渐缩比
渐缩比（常用符号λ）为航天工程名词，表示飞行器机翼之翼尖（wing tip，ct）与翼根（wing root，cr）长度之比值（λ≡ct/cr）。
椭圆翼有着较少的附加阻力[1]，在1930年代时，二战的飞机常常采用椭圆翼。由于椭圆翼制作成本高昂，因此现代飞行器皆改采用由平直翼修改成，有渐缩比的机翼。有渐缩比的机翼，在减少附加阻力的效果上与椭圆翼相当，制作又比较简单。一般机翼的附加阻力在机翼的渐缩比为0.3左右时最小。[2]
参见
[编辑]参考资料
[编辑]- ^ Jonh Anderson. Fundamentals of Aerodynamics，4th. Edition. New York: McGRAW-Hill. 2005. ISBN 0071254080.
- ^ Jonh Anderson. Aircraft Performance and Design. New York: McGRAW-Hill. 1999. ISBN 0071160108.
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