Rankine cycle

简明释义

蒸汽循环

英英释义

例句

1.To analyze the performance of the Rankine cycle 兰金循环, engineers use thermodynamic principles.

为了分析兰金循环的性能，工程师们使用热力学原理。

2.In a typical Rankine cycle 兰金循环, water is heated to produce steam that drives a turbine.

在典型的兰金循环中，水被加热以产生蒸汽，从而驱动涡轮。

3.Many power plants utilize the Rankine cycle 兰金循环 to convert heat energy into mechanical work.

许多发电厂利用兰金循环将热能转化为机械功。

4.The efficiency of the Rankine cycle 兰金循环 can be improved by increasing the boiler pressure.

通过提高锅炉压力，可以提高兰金循环的效率。

5.The Rankine cycle 兰金循环 is often used in geothermal power generation.

在地热发电中，兰金循环通常被使用。

作文

The Rankine cycle is a thermodynamic cycle that converts heat into mechanical work, and it is widely used in power generation. Named after the Scottish engineer William John Macquorn Rankine, this cycle operates on the principle of converting thermal energy into work through a series of processes involving phase changes of a working fluid. The Rankine cycle consists of four main processes: isentropic compression, isobaric heat addition, isentropic expansion, and isobaric heat rejection.In the first process, isentropic compression, the working fluid, typically water, is pumped from a low-pressure state to a high-pressure state. During this phase, the temperature of the liquid increases slightly due to the pressure increase, but there is no heat added to the fluid, which keeps the entropy constant. This process is essential as it prepares the working fluid for the next stage, where it will absorb heat.The second process involves isobaric heat addition, where the high-pressure liquid enters a boiler. Here, the liquid absorbs heat from an external source, such as burning fossil fuels or solar energy, causing it to vaporize and become a high-pressure steam. This step is crucial because it transforms the liquid into a gas, which can expand and perform work.Next is the isentropic expansion process, where the high-pressure steam enters a turbine. As the steam expands, it does work on the turbine blades, causing them to rotate. This mechanical work is what ultimately drives generators to produce electricity. During this expansion, the steam's pressure and temperature drop, but the process remains adiabatic, meaning no heat is exchanged with the surroundings.Finally, the cycle concludes with isobaric heat rejection. The low-pressure steam exiting the turbine enters a condenser, where it releases heat to a cooling medium, often water or air. This heat rejection causes the steam to condense back into a liquid state, completing the cycle. The liquid is then pumped back to the boiler, and the cycle starts again.One of the significant advantages of the Rankine cycle is its efficiency in converting thermal energy into mechanical energy. However, the efficiency can be affected by factors such as the temperature difference between the heat source and sink, as well as the properties of the working fluid. To improve the cycle's efficiency, modifications such as reheating and regeneration can be implemented.In conclusion, the Rankine cycle is a fundamental concept in thermodynamics and plays a critical role in modern power generation systems. Understanding this cycle helps engineers design more efficient power plants and develop technologies that harness energy more effectively. As the world continues to seek sustainable energy solutions, advancements in Rankine cycle technology will be vital in reducing our reliance on fossil fuels and minimizing environmental impacts.

Rankine cycle 是一个热力学循环，将热能转化为机械功，广泛应用于发电。该循环以苏格兰工程师威廉·约翰·麦夸恩·兰金的名字命名，基于将热能通过工作流体的相变转化为功的原理。Rankine cycle 由四个主要过程组成：等熵压缩、等压加热、等熵膨胀和等压排热。在第一个过程中，即等熵压缩中，工作流体（通常是水）从低压状态被泵送到高压状态。在此阶段，液体的温度因压力升高而略微增加，但没有热量添加到流体中，这使得熵保持不变。这个过程至关重要，因为它为下一个阶段做准备，使工作流体能够吸收热量。第二个过程涉及等压加热，高压液体进入锅炉。在这里，液体从外部热源（如燃烧化石燃料或太阳能）吸收热量，导致其蒸发并成为高压蒸汽。这个步骤至关重要，因为它将液体转化为气体，使其能够膨胀并执行功。接下来是等熵膨胀过程，高压蒸汽进入涡轮。在蒸汽膨胀的过程中，它对涡轮叶片做功，导致其旋转。这种机械功最终驱动发电机产生电力。在此膨胀过程中，蒸汽的压力和温度下降，但该过程保持绝热，意味着与周围环境没有热量交换。最后，循环以等压排热结束。低压蒸汽从涡轮排出后进入冷凝器，在那里它向冷却介质（通常是水或空气）释放热量。这个热量的释放使蒸汽重新凝结成液体状态，从而完成循环。液体随后被泵送回锅炉，循环再次开始。Rankine cycle 的一个显著优势是其在将热能转化为机械能方面的高效率。然而，效率可能受到热源与热汇之间的温差以及工作流体特性的影响。为了提高循环的效率，可以实施再加热和再生等改进。总之，Rankine cycle 是热力学中的基本概念，在现代发电系统中扮演着关键角色。理解这一循环有助于工程师设计更高效的发电厂并开发更有效利用能源的技术。随着世界继续寻求可持续能源解决方案，Rankine cycle 技术的进步将对减少我们对化石燃料的依赖和最小化环境影响至关重要。