stagnation enthalpy

简明释义

滞止焓

英英释义

例句

1.The calculation of the stagnation enthalpy 停滞焓 is essential for determining the performance of jet engines.

计算停滞焓是确定喷气发动机性能的关键。

2.The stagnation enthalpy 停滞焓 is a critical parameter in thermodynamic cycles.

在热力学循环中，停滞焓是一个关键参数。

3.Engine designers often consider stagnation enthalpy 停滞焓 when optimizing fuel efficiency.

发动机设计师在优化燃油效率时常常考虑停滞焓。

4.In supersonic flight, the stagnation enthalpy 停滞焓 helps in analyzing shock wave interactions.

在超音速飞行中，停滞焓有助于分析冲击波的相互作用。

5.The stagnation enthalpy 停滞焓 can be calculated from the total temperature and pressure at the inlet.

可以通过入口的总温度和压力计算出停滞焓。

作文

In the study of thermodynamics and fluid mechanics, the concept of stagnation enthalpy is crucial for understanding energy transformations in flowing fluids. Stagnation enthalpy refers to the total energy per unit mass of a fluid when it is brought to rest isentropically, meaning without any loss of energy due to friction or heat transfer. This concept is particularly important in aerospace engineering, where the behavior of air at high speeds can significantly impact the performance of aircraft and spacecraft.To elaborate, when a fluid flows, it possesses both kinetic and potential energy. The kinetic energy arises from its motion, while potential energy is associated with its elevation in a gravitational field. However, when we consider the stagnation enthalpy, we are interested in the scenario where the fluid is brought to a complete stop. At this point, all the kinetic energy is converted into internal energy, which can be expressed mathematically as the sum of the static enthalpy and the dynamic pressure of the fluid.The formula for stagnation enthalpy can be represented as follows: H0 = h + (V^2 / 2),where H0 is the stagnation enthalpy, h is the static enthalpy, and V is the flow velocity. This equation shows that the stagnation enthalpy is directly influenced by the speed of the fluid; as the speed increases, so does the kinetic energy, which subsequently increases the stagnation enthalpy. In practical applications, the knowledge of stagnation enthalpy allows engineers to design more efficient propulsion systems. For example, in jet engines, understanding how air behaves at various speeds and temperatures is essential for optimizing the engine's performance. By calculating the stagnation enthalpy, engineers can determine how much energy is available for thrust and how to manage the thermal conditions within the engine to prevent overheating.Moreover, stagnation enthalpy plays a vital role in the analysis of shock waves in supersonic flight. When an aircraft exceeds the speed of sound, shock waves form, leading to abrupt changes in pressure and temperature. By evaluating the stagnation enthalpy before and after the shock wave, engineers can predict the effects on the aircraft's performance and structural integrity. This analysis is crucial for developing safe and effective designs for high-speed vehicles.In conclusion, the concept of stagnation enthalpy is fundamental in the fields of thermodynamics and fluid mechanics. It provides valuable insights into the energy dynamics of moving fluids and is instrumental in the design and optimization of various engineering systems, particularly in aerospace applications. Understanding stagnation enthalpy not only enhances our comprehension of fluid behavior but also contributes to advancements in technology that rely on efficient energy use and management. As we continue to explore the boundaries of aerodynamics and propulsion, the importance of stagnation enthalpy will undoubtedly grow, paving the way for innovations in transportation and energy systems.

在热力学和流体力学的研究中，停滞焓的概念对于理解流动流体中的能量转化至关重要。停滞焓指的是流体在绝热条件下被完全停止时每单位质量的总能量，这意味着没有因摩擦或热传递而导致的能量损失。这个概念在航空航天工程中尤为重要，因为高速空气的行为会显著影响飞机和航天器的性能。具体来说，当流体流动时，它具有动能和势能。动能源于它的运动，而势能则与其在重力场中的高度相关。然而，当我们考虑停滞焓时，我们关注的是流体完全停止的情况。在这一点上，所有的动能都转化为内能，可以用静态焓和流体的动态压力之和来表示。停滞焓的公式可以表示为：H0 = h + (V^2 / 2)，其中H0是停滞焓，h是静态焓，V是流速。这个方程表明，停滞焓直接受流体速度的影响；随着速度的增加，动能也增加，从而增加了停滞焓。在实际应用中，了解停滞焓使工程师能够设计更高效的推进系统。例如，在喷气发动机中，理解空气在不同速度和温度下的行为对于优化发动机性能至关重要。通过计算停滞焓，工程师可以确定可用于推力的能量以及如何管理发动机内部的热条件以防止过热。此外，停滞焓在超音速飞行中的冲击波分析中也发挥着重要作用。当飞机超过音速时，会形成冲击波，导致压力和温度的急剧变化。通过评估冲击波前后的停滞焓，工程师可以预测对飞机性能和结构完整性的影响。这种分析对于开发安全有效的高速飞行器设计至关重要。总之，停滞焓的概念在热力学和流体力学领域是基础。它提供了对流动流体能量动态的重要见解，并在各种工程系统的设计和优化中发挥了重要作用，尤其是在航空航天应用中。理解停滞焓不仅增强了我们对流体行为的理解，还促进了依赖于高效能源使用和管理的技术进步。随着我们继续探索空气动力学和推进的边界，停滞焓的重要性无疑会增加，为运输和能源系统的创新铺平道路。