Influence of fluid-structure interaction modelling on the stress and fatigue life evaluation of a gas turbine blade

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dc.contributor.authorUbulom, Iroizan
dc.date.accessioned2020-12-11T15:27:09Z
dc.date.available2020-12-11T15:27:09Z
dc.date.issued2020-10-27
dc.description.abstractA computational method of fluid-structure coupling is implemented to predict the fatigue response of a high-pressure turbine blade. Two coupling levels, herein referred to as a “fully coupled” and “decoupled” methods are implemented to investigate the influence of multi-physics interaction on the 3 D stress state and fatigue response of a turbine blade. In the fully-coupled approach, the solutions of the fluid-flow and the solid-domain finite element problem are obtained concurrently, while in the decoupled approach, the independently computed aerodynamic forces are unilaterally transferred as boundary conditions in the subsequent finite element solution. In both cases, a three-dimensional unsteady stator-rotor aerodynamic configuration is modelled to depict a forced-vibration loading of high-cycle failure mode. Also analyzed is the low-cycle phenomenon which arises due to the mean stresses of the rotational load of the rotating turbine wheel. The coupling between the fluid and solid domains (fully-coupled approach) provides a form of damping which reduces the amplitude of fluctuation of the stress history, as opposed to the decoupled case with a resultant higher amplitude stress fluctuation. While the stress amplitude is higher in the decoupled case, the fatigue life-limiting condition is found to be significantly influenced by the higher mean stresses in the fully-coupled method. The differences between the two approaches are further explained considering three key fatigue parameters; mean stress, multiaxiality stress state and the stress ratio factors. The study shows that the influence of the coupling between the fluid and structures domain is an important factor in estimating the fatigue stress history.en_UK
dc.identifier.citationUbulom I. (2021) Influence of fluid-structure interaction modelling on the stress and fatigue life evaluation of a gas turbine blade. Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy, Volume 235, Issue 5, August 2021, pp. 1019-1038en_UK
dc.identifier.issn0957-6509
dc.identifier.urihttps://doi.org/10.1177/0957650920967559
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/16083
dc.language.isoenen_UK
dc.publisherSAGEen_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectFluid-structure interactionen_UK
dc.subjectlow-cycle fatigueen_UK
dc.subjecthigh-cycle fatigueen_UK
dc.subjectrainflow cyclesen_UK
dc.subjectstrain-energy densityen_UK
dc.subjectforced-responseen_UK
dc.subjectaerodynamic dampingen_UK
dc.subjecthigh-pressure turbine bladeen_UK
dc.titleInfluence of fluid-structure interaction modelling on the stress and fatigue life evaluation of a gas turbine bladeen_UK
dc.typeArticleen_UK

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