马蹄涡
马蹄涡（英語：horseshoe vortex）是一种简化的机翼涡系模型，由跟随机翼运动的等环量附着涡（bound vortex）和在左、右翼尖处形成的翼尖涡组成。这三条涡线形成类似马蹄的形状，马蹄涡也因之得名。[1][2]此外，当机翼在流场中从静止开始起动时，另有一起动涡从机翼后脱落，但很快因黏性而耗散。[3]同时，远离飞行器的翼尖涡也同样因此而耗散。
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马蹄涡模型假设环量沿翼展不变（此时由库塔-儒可夫斯基定理可知升力亦沿翼展不变），但这与实际情形并不相符。在更接近实际的升力线理论中，旋涡强度沿翼展方向不断变化，强度的改变导致涡从整个机翼后缘脱落形成涡面，而非仅在左、右翼尖处形成涡线。[5]
参考文献
- ^ Millikan, Clark B., Aerodynamics of the Airplane, Figure 1.35
- ^ McCormick, Barnes W., Aerodynamics, Aeronautics, and Flight Mechanics, Chapter 3
- ^ Shed Vortex. NASA Glenn Research Center. [April 11, 2015]. （原始内容存档于2015-04-06）.
- ^ McCormick, Barnes W., Aerodynamics, Aeronautics, and Flight Mechanics, Chapter 4
- ^ McCormick, Barnes W., Aerodynamics, Aeronautics, and Flight Mechanics, Figure 4.21
- Anderson, John D. (2007), Fundamentals of Aerodynamics, Section 5.3 (4th ed.), McGraw-Hill, New York NY. ISBN 978-0-07-295046-5
- Clancy, L.J. (1975), Aerodynamics, Section 8.10, Pitman Publishing Limited, London ISBN 0-273-01120-0
- Cook, N.J. (1985), The designer's guide to wind loading of building structures, Part 1, Butterworths, London ISBN 0-408-00870-9
- McCormick, Barnes W., (1979), Aerodynamics, Aeronautics, and Flight Mechanics, John Wiley & Sons, Inc. New York ISBN 0-471-03032-5
- Millikan, Clark B., (1941), Aerodynamics of the Airplane, Section 1-6 John Wiley and Sons, Inc., New York
- Penwarden, A.D., Wise, A.F.E., (1975) Wind environment around buildings, HMSO, London ISBN 0-11-670533-7.
- Piercy, N.A.V. (1944), Elementary Aerodynamics, Article 213, The English Universities Press Ltd., London.
- Von Mises, Richard, (1959), Theory of Flight, Chapter IX - section 4, Dover Publications, Inc., New York ISBN 0-486-60541-8