expansion stroke

简明释义

膨胀行程

英英释义

例句

1.In a four-stroke engine, the expansion stroke is crucial for converting thermal energy into mechanical work.

在四冲程发动机中，膨胀冲程对将热能转化为机械功至关重要。

2.Engine designers focus on optimizing the expansion stroke to improve overall performance.

发动机设计师专注于优化膨胀冲程以提高整体性能。

3.The efficiency of a steam engine largely depends on the design of its expansion stroke.

蒸汽机的效率在很大程度上取决于其膨胀冲程的设计。

4.During the engine's expansion stroke, the piston moves down, increasing the volume in the cylinder.

在发动机的膨胀冲程中，活塞向下移动，增大了气缸中的体积。

5.The expansion stroke allows the gas to do work on the piston as it expands.

膨胀冲程使气体在扩张时对活塞做功。

作文

The concept of the expansion stroke is fundamental in understanding how internal combustion engines operate. In simple terms, the expansion stroke refers to the phase in the engine cycle where the gases produced from the combustion process expand and push the piston downwards. This stroke is crucial because it converts the chemical energy stored in fuel into mechanical energy that powers the vehicle. Without this phase, the engine would not function effectively, and the vehicle would not be able to move. During the expansion stroke, the piston moves from the top dead center (TDC) to the bottom dead center (BDC). At this point, the combustion chamber has already ignited the fuel-air mixture, creating high-pressure gases. As these gases expand, they exert force on the piston, causing it to descend. This movement is what ultimately turns the crankshaft and drives the wheels of the vehicle. The efficiency of the expansion stroke can significantly impact the overall performance of the engine. If the gases do not expand sufficiently, or if the piston does not move smoothly, the engine will lose power and efficiency. Various factors can affect this process, including the design of the combustion chamber, the timing of the ignition, and the quality of the fuel used. Engineers spend a considerable amount of time optimizing these variables to ensure that the expansion stroke occurs as effectively as possible. In addition to its role in traditional gasoline engines, the expansion stroke is also relevant in diesel engines and other types of internal combustion engines. Each type of engine may have different characteristics during this phase, but the underlying principle remains the same: expanding gases create force that drives the piston. Furthermore, understanding the expansion stroke is not only important for engineers but also for car enthusiasts and anyone interested in how their vehicles work. By knowing how the expansion stroke contributes to engine performance, drivers can make more informed decisions about maintenance and upgrades. For instance, using higher-quality fuel can improve combustion efficiency, leading to a more effective expansion stroke. In conclusion, the expansion stroke is a critical component of the internal combustion engine cycle. It is during this phase that the engine transforms the energy from fuel into motion. Understanding this process can provide valuable insights into automotive technology and help individuals appreciate the complexities of modern engines. As technology continues to advance, the principles governing the expansion stroke will likely evolve, leading to even more efficient and powerful engines in the future.

“膨胀冲程”这一概念是理解内燃机如何运作的基础。简单来说，膨胀冲程指的是发动机循环中气体从燃烧过程中产生并膨胀，推动活塞向下移动的阶段。这个冲程至关重要，因为它将储存在燃料中的化学能转化为驱动车辆的机械能。如果没有这个阶段，发动机将无法有效运作，车辆也无法移动。在膨胀冲程中，活塞从上死点（TDC）移动到下死点（BDC）。此时，燃烧室已经点燃了燃油-空气混合物，产生了高压气体。随着这些气体膨胀，它们对活塞施加力量，导致其下降。这一运动最终使曲轴转动，从而驱动车辆的轮子。膨胀冲程的效率会显著影响发动机的整体性能。如果气体膨胀不足，或者活塞运动不平稳，发动机将会失去动力和效率。各种因素都可能影响这一过程，包括燃烧室的设计、点火的时机以及所用燃料的质量。工程师们花费大量时间优化这些变量，以确保膨胀冲程尽可能有效地进行。除了在传统汽油发动机中的作用外，膨胀冲程在柴油发动机和其他类型的内燃机中同样相关。每种类型的发动机在这一阶段可能具有不同的特性，但基本原理保持不变：膨胀气体产生的力量驱动活塞。此外，理解膨胀冲程不仅对工程师重要，对汽车爱好者和任何对车辆工作原理感兴趣的人也很重要。通过了解膨胀冲程如何影响发动机性能，驾驶者可以做出更明智的维护和升级决策。例如，使用更高质量的燃料可以提高燃烧效率，从而使膨胀冲程更加有效。总之，膨胀冲程是内燃机循环中的一个关键组成部分。在这一阶段，发动机将燃料中的能量转化为运动。理解这一过程可以为汽车技术提供宝贵的见解，并帮助个人欣赏现代发动机的复杂性。随着技术的不断进步，支配膨胀冲程的原则可能会发展，从而在未来带来更高效、更强大的发动机。