…If you plot a graph with the angle of attack α on the horizontal axis, the lift coefficient C L increases linearly from zero lift angle α 0 L until the start of stall (Figure 2-a). The slope (called the lift slope) is determined by the planform regardless of the wing type, and at low speeds, for a straight wing with an infinite aspect ratio, it approaches C L = 2π(α - α 0 L ) (α in this case is in radians). The smaller the aspect ratio, the smaller the lift slope (Figure 2-b), and a larger angle of attack is required to produce the same lift coefficient, approaching C L = π(α - α 0 L ) for a wing with an aspect ratio of 2. … *Some of the terminology that refers to "slope of lift curve" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…迎え角αを横軸にグラフをかくと,揚力係数CLは零揚力角α0Lから失速が始まるまで,ほぼαに比例して直線的に増す(図2-a)。その傾斜(揚力傾斜slope of lift curveという)は翼型に関係なく平面形で決まり,低速度ではアスペクト比無限大の直線翼でCL=2π(α-α0L)に近くなる(この場合のαの単位はラジアン)。アスペクト比が小さくなるほど揚力傾斜は小さくなり(図2-b),同じ揚力係数を出すのに大きな迎え角を必要とするようになり,アスペクト比2の翼ではCL=π(α-α0L)に近くなる。… ※「slope of lift curve」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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