Unsteady swirl distortion in a short intake under crosswind conditions

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dc.contributor.authorPiovesan, Tommaso
dc.contributor.authorZachos, Pavlos K.
dc.contributor.authorMacManus, David G.
dc.contributor.authorSheaf, Christopher
dc.date.accessioned2025-01-21T15:01:21Z
dc.date.available2025-01-21T15:01:21Z
dc.date.freetoread2025-01-21
dc.date.issued2025-05
dc.date.pubOnline2024-12-13
dc.description.abstractUnder crosswind operating conditions, the flow field of an aero-engine intake can be characterized by notable unsteady flow distortion. These distortions are typically associated with flow separation within the intake as well as with the ingestion of the ground vortex. This unsteady flow distortion can have a detrimental effect on the intake performance and potentially on the operability of the downstream compression system. Measurements of the unsteady velocity field within a model-scale intake under crosswind conditions were acquired using stereo particle image velocimetry (S-PIV). This work analyzes the S-PIV data to quantify the unsteady flow distortion, as well as the characteristics of the ingested ground vortex, in a short intake under crosswind conditions. The swirl distortion metrics were calculated for a range of crosswind velocities and intake mass flow capture ratios (MFCRs). The conditions at which the intake flow separates depend on crosswind velocity, ground clearance, the design of the intake, and the MFCR. Flow characteristics of both low MFCR diffusion-driven and high MFCR shock-induced separation were identified. The circumferential extent and intensity of the swirl distortion are strongly dependent on the crosswind velocity and mass flow rate. The swirl distortion caused by the diffusion-driven separation is greater than that due to the shock-induced separation. The diffusion-driven separation affects a larger portion of the intake aerodynamic interface plane with greater time-averaged and peak distortion levels compared to shock-induced separation. The ground vortex characterization at the aerodynamic interface plane showed a decreasing level of unsteadiness in vortex meandering with increasing MFCR.
dc.description.journalNameAIAA Journal
dc.description.sponsorshipThis work presented in this paper was conducted under project NIFTI which received funding from the CLEAN SKY 2 Joint Undertaking (JU) under Grant Agreement no. 864911. The JU receives support from the European Union’s Horizon 2020 research and innovation programme and the CLEAN SKY 2 JU members other than the Union.
dc.format.extent1867-1884
dc.identifier.citationPiovesan T, Zachos PK, MacManus DG, Sheaf C. (2024) Unsteady swirl distortion in a short intake under crosswind conditions. AIAA Journal, Volume 63, Issue 5, May 2025, pp. 1867-1884en_UK
dc.identifier.eissn1533-385X
dc.identifier.elementsID561023
dc.identifier.issn0001-1452
dc.identifier.issueNo5
dc.identifier.urihttps://doi.org/10.2514/1.j064226
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/23408
dc.identifier.volumeNo63
dc.languageEnglish
dc.language.isoen
dc.publisherAIAAen_UK
dc.publisher.urihttps://arc.aiaa.org/doi/10.2514/1.J064226
dc.rightsAttribution 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectVortex Dynamicsen_UK
dc.subjectMass Flow Rateen_UK
dc.subjectParticle Image Velocimetryen_UK
dc.subjectBoundary Layersen_UK
dc.subjectFlow Conditionsen_UK
dc.subjectAircraft Enginesen_UK
dc.subjectFluid Flow Propertiesen_UK
dc.subjectCompression Systemsen_UK
dc.subjectAerodynamic Characteristicsen_UK
dc.subjectGerman Dutch Wind Tunnelsen_UK
dc.subject4012 Fluid Mechanics and Thermal Engineeringen_UK
dc.subject40 Engineeringen_UK
dc.subjectAerospace & Aeronauticsen_UK
dc.subject4001 Aerospace engineeringen_UK
dc.subject4012 Fluid mechanics and thermal engineeringen_UK
dc.titleUnsteady swirl distortion in a short intake under crosswind conditionsen_UK
dc.typeArticle
dcterms.dateAccepted2024-11-05

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