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  • Bernoulli法

    Race car with a prominent TELMEX spoiler designed for increased downforce on the track.

    Look at the large bar (labeled “TELMEX”) across the back of this race car. The bar is called a spoiler. It causes air pressure to push the car toward the ground. This increases between the wheels and the pavement, helping the car to hug the track. How does a spoiler work? Bernoulli’s law has the answer.
    ::看看这辆赛车背面的大条(标签为“TELMEX ” ) 。 酒吧被称为捣毁者。 它造成气压,将车推向地面。 车轮和人行道之间增加气压,帮助车轮拥抱车道。 破坏者是如何工作的? 伯努利的法律有答案。

    What Is Bernoulli’s Law?
    ::伯努利的法律是什么?

    Bernoulli’s law states that the pressure of a moving fluid such as air is less when the fluid is moving faster. Pressure is the amount of force applied per given area. The law is named for Daniel Bernoulli, a Swiss mathematician who discovered it during the 1700s. Bernoulli used mathematics to arrive at his law. 
    ::Bernoulli的法律规定,空气等流动流体在流体移动速度较快时压力会更小。 压力是每个特定区域所应用的强度。 法律命名为Daniel Bernoulli,他是瑞士数学家,在1700年代发现它。 Bernoulli用数学达成他的法律。

    Q : How does a spoiler on a racecar use Bernoulli’s law?
    ::问:赛车的破坏者如何使用伯努利的法律?

    A : A spoiler on a racecar is like an upside-down wing. Its shape causes air to flow more slowly—and air pressure to be greater—above the spoiler than below it. As a result, air pressure pushes the car downward, helping it to stay on the track.
    ::甲:赛车上的破坏者就像一个倒向翼。 它的形状导致空气流慢得多,空气压力则大于破坏者。 结果,气压将汽车推向下,帮助它留在赛道上。

    Using Air Pressure to Fly
    ::使用气压向飞翔

    Did you ever wonder how the wings of airplanes or birds allow them to fly?  Bernoulli’s law provides the answer. 
    ::你是否曾想过飞机或鸟类的翅膀如何允许它们飞行? 伯努利的法律提供了答案。

    A plane and a hawk in flight, illustrating Bernoulli's law on air pressure.

    Look at the wings of the plane and hawk in the  Figure . The shape of the wings causes air to flow more slowly below them than above them. This causes air pressure to be greater below the wings than above them. The difference in air pressure lifts the plane or bird above the ground.
    ::机翼的形状导致空气在机翼下流的速度比在机翼下流的速度慢得多。这造成机翼下方的空气压力大于在机翼上方的气压。气压的差别使飞机或鸟升到地面上。

    Watch the following video to learn more about how air pressure lifts an airplane or bird:
    ::更多了解气压如何提升飞机或鸟类:

     

    Launch the Airplane simulation below to further explore the forces of flight:
    ::发射以下飞机模拟,以进一步探索飞行力:

    Summary
    ::摘要

    • Bernoulli’s law states that the pressure of a moving fluid such as air is less when the fluid is moving faster.
      ::Bernoulli的法律规定,流体移动速度较快时,空气等流动流体的压力会更小。
    • Bernoulli’s law explains how wings of airplanes and birds create lift and allow them to fly.
      ::Bernoulli的法律解释了飞机和鸟类的翅膀是如何制造升降并允许它们飞翔的。

    Review
    ::回顾

    1. What is Bernoulli’s law?
      ::伯努利的法律是什么?
    2. Explain how the wings of an airplane create lift that allows the plane to leave the ground.
      ::解释一下飞机的翅膀是如何制造升降机 使飞机能够离开地面的