diesel cycle

简明释义

狄塞尔循环

英英释义

例句

1.The efficiency of the diesel cycle is higher than that of the Otto cycle in many applications.

在许多应用中，柴油循环的效率高于奥托循环。

2.Understanding the diesel cycle can help engineers design more efficient engines.

理解柴油循环可以帮助工程师设计更高效的发动机。

3.In a diesel cycle, the air is compressed to a much higher pressure than in gasoline engines.

在柴油循环中，空气被压缩到比汽油发动机高得多的压力。

4.The diesel cycle operates on the principle of compression ignition.

柴油循环基于压缩点火的原理运行。

5.Many heavy-duty vehicles utilize the diesel cycle for better fuel efficiency.

许多重型车辆利用柴油循环来提高燃油效率。

作文

The diesel cycle is a thermodynamic cycle that describes the functioning of a diesel engine, which is widely used in various applications ranging from automobiles to industrial machinery. Understanding the diesel cycle is crucial for anyone interested in mechanical engineering or automotive technology, as it highlights the principles of energy conversion and efficiency in internal combustion engines.At its core, the diesel cycle consists of four distinct processes: adiabatic compression, constant pressure heat addition, adiabatic expansion, and constant volume heat rejection. During the first stage, the air is compressed adiabatically, meaning that no heat is exchanged with the surroundings. This compression raises the temperature and pressure of the air significantly. The high temperature is essential because it allows for the ignition of fuel without the need for a spark plug, which is a defining characteristic of diesel engines.Next, in the second phase of the diesel cycle, fuel is injected into the compressed air, where it ignites due to the high temperature. This process occurs at constant pressure, leading to an increase in the volume of gas and thus generating power. The ability of diesel engines to operate on this principle is a significant advantage, as it provides higher thermal efficiency compared to gasoline engines.The third stage involves adiabatic expansion, where the high-pressure gases expand and do work on the piston, converting thermal energy into mechanical energy. This expansion drives the vehicle or powers the machinery, showcasing the effectiveness of the diesel cycle in energy conversion.Finally, the cycle concludes with constant volume heat rejection, where the exhaust gases are expelled from the cylinder, and the engine returns to its initial state, ready to start the cycle anew. The efficiency of the diesel cycle can be attributed to its higher compression ratios and the properties of diesel fuel, which has a higher energy content than gasoline.In comparison to other cycles, such as the Otto cycle used in gasoline engines, the diesel cycle offers several advantages. Diesel engines tend to be more fuel-efficient and produce more torque at lower RPMs, making them ideal for heavy-duty applications like trucks and buses. Additionally, the longevity and durability of diesel engines contribute to their popularity in commercial transportation.However, the diesel cycle is not without its challenges. Diesel engines have historically been associated with higher emissions of nitrogen oxides (NOx) and particulate matter, leading to environmental concerns. Modern advancements in technology, including turbocharging, intercooling, and after-treatment systems, have been developed to mitigate these issues, making diesel engines cleaner and more efficient than ever before.In conclusion, the diesel cycle is a fundamental concept in understanding how diesel engines operate and their role in modern transportation and industry. By grasping the intricacies of this cycle, one can appreciate the engineering marvels that allow these engines to function efficiently and effectively. As we move towards a more sustainable future, the innovations surrounding the diesel cycle will continue to evolve, ensuring that diesel technology remains relevant in a world increasingly focused on reducing emissions and improving fuel economy.

柴油循环是一个热力学循环，描述了柴油发动机的运作，这种发动机广泛应用于从汽车到工业机械的各种场合。理解柴油循环对于任何对机械工程或汽车技术感兴趣的人来说都是至关重要的，因为它突出了内部燃烧发动机中能量转换和效率的原理。在其核心，柴油循环由四个不同的过程组成：绝热压缩、恒压加热、绝热膨胀和恒容排热。在第一阶段，空气被绝热压缩，这意味着与周围环境没有热量交换。这种压缩显著提高了空气的温度和压力。高温是必不可少的，因为它允许燃料在没有火花塞的情况下点燃，这是柴油发动机的一个定义特征。接下来，在柴油循环的第二阶段，燃料被注入到压缩空气中，在高温下点燃。这一过程在恒压下进行，导致气体体积增加，从而产生动力。柴油发动机能够在这一原理下运行是一个重要的优势，因为它提供了比汽油发动机更高的热效率。第三阶段涉及绝热膨胀，高压气体膨胀并对活塞做功，将热能转化为机械能。这种膨胀推动车辆或为机械提供动力，展示了柴油循环在能量转换中的有效性。最后，循环以恒容排热结束，废气从气缸中排出，发动机恢复到其初始状态，准备重新开始循环。柴油循环的效率可以归因于其较高的压缩比和柴油燃料的特性，后者的能量含量高于汽油。与其他循环（如用于汽油发动机的奥托循环）相比，柴油循环提供了几个优势。柴油发动机通常更为节能，并且在较低转速下产生更多扭矩，使其非常适合于重型应用，如卡车和公共汽车。此外，柴油发动机的耐用性和持久性使其在商业运输中备受欢迎。然而，柴油循环也面临着一些挑战。柴油发动机历来与更高的氮氧化物（NOx）和颗粒物排放相关，这引发了环境问题。现代技术的进步，包括涡轮增压、中冷和后处理系统，已被开发出来以减轻这些问题，使柴油发动机比以往任何时候都更加清洁和高效。总之，柴油循环是理解柴油发动机如何运作及其在现代交通和工业中作用的基本概念。通过掌握这一循环的复杂性，人们可以欣赏到这些发动机如何高效而有效地运作的工程奇迹。随着我们朝着更加可持续的未来迈进，围绕柴油循环的创新将继续发展，确保柴油技术在一个日益关注减少排放和提高燃油经济性的世界中保持相关性。