A comparative assessment of multi-objective optimisation methodologies for aero-engine nacelles

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dc.contributor.authorSwarthout, Avery
dc.contributor.authorMacManus, David
dc.contributor.authorTejero, Fernando
dc.contributor.authorMatesanz García, Jesús
dc.contributor.authorBoscagli, Luca
dc.contributor.authorSheaf, Christopher
dc.date.accessioned2022-09-14T10:30:27Z
dc.date.available2022-09-14T10:30:27Z
dc.date.issued2022-09-09
dc.description© The Author.
dc.description.abstractThere are significant environmental and economic drivers for the development of more fuel-efficient commercial aircraft engines. The propulsive efficiency benefits of ultra-high bypass ratio turbofans may be counteracted by the drag and weight penalty associated with larger nacelles. A more compact nacelle design may therefore be necessary to reduce these penalties. However, increasing compactness also increases the sensitivity of the nacelle to boundary layer separation under off-design windmilling conditions. This paper investigates methods for incorporating windmilling considerations alongside design point requirements within a multi-objective, multi-point optimisation. Windmilling under aircraft diversion and at the end-of-runway (EoR) condition are considered. The windmilling conditions are assessed through a combination of regression and classification type criteria. The transonic aerodynamics of the nacelle at the design point are notably different from the transonic characteristics at the diversion windmilling conditions. Meanwhile, the aerodynamics, and separation mechanisms, at the end-of-runway condition are dominated by subsonic diffusion. Overall, a combination of regression and classification mechanisms are found to be most suitable for the nacelle optimization as it delivers a design population which is favorably balanced between robustness against boundary layer separation as well as delivering nacelle drag benefits.en_UK
dc.identifier.citationSwarthout A, MacManus D, Tejero F, et al., (2022) A comparative assessment of multi-objective optimisation methodologies for aero-engine nacelles. In: ICAS 2022: 33rd Congress of the International Council of the Aeronautical Sciences, 4-9 September 2022, Stockholm, Swedenen_UK
dc.identifier.issn2958-4647
dc.identifier.urihttps://www.icas.org/ICAS_ARCHIVE/ICAS2022/data/preview/ICAS2022_0162.htm
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/18448
dc.language.isoenen_UK
dc.publisherICASen_UK
dc.rights© The Author.
dc.rightsAttribution 4.0 International
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectnacelleen_UK
dc.subjectoptimisationen_UK
dc.subjectCFDen_UK
dc.subjectoff-designen_UK
dc.subjectseparationen_UK
dc.titleA comparative assessment of multi-objective optimisation methodologies for aero-engine nacellesen_UK
dc.typeConference paperen_UK

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