AMT 280 - Lab 5 - Airfoil Flap & Slat Effectiveness(1).pptx...

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AMT 280 Laboratory Period 5Slats and Flaps
Increasing Camber or Energy Additions to the Boundary LayerWindtunnelsplitWindtunnelMovable slat
AMT 280 LaboratoryAirfoil Slat & Flap EffectsOne of the ways to improve the versatility and flightcharacteristics of an airplane is to install wing flaps andslats.Flaps are designed so that when extended theynot only provide higher lift but also have higher drag.This allows a steep angle of descent at slow airspeedswith but keeps the engines spooled up power output-go-aroundObjectivesObserve the effects of the flap and the slat on a model airfoilwith respect to lift and drag.Observe the general airflow pattern over the airfoil while usingflaps and slats.To observe the creation of wing tip vortices
Airfoil Slat & Flap EffectsEffect of high lift devicesThe primary purpose of high lift devices(flaps, slots, slats, etc.) is to increase theCLmaxof the aircraft and to reduce the stallspeed.Take-off and landing speeds are alsoreduced and engines are spooled up.
Krueger/Leading edge flapKrüger flaps were invented byWerner Krüger in 1943 andevaluated in the wind tunnels inGöttingen, Germany. One of theearliest applications was theBoeing 707 in 1954.The flap was added to preventwing stall with an extreme attitudetake-off with the tail dragging onthe runway, a scenario that hadalready caused two deHavillandComet accidents.
Slotted flap – high-energy air from thelower surface is ductedto the flap uppersurface.This air from the slotaccelerates the uppersurface boundary layerand delays airflowseparation to somehigher lift coefficient.This flap causes muchgreater increases inCLmaxthan the plain orsplit flap and sectiondrags are much lowerFowler-Flap
Slats also called leading edgedevices

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Term
Spring
Professor
N/A
Tags
Airfoil, Wing design, Flap, slats, Leading edge slats

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