About: Supercritical airfoil

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A supercritical airfoil (supercritical aerofoil in British English) is an airfoil designed primarily to delay the onset of wave drag in the transonic speed range. Supercritical airfoils are characterized by their flattened upper surface, highly cambered ("downward-curved") aft section, and larger leading-edge radius compared with NACA 6-series laminar airfoil shapes. Standard wing shapes are designed to create lower pressure over the top of the wing. Both the thickness distribution and the camber of the wing determine how much the air accelerates around the wing. As the speed of the aircraft approaches the speed of sound, the air accelerating around the wing reaches Mach 1 and shockwaves begin to form. The formation of these shockwaves causes wave drag. Supercritical airfoils are designed

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rdf:type	yago:WikicatAmericanInventions yago:Ability105616246 yago:Abstraction100002137 yago:Cognition100023271 yago:Component105868954 yago:Concept105835747 yago:Content105809192 yago:Creativity105624700 yago:Idea105833840 yago:Invention105633385 yago:Part105867413 yago:PsychologicalFeature100023100 yago:WikicatAircraftComponents
rdfs:label	Voilure supercritique (fr) Profilo supercritico (it) Supercritical airfoil (en) 超临界机翼 (zh)
rdfs:comment	Une voilure supercritique est en aéronautique un profil d'aile dont la vitesse critique est plus grande que pour une voilure conventionnelle. La vitesse critique de l'avion est celle qui provoque localement un écoulement supersonique de l'air sur la partie supérieure de l'aile et induit une trainée d'onde. Le Mach critique est celui où, l'avion étant à une vitesse inférieure à celle du son, l'écoulement commence à devenir supersonique sur une partie du profil. Le régime d'écoulement est alors transsonique. (fr) 超临界机翼（英文：Supercritical airfoil或Supercritical Wing）是飛機翼的一種，其設計有別於傳統機翼，其主要功能在於減輕跨音速飛行的（wave drag）。 (zh) A supercritical airfoil (supercritical aerofoil in British English) is an airfoil designed primarily to delay the onset of wave drag in the transonic speed range. Supercritical airfoils are characterized by their flattened upper surface, highly cambered ("downward-curved") aft section, and larger leading-edge radius compared with NACA 6-series laminar airfoil shapes. Standard wing shapes are designed to create lower pressure over the top of the wing. Both the thickness distribution and the camber of the wing determine how much the air accelerates around the wing. As the speed of the aircraft approaches the speed of sound, the air accelerating around the wing reaches Mach 1 and shockwaves begin to form. The formation of these shockwaves causes wave drag. Supercritical airfoils are designed (en) Un profilo alare supercritico è un profilo progettato, in primo luogo, per ritardare l'instaurazione della resistenza d'onda nella gamma di velocità transonica. Le superfici aerodinamiche supercritiche sono caratterizzate dalla superficie del dorso alare appiattita, da un'elevata curvatura della linea di camber in prossimità del bordo di fuga e da un maggiore raggio di curvatura del bordo d'attacco.Quando un velivolo viaggia a velocità inferiori alla velocità del suono, ma vicino a questa (superiore a circa Mach 0,7) in alcuni punti dell'ala l'accelerazione dell'aria causata dalla curvatura del profilo alare può far sì che in certi punti si possano formare zone in cui la velocità del flusso superi la velocità del suono (Mach>1). In quei punti si forma quindi un'onda d'urto, il passaggio br (it)
foaf:depiction
dcterms:subject	American inventions Aircraft wing design
Wikipage page ID	2100390 (xsd:integer)
Wikipage revision ID	1120745522 (xsd:integer)
Link from a Wikipage to another Wikipage	NACA airfoil Boeing 757 Boeing 767 Boeing 777 Boeing C-17 Globemaster III Anti-shock body Area rule Richard T. Whitcomb United Kingdom United States Vought F-8 Crusader Pressure coefficient Wing fence Cross section (geometry) McDonnell Douglas AV-8B Harrier II German Aerospace Center Boundary layer American inventions Boeing 2707 Camber (aerodynamics) Shock waves Stick-shaker Fuel efficiency Patent Mach tuck Speed of sound Stall (fluid dynamics) Aircraft wing design Transonic Drag-divergence Mach number Critical Mach Cruise (flight) Airbus A310 Airfoil Airbus A300 Drag (physics) Flight International North American T-2 Buckeye F-8 Crusader Harrier jump jet Hawker Siddeley Harrier Aeroelasticity Dietrich Küchemann Netherlands Second World War Mach number Supersonic Swept wing Supersonic transport Wave drag Postwar Hawker Siddeley Aviation Wide-body Leading-edge Shockwave Whitcomb area rule Stick-pusher
Link from a Wikipage to an external page	http://www.flightglobal.com/pdfarchive/view/1979/1979%20-%204705.html https://web.archive.org/web/20120308184320/http:/www.flightglobal.com/pdfarchive/view/1979/1979%20-%204705.html%7Carchive-date=8 http://www.centennialofflight.net/essay/Evolution_of_Technology/supercritical/Tech12.htm http://www.nasa.gov/centers/dryden/about/Organizations/Technology/Facts/TF-2004-13-DFRC.html http://www.aerospaceweb.org/question/airfoils/q0003.shtml
sameAs	Supercritical airfoil Supercritical airfoil Supercritical airfoil Supercritical airfoil Supercritical airfoil Supercritical airfoil Supercritical airfoil

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