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每到秋天,一队队的雁,往往排成人字形,长途飞徙到温暖的南方去,许多诗人、文学家赞赏它们的队形,称许它们守纪律。其实并不是由于雁懂规矩,而是由于长期的飞迁生涯训练了它们。从鸟翼的扑动的空气动力学分析知道:当翅膀扑下去的时候,鸟翼上面的空气就变得稀薄,压力随之降低,形成一个低压区域,相反翅膀的下方则构成了高压区。因此鸟就被举起来了。但是翅膀上面的低压区是暂时的,四面八方的空气因压力差而很快流来。其中就有一股是翅膀下面“高压”的空气,绕过翼梢补充到上面, 雁在长途飞行中学会了利用这股微弱的向
Every fall, the geese of a team often line up with adult characters and travel long distances to the warm south. Many poets and writers admired their formation and praised them for discipline. In fact, it is not because of wild goose rules, but because of their long-term relocation career. From the aerodynamic analysis of the flapping of a bird’s wing, it is known that when the wing flaps, the air above the bird’s wing becomes thin, and the pressure decreases, forming a low pressure area, whereas the lower part of the wing forms a high pressure area. So the bird was lifted. But the low pressure area above the wings is temporary, and the air from all directions flows quickly due to the pressure difference. One of them was the “high pressure” air under the wing, which was added to the top of the wing. The geese learned to use this weak direction during the long flight.