Mach number

简明释义

马赫数

英英释义

例句

1.Commercial airliners typically cruise at a Mach number of about 0.85.

商业客机通常以大约0.85的马赫数巡航。

2.At Mach number 1, an aircraft breaks the sound barrier.

在马赫数为1时，飞机突破音障。

3.The fighter jet flew at a speed of 2.5, which means its Mach number is 2.5.

这架战斗机以2.5的速度飞行，这意味着它的马赫数是2.5。

4.The Mach number is crucial for determining the aerodynamic characteristics of an aircraft.

对于确定飞机的空气动力学特性，马赫数至关重要。

5.Supersonic jets operate at a Mach number greater than 1.

超音速喷气机的马赫数大于1。

作文

The concept of the Mach number is crucial in the field of aerodynamics and fluid dynamics. It is defined as the ratio of the speed of an object to the speed of sound in the surrounding medium. When an object moves through a fluid, it creates pressure waves, and the Mach number helps us understand whether the object is moving at subsonic, transonic, supersonic, or hypersonic speeds. In simple terms, the Mach number provides a way to classify the speed of an aircraft or any other object in relation to the speed of sound.To elaborate further, a Mach number less than one indicates subsonic speeds, where the object travels slower than sound. For instance, commercial jetliners typically fly at speeds around 0.8 Mach number. This means they are traveling at 80% of the speed of sound. On the other hand, when an object reaches a Mach number of one, it is said to be traveling at the speed of sound, which varies depending on altitude and temperature. At sea level and at standard atmospheric conditions, the speed of sound is approximately 343 meters per second.As we move into the realm of supersonic flight, which is characterized by a Mach number greater than one, we encounter unique challenges and phenomena. Supersonic aircraft, such as the Concorde, could reach speeds of over 2 Mach number, creating shock waves that can lead to sonic booms. These sonic booms are a result of the pressure waves generated by the aircraft compressing together and then releasing as the aircraft moves faster than sound.Furthermore, the concept of the Mach number is not only applicable to aircraft but also to rockets and missiles. In these cases, achieving a high Mach number is essential for overcoming the Earth's gravitational pull and reaching outer space. Rockets often need to exceed a Mach number of 5 to enter the hypersonic regime, which presents yet another set of aerodynamic challenges due to extreme heat and pressure.In conclusion, understanding the Mach number is fundamental for engineers and scientists working in fields related to aerodynamics, aerospace engineering, and fluid dynamics. It allows them to design vehicles that can efficiently operate at various speeds and to predict the behavior of objects moving through air or other fluids. The Mach number serves as a critical parameter in the development of new technologies, from commercial aviation to space exploration. As we continue to push the boundaries of speed in transportation, the significance of the Mach number will only grow, making it an essential topic of study for future innovations in aerodynamics and propulsion systems.

“Mach number”的概念在空气动力学和流体动力学领域至关重要。它被定义为物体速度与周围介质中声速的比率。当物体在流体中移动时，会产生压力波，而Mach number帮助我们理解物体是以亚音速、跨音速、超音速还是高超音速的速度运动。简单来说，Mach number提供了一种将飞机或任何其他物体的速度与声速进行分类的方法。进一步说，Mach number小于一表示亚音速，在这种情况下，物体的速度低于声速。例如，商用喷气机通常以约0.8的Mach number飞行。这意味着它们的速度为声速的80%。另一方面，当物体达到Mach number为1时，表示它正以声速飞行，这个速度会根据高度和温度而变化。在海平面和标准大气条件下，声速大约为每秒343米。当我们进入超音速飞行的领域时，其特征是Mach number大于1，我们会遇到独特的挑战和现象。超音速飞机，比如协和飞机，可以达到超过2的Mach number，产生冲击波，可能导致音爆。这些音爆是由飞机产生的压力波压缩在一起，然后随着飞机以超过声速的速度移动而释放的结果。此外，Mach number的概念不仅适用于飞机，还适用于火箭和导弹。在这些情况下，实现高Mach number对克服地球引力并进入外层空间至关重要。火箭通常需要超过5的Mach number才能进入高超音速区域，这又带来了由于极端热量和压力而产生的一系列空气动力学挑战。总之，理解Mach number对于从事空气动力学、航空航天工程和流体动力学相关领域的工程师和科学家来说是基础。它使他们能够设计能够在各种速度下有效运行的飞行器，并预测在空气或其他流体中移动的物体的行为。Mach number在新技术的发展中起着关键参数的作用，从商业航空到太空探索。随着我们不断推动交通速度的极限，Mach number的重要性只会增加，使其成为未来空气动力学和推进系统创新研究的一个重要主题。