isentropic change

简明释义

等熵变化

英英释义

例句

1.In a Carnot cycle, the heat transfer occurs at constant temperature and the compression is considered an isentropic change 绝热变化.

在卡诺循环中，热量转移在恒定温度下进行，而压缩被视为一个isentropic change 绝热变化。

2.For an isentropic change 绝热变化, the entropy of the system remains constant.

对于一个isentropic change 绝热变化，系统的熵保持不变。

3.Understanding isentropic change 绝热变化 is crucial for designing efficient refrigeration cycles.

理解isentropic change 绝热变化对于设计高效的制冷循环至关重要。

4.The efficiency of a turbine can be analyzed by comparing the actual process to an isentropic change 绝热变化.

通过将实际过程与isentropic change 绝热变化进行比较，可以分析涡轮的效率。

5.In thermodynamics, an ideal gas undergoes an isentropic change 绝热变化 during a reversible adiabatic process.

在热力学中，理想气体在可逆绝热过程中经历了一个isentropic change 绝热变化。

作文

In the field of thermodynamics, the concept of isentropic change is fundamental to understanding how energy is transferred and transformed in various systems. An isentropic change refers to a process that is both adiabatic and reversible, meaning that there is no heat transfer into or out of the system, and the process can be reversed without any increase in entropy. This idealized process is important because it allows engineers and scientists to analyze real-world systems more effectively by providing a benchmark for efficiency.To illustrate the significance of isentropic change, consider the operation of a gas turbine. In a gas turbine, air is compressed, mixed with fuel, and ignited to produce high-temperature, high-pressure gases that expand through turbines to produce work. The compression and expansion processes ideally should be isentropic changes. During the compression phase, if the process were truly isentropic, all the work done on the gas would be converted into an increase in pressure without any losses due to heat transfer. Similarly, during the expansion phase, the gas would convert all its internal energy back into work without any heat losses.However, in reality, achieving a perfect isentropic change is impossible due to irreversibilities such as friction, turbulence, and heat losses. Therefore, engineers use the concept of isentropic change to calculate the maximum possible efficiency of a gas turbine cycle. By comparing the actual performance with the ideal isentropic model, they can identify areas for improvement and optimize the design.Moreover, the isentropic change can be illustrated using the T-S (temperature-entropy) diagram. In this graphical representation, an isentropic change appears as a vertical line, indicating that the entropy remains constant while the temperature changes. This is a crucial aspect when analyzing cycles such as the Rankine or Brayton cycles, where isentropic changes play a vital role in determining the overall efficiency of the cycle.In conclusion, the concept of isentropic change is essential in thermodynamics, particularly in the analysis and optimization of energy systems. While real processes cannot achieve true isentropic changes, understanding this idealized concept allows engineers to set benchmarks for performance and efficiency. As technology continues to advance, the pursuit of designs that approach isentropic change will remain a key focus in the fields of mechanical and aerospace engineering, ultimately leading to more efficient energy systems and a reduction in environmental impact. The study of isentropic change not only enhances our understanding of thermodynamic processes but also drives innovation in energy technologies that are crucial for sustainable development.

在热力学领域，绝热变化的概念对于理解能量在各种系统中的转移和转化至关重要。绝热变化是指一个既无热传递又可逆的过程，这意味着系统内没有热量的输入或输出，并且该过程可以在不增加熵的情况下逆转。这个理想化的过程之所以重要，是因为它使工程师和科学家能够通过提供效率的基准，更有效地分析现实世界的系统。为了说明绝热变化的重要性，考虑一下燃气轮机的运行。在燃气轮机中，空气被压缩，与燃料混合并点燃，产生高温高压的气体，这些气体通过涡轮膨胀以产生功。理想情况下，压缩和膨胀过程应该是绝热变化。在压缩阶段，如果过程是真正的绝热，那么施加在气体上的所有功都会转化为压力的增加，而不会因热传递而造成任何损失。同样，在膨胀阶段，气体将其内部能量完全转化为功，而不会有任何热损失。然而，实际上，由于摩擦、湍流和热损失等不可逆因素，达到完美的绝热变化是不可能的。因此，工程师使用绝热变化的概念来计算燃气轮机循环的最大可能效率。通过将实际性能与理想的绝热模型进行比较，他们可以识别改进的领域并优化设计。此外，绝热变化可以通过T-S（温度-熵）图进行说明。在这种图形表示中，绝热变化呈现为一条垂直线，表明在温度变化的同时熵保持不变。这在分析如Rankine或Brayton循环等周期时是一个关键方面，在这些周期中，绝热变化在确定循环的整体效率方面发挥着重要作用。总之，绝热变化的概念在热力学中至关重要，特别是在能源系统的分析和优化中。尽管真实过程无法实现真正的绝热变化，但理解这一理想化概念使工程师能够设定性能和效率的基准。随着技术的不断进步，接近绝热变化的设计追求将始终是机械和航空航天工程领域的关键焦点，最终导致更高效的能源系统和环境影响的减少。对绝热变化的研究不仅增强了我们对热力学过程的理解，还推动了对可持续发展至关重要的能源技术的创新。