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词汇 Supercritical airfoil
分类 英语词汇 英语翻译词典
释义

Supercritical airfoil

中文百科

超临界机翼

传统机翼(上)及超临界机翼(下)的剖面及气流(蓝色区块)

超临界机翼(英文:Supercritical airfoilSupercritical Wing)是飞机翼的一种,其设计有别于传统机翼,其主要功能在于减轻跨音速飞行的波阻效应(wave drag)。

英语百科

Supercritical airfoil 超临界机翼


Conventional (1) and supercritical (2) airfoils at identical free stream Mach number. Illustrated are: A, Supersonic flow region; B, Shock wave; C, Area of separated flow.  The supersonic flow over a supercritical airfoil terminates in a weaker shock, thereby postponing shock-induced boundary layer separation.
NASA TF-8A in 1973
Supercritical airfoil Mach Number/pressure coefficient diagram.  The sudden increase in pressure coefficient at midchord is due to the shock. (y-axis:Mach number (or pressure coefficient, negative up); x-axis: position along chord, leading edge left)
传统机翼(上)及超临界机翼(下)的剖面及气流(蓝色区块)

A supercritical airfoil 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 (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 by accelerating the air using the Bernoulli's principle. The camber of the wing determines 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 will reach the Mach 1 and shockwaves will begin to form. The formation of these shockwaves causes wave drag. Supercritical airfoils are designed to minimize this effect by flattening the upper surface of the wing.

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