiencies of the engines. The presented work deals with the fabrication, oxidation and characterization of riblet structures with micrometer dimensions on state-of-the-art engine materials for aerodynamically optimized high temperature applications. The necessary riblet sizes for compressor inlet, compressor outlet, turbine inlet, and turbine outlet are calculated on the basis of one example aeroengine. Based on these calculations, the feasibility of various riblet structure fabrication methods is investigated. Direct riblet fabrication methods such as laser material removal and indirect structuring methods such as photolithography and subsequent electrodeposition of nickel have shown the best results in obtaining riblets of desired sizes. The fabricated riblets on EB-PVD deposited NiCoCrAlY bond coats are oxidised at 900°C for simulating the high temperature application in an aeroengine. The structures are found to be intact after oxidation. The effectiveness of the riblet structures to reduce the wall shear stress is measured by scaled-up models in an oil channel. The measured riblet design by means of photolithography and by means of laser removal has shown a significant wall shear stress reduction of 4.9 and 2.41% respectively.

elib-URL des Eintrags:https://elib.dlr.de/95289/
Dokumentart:Konferenzbeitrag (Vortrag)
Zusätzliche Informationen:This work is reviewd
Titel:Innovative processing techniques to obtain aerodynamically optimised riblets in NiCoCrAlY bond coats on aero-engine turbine blades
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Naraparaju, Ravisankarravisankar.naraparaju (at) dlr.dehttps://orcid.org/0000-0002-3944-1132NICHT SPEZIFIZIERT
Schulz, UweNICHT SPEZIFIZIERTNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Büttner, ClaudiaWF-HFNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:13 Juni 2014
Referierte Publikation:Ja
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:NiCoCrAlY coatings, Oxidation, Shark skin
Veranstaltungstitel:ODAS 2014
Veranstaltungsort:Köln, Germany
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:11 Juni 2014
Veranstaltungsende:13 Juni 2014
Veranstalter :DLR, ONERA
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:Antriebssysteme
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L ER - Engine Research
DLR - Teilgebiet (Projekt, Vorhaben):L - Turbinentechnologien (alt)
Standort: Köln-Porz
Institute & Einrichtungen:Institut für Werkstoff-Forschung > Hochtemperatur-und Funktionsschutzschichten
Hinterlegt von: Naraparaju, Dr Ravisankar
Hinterlegt am:09 Apr 2015 13:28
Letzte Änderung:24 Apr 2024 20:01

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