Forcing boundary-layer transition on an inverted airfoil in ground effect

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dc.contributor.authorRoberts, L. S.
dc.contributor.authorFinnis, Mark V.
dc.contributor.authorKnowles, Kevin
dc.contributor.authorLawson, Nicholas J.
dc.date.accessioned2017-08-23T14:09:10Z
dc.date.available2017-08-23T14:09:10Z
dc.date.issued2017-07-21
dc.description.abstractThe influence of the laminar boundary-layer state on a wing operating in ground effect has been investigated using experiments with a model that provides two-dimensional flow. The effect of a boundary-layer trip placed at varying distances from the leading edge was observed at various incidences in terms of on-surface characteristics, including pressure measurements, flow visualization, and hot-film anemometry, and off-surface characteristics with velocity surveys below and behind the wing. The act of forcing transition led to downforce being reduced and drag increased, moreover, it altered almost all aspects of the wing’s aerodynamic characteristics, with the effect becoming greater as the trip was placed closer to the leading edge. These aspects include the replacement of a laminar separation bubble with trailing-edge separation, a thicker boundary layer, and a thicker wake with greater velocity deficit. The importance of considering laminar phenomena for wings operating in ground effect has been shown.en_UK
dc.identifier.citationRoberts LS, Finnis MV, Knowles K, Lawson NJ. (2017) Forcing boundary-layer transition on an inverted airfoil in ground effect. Journal of Aircraft, Volume 54, Issue 6, November 2017, pp. 2165-2172en_UK
dc.identifier.cris17519792
dc.identifier.issn0021-8669
dc.identifier.urihttp://dspace.lib.cranfield.ac.uk/handle/1826/12369
dc.identifier.urihttp://dx.doi.org/10.2514/1.C034304
dc.publisherAIAAen_UK
dc.rightsAttribution-NonCommercial 4.0 International
dc.rights.urihttp://creativecommons.org/licenses/by-nc/4.0/
dc.subjectBoundary Layer Separation
dc.subjectAirfoil
dc.subjectTrailing Edges
dc.subjectAdverse Pressure Gradient
dc.subjectAerodynamic Characteristics
dc.subjectTwo Dimensional Flow
dc.subjectGround Effect Machines
dc.subjectStress Distribution
dc.subjectWind Tunnels
dc.subjectStatic Pressure
dc.titleForcing boundary-layer transition on an inverted airfoil in ground effecten_UK
dc.typeArticleen_UK

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