exhaust velocity

简明释义

排气速度

英英释义

例句

1.To achieve orbit, the spacecraft must reach a specific exhaust velocity during its launch phase.

为了达到轨道，航天器在发射阶段必须达到特定的排气速度。

2.The rocket's performance is primarily determined by its exhaust velocity, which is the speed at which gases are expelled from the engine.

火箭的性能主要由其排气速度决定，即气体从发动机排出的速度。

3.Engine designers often aim for a higher exhaust velocity to improve fuel efficiency.

发动机设计师通常追求更高的排气速度以提高燃油效率。

4.Increasing the exhaust velocity can significantly enhance the thrust of a spacecraft.

提高排气速度可以显著增强航天器的推力。

5.The exhaust velocity of a chemical rocket is generally lower than that of an ion engine.

化学火箭的排气速度通常低于离子引擎。

作文

The concept of exhaust velocity is crucial in the field of rocketry and propulsion systems. Understanding this term can significantly enhance our knowledge of how rockets operate and the principles that govern their performance. Exhaust velocity refers to the speed at which the propellant exits the rocket engine. It is a key factor that determines the efficiency and thrust of a rocket. The higher the exhaust velocity, the more effective the propulsion system is in generating thrust. When a rocket launches, it expels gases produced by the combustion of fuel. These gases are expelled at high speeds, and the exhaust velocity is a measure of that speed. The relationship between the mass flow rate of the propellant and the exhaust velocity plays a significant role in the rocket's overall performance. According to the Tsiolkovsky rocket equation, the change in velocity of the rocket is directly proportional to the natural logarithm of the ratio of the initial mass to the final mass of the rocket, multiplied by the exhaust velocity. This equation highlights the importance of optimizing both the mass of the rocket and the exhaust velocity for successful missions.Different types of rocket engines achieve varying exhaust velocities. For instance, chemical rockets typically have lower exhaust velocities compared to nuclear thermal or electric propulsion systems. Chemical rockets, which rely on the combustion of fuel and oxidizer, can achieve exhaust velocities ranging from 2,500 to 4,500 meters per second. In contrast, nuclear thermal rockets can reach exhaust velocities of up to 9,000 meters per second, offering greater efficiency for long-duration space missions.The significance of exhaust velocity extends beyond just the mechanics of rocket propulsion; it also impacts mission planning and design. Engineers must carefully consider the exhaust velocity when designing a rocket to ensure that it can achieve the desired orbit or reach specific destinations in space. For example, missions to Mars require rockets with high exhaust velocities to overcome Earth's gravitational pull and travel the vast distances involved. Moreover, the exhaust velocity is not only about speed; it also relates to the energy efficiency of the propulsion system. A higher exhaust velocity means that the rocket can carry less fuel for the same amount of thrust, which is essential for reducing the overall weight of the spacecraft. This reduction in weight allows for more payload capacity, enabling missions to carry scientific instruments, supplies, or even crew members.In conclusion, understanding the concept of exhaust velocity is fundamental for anyone interested in aerospace engineering or space exploration. It encapsulates the principles of how rockets propel themselves into space and the various factors that influence their performance. By optimizing exhaust velocity, engineers can design more efficient rockets that can accomplish ambitious missions, pushing the boundaries of our exploration of the universe. As we continue to advance in technology and explore new frontiers, the importance of exhaust velocity will remain a cornerstone of rocket science and engineering.

“排气速度”这一概念在火箭和推进系统领域至关重要。理解这个术语可以显著增强我们对火箭如何运作及其性能所遵循的原则的知识。“排气速度”指的是推进剂从火箭发动机中排出的速度。这是决定火箭效率和推力的关键因素。“排气速度”越高，推进系统在产生推力方面就越有效。当火箭发射时，它会排出由燃料燃烧产生的气体。这些气体以高速排出，而“排气速度”则是这一速度的度量。推进剂的质量流量与“排气速度”之间的关系在火箭的整体性能中起着重要作用。根据齐奥尔科夫斯基火箭方程，火箭的速度变化与火箭的初始质量与最终质量的比率的自然对数成正比，并乘以“排气速度”。这个方程突显了优化火箭的质量和“排气速度”对于成功任务的重要性。不同类型的火箭发动机实现不同的“排气速度”。例如，化学火箭的“排气速度”通常低于核热或电推进系统。依赖于燃料和氧化剂燃烧的化学火箭，其“排气速度”范围通常在2500到4500米每秒之间。相比之下，核热火箭的“排气速度”可以达到9000米每秒，为长时间的太空任务提供更高的效率。“排气速度”的重要性不仅仅体现在火箭推进的机械原理上；它还影响着任务规划和设计。工程师在设计火箭时必须仔细考虑“排气速度”，以确保它能够实现所需的轨道或到达特定的太空目的地。例如，前往火星的任务需要具备高“排气速度”的火箭，以克服地球的引力并穿越广阔的距离。此外，“排气速度”不仅关乎速度；它还与推进系统的能量效率相关。“排气速度”越高，火箭就可以携带更少的燃料以获得相同的推力，这对于减少航天器的整体重量至关重要。这种重量的减少使得更多的有效载荷得以搭载，从而使任务能够携带科学仪器、补给品甚至宇航员。总之，理解“排气速度”的概念对于任何对航天工程或太空探索感兴趣的人来说都是基础。它概括了火箭如何推进自己进入太空的原理以及影响其性能的各种因素。通过优化“排气速度”，工程师可以设计出更高效的火箭，能够完成雄心勃勃的任务，推动我们对宇宙探索的边界。随着我们在技术上的不断进步和对新前沿的探索，“排气速度”的重要性将始终是火箭科学和工程的基石。