Sensitivity Analysis of Rotor/Stator Interactions Accounting for Wear and Thermal Effects within Low- and High-Pressure Compressor Stages

Nyssen, Florence; Batailly, Alain

doi:10.3390/coatings10010074

Cited by 7 publications

(6 citation statements)

References 14 publications

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Section: Introductionmentioning

confidence: 99%

“…In return through the reduction of nominal clearances between rotating blade disks and the surrounding casing, this greatly lowers operating costs and fuel consumptions whilst also improving engine performance. 5,6 For example, Nyssen provides a detailed model to predict and validate contact forces often seen between blade and disc providing an approach to optimise clearances. Similarly, Delebarre investigated AlSi seal interaction with nickel alloy producing a quantitative approach to the interaction forces through study of micrographs to best quantify the wear behaviour and mechanisms.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of wear mechanics and behaviour of NiCr metallic foam abradables

Liu

Marshall

Rahimov

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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Current aero-engine sealing materials are reaching their operating limit, as manufacturers seek more efficient engines with longer service lives. Even when utilised in optimum conditions, current materials have inconsistencies in performance due to variabilities in their microstructure, which lead to undesirable responses and events. As such, a new generation of sealing materials is required. Metallic foams are one such material, given the opportunities that exist to both engineer material properties, and achieve relatively consistent microstructures when compared to the current class of thermally sprayed abradable materials. In this study, the abradability of a nickel (70%)–chromium (30%) (NiCr) alloy foam is investigated, with the role of cell size and filler material considered. Tests are performed on a representative high-speed test rig, where a flat blade is used to simulate an aero-engine incursion event. A series of in situ measurement techniques, such as force, temperature and stroboscopic wear measurements are used to characterise the incursion, with DIC (Digital Image Correlation) techniques also employed to investigate breakdown of the foam. Unfilled foams were shown to lead to high blade wear, with the inclusion of filler materials leading to load transfer and collapse of the foam away from the incursion site, along with improved fracture. Both load transfer and ligament collapse mechanisms were found to promote more favourable rub mechanics at all incursion rates tested.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation of wear mechanics and behaviour of NiCr metallic foam abradables

Liu

Marshall

Rahimov

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…In addition, a dense bond layer, typically Ni5Al intermetallic, is usually provided between the substrate and the required functional abradable coating, in order to obtain enough adhesion strength of the whole coating system [7]. A typical abradable material currently used in the compressor section of a gas turbine is the air plasma applied Al-BN coating, with an Al metal matrix and BN self-lubricating phase, and usually with a plasma sprayed NiAl as bond layer [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Galvanic Corrosion Performance of an Al–BN Abradable Seal Coating System in Chloride Solution

et al. 2020

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In this study, we investigated the galvanic corrosion performance of an Aluminum–Boron Nitride (Al–BN) abradable seal coating system (with a Ni5Al bond layer and a 0Cr17Ni4Cu4Nb substrate) in chloride solution by electrochemical methods. The results indicated a three-stage process occurred during the anodic dissolution of the coupled coating system, consisting of a spontaneous pitting stage I under charge transfer control with a decreasing rate, a corrosion developing stage II under mass transfer control with an increasing rate, and a final steady stage III. Precipitation of Al(OH)3 restricts the oxygen transport process to the cathode and induces localized acidification of the occluded pores of the Al–BN layer, which was the mechanism that could explain the changes of corrosion performance during the three immersion stages of Al–BN coating system. The study suggests that galvanic corrosion of the porous multi-layer Al–BN abradable coating system is mostly influenced by its corrosion product deposition.

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“…The frictional properties of machined elements can be improved by surface texturing [4][5][6]. Coatings make the surface life robust from wear [3,[5][6][7][8][9][10][11] and corrosion [7][8][9]. The resistance to motion can be improved by change of the oil [12].…”

mentioning

confidence: 99%

“…To reduce the severity of this contact, an abradable coating can be deposited along the stator circumference. The analysis of rotor/stator interactions considering the rotor angular speed and the initial clearances was performed in [10].…”

mentioning

confidence: 99%