Experimental investigation of external fan cowl separation for compact nacelles in windmilling scenarios

Simple item page
dc.contributor.authorSabnis, Kshitij
dc.contributor.authorBoscagl, Luca
dc.contributor.authorBabinsky, Holger
dc.contributor.authorMacManus, David G.
dc.contributor.authorSheaf, Christopher T.
dc.date.accessioned2023-07-18T08:52:03Z
dc.date.available2023-07-18T08:52:03Z
dc.date.issued2023-06-08
dc.description.abstractThe slim fan cowl profiles used for ultra-high bypass ratio aircraft engines are designed considering off-design operating conditions, such as engine windmilling during take-off climb out or during cruise. The current paper describes wind tunnel experiments studying how incoming Mach number and engine mass-flow rate influence the aerodynamics governing external fan cowl flow separation in both these windmilling scenarios. A transonic region may form on the forebody surface if the engine becomes inoperative during take-off climb out, with peak Mach number up to 1.2. The subsequent adverse pressure gradient can separate the local boundary layer, resulting in flow separation which originates near the highlight and a more uniform fan cowl pressure distribution. Meanwhile, engine shut down during cruise results in a large supersonic region on the external fan cowl surface which terminates in a normal shock wave. When the Mach number of this shock exceeds about 1.35, a closed separation bubble develops, which causes up to a four-fold increase in the boundary-layer thickness downstream of the shock wave.en_UK
dc.description.sponsorshipEuropean Union funding: 101007598en_UK
dc.identifier.citationSabnis K, Boscagli L, Babinsky H, et al., (2023) Experimental investigation of external fan cowl separation for compact nacelles in windmilling scenarios. In: 2023 AIAA Aviation and Aeronautics Forum and Exposition (AIAA AVIATION Forum), 12-16 June 2023, San Diego, CAen_UK
dc.identifier.isbn978-1-62410-704-7
dc.identifier.urihttps://doi.org/10.2514/6.2023-3394
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/20010
dc.language.isoenen_UK
dc.publisherAIAAen_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.titleExperimental investigation of external fan cowl separation for compact nacelles in windmilling scenariosen_UK
dc.typeConference paperen_UK

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
External_fan_cowl_separation-2023.pdf
Size:
11.61 MB
Format:
Adobe Portable Document Format
Description:
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.63 KB
Format:
Item-specific license agreed upon to submission
Description:
Download

Collections

Staff publications (SATM)