High Temperature Oxidation Stability of Aerodynamically Optimised Riblets for Blades of Aero-engine Applications

Mechanical Properties of Shark‐Skin Like Structured Surfaces for High‐Temperature Applications

“…This effect was studied previously for IN718 þ NiCoCrAlY system in ref. [13] It was found that the realistic application temperature of riblets lies around 1 000 C in terms of oxidation stability. For TNMB1, the riblet fabrication leads to the formation of mixed oxides (titania and alumina) riblets that were well adherent up to 1 000 h at 900 C. These results give an impression of the long-term stability of the riblets.…”

“…The results are published in detail elsewhere. [13] Major results include 1) At 900 C, slowly growing oxides have formed on ridge of the riblets and were intact even after 1 000 cycles with some changes in the geometry due to local spinel formation and subsequent oxide spallation on the riblets, i.e., the desired advantage of friction drag reduction is maintained for a long time. 2) Rapidly growing oxides have formed at 1 100 C and spallation was observed even after 10 cycles.…”

“…More detailed information on methods and microstructure characterization is available in previous publications. [12,13] The third part of this paper refers to the mechanical characterization of the novel-structured material systems.…”

Desarrollo y optimización de recubrimientos de aleación MCrAlY con dispersión de cargas cerámicas obtenidos por proyección térmica sostenible para aplicaciones de resistencia a oxidación a altas temperaturas

“…(López & Alvarez, 2012). Con el fin de aumentar su eficiencia, se ha utilizado la observación de la naturaleza para reducir la fricción en superficies y optimizarlas aerodinámicamente (Naraparaju, Schulz, & Büttner, 2015). La reducción de la fricción de la superficie en la industria de la aviación contribuye al ahorro de combustible, que es un aspecto positivo para el medio ambiente y que puede conducir a costes más bajos.…”