poppet-valve engine

简明释义

提阀式发动机

英英释义

例句

1.Many modern cars utilize a poppet-valve engine due to its reliability and efficiency.

许多现代汽车使用汽门发动机，因为它的可靠性和效率。

2.The maintenance of a poppet-valve engine requires regular checks on the valve timing.

维护汽门发动机需要定期检查阀门时机。

3.In a racing context, a well-tuned poppet-valve engine can significantly improve lap times.

在赛车背景下，调校良好的汽门发动机可以显著提高圈速。

4.The design of the poppet-valve engine allows for efficient airflow, which is crucial for performance.

设计中的汽门发动机允许高效的气流，这对性能至关重要。

5.The poppet-valve engine is known for its ability to handle high RPMs without losing power.

汽门发动机以其在高转速下不失去动力的能力而闻名。

作文

The development of the internal combustion engine has been one of the most significant advancements in engineering. Among various designs, the poppet-valve engine stands out due to its efficiency and reliability. A poppet-valve engine is an engine that uses valves to control the intake and exhaust of gases. These valves are typically opened and closed by the movement of a camshaft, which is driven by the engine's crankshaft. This design allows for precise timing of the gas exchange process, making it more efficient compared to older designs like the rotary valve engine.The poppet-valve engine operates on the principle of four-stroke cycles: intake, compression, power, and exhaust. During the intake stroke, the intake valve opens to allow a mixture of air and fuel into the combustion chamber. When the piston moves up during the compression stroke, the intake valve closes, sealing the chamber. The mixture is then compressed, and when the piston reaches the top of its stroke, a spark ignites the mixture, causing an explosion that drives the piston down during the power stroke. Finally, the exhaust valve opens, allowing the spent gases to escape during the exhaust stroke.One of the key advantages of the poppet-valve engine is its ability to operate at high speeds. The design of the poppet valves allows them to open and close quickly, which is essential for high RPM performance. This characteristic has made the poppet-valve engine a favorite in both automotive and aviation applications. Moreover, the simplicity of the design contributes to easier maintenance and repairs, which is another reason for its widespread use.However, the poppet-valve engine is not without its drawbacks. One of the main issues is the wear and tear of the valves and seats over time, which can lead to decreased performance and increased emissions. Additionally, the need for precise timing and synchronization of the camshaft and crankshaft can complicate the design and increase manufacturing costs. Despite these challenges, advancements in materials and technology continue to improve the durability and efficiency of poppet-valve engines.In conclusion, the poppet-valve engine has played a crucial role in the evolution of internal combustion engines. Its design allows for efficient gas exchange, high-speed operation, and relatively straightforward maintenance. As engineers continue to innovate and refine this technology, the poppet-valve engine will likely remain a cornerstone of modern engineering, powering everything from cars to airplanes for years to come.

内燃机的发展是工程学中最重要的进步之一。在各种设计中，气门发动机因其效率和可靠性而脱颖而出。气门发动机是一种使用气门来控制气体的进排气的发动机。这些气门通常由凸轮轴的运动开启和关闭，而凸轮轴又由发动机的曲轴驱动。这种设计允许精确的气体交换过程时机，使其比旧设计（如旋转阀发动机）更高效。气门发动机的工作原理是四冲程循环：吸气、压缩、动力和排气。在吸气冲程期间，进气阀打开，允许空气和燃料的混合物进入燃烧室。当活塞在压缩冲程中向上移动时，进气阀关闭，密封燃烧室。然后混合物被压缩，当活塞到达其行程的顶部时，火花点燃混合物，导致爆炸，推动活塞在动力冲程中向下移动。最后，排气阀打开，允许废气在排气冲程中排出。气门发动机的一个关键优点是能够在高速下运行。气门的设计使其能够快速开启和关闭，这对于高转速性能至关重要。这一特性使得气门发动机成为汽车和航空应用中的最爱。此外，设计的简单性有助于更容易的维护和修理，这也是其广泛使用的另一个原因。然而，气门发动机并非没有缺点。主要问题之一是气门和座椅随着时间的推移而磨损，可能导致性能下降和排放增加。此外，凸轮轴和曲轴的精确时机和同步的需求可能会使设计复杂化，并增加制造成本。尽管面临这些挑战，材料和技术的进步仍在不断提高气门发动机的耐用性和效率。总之，气门发动机在内燃机的演变中发挥了关键作用。其设计允许高效的气体交换、高速操作和相对简单的维护。随着工程师们继续创新和改进这一技术，气门发动机很可能仍将是现代工程的基石，未来几年将为汽车和飞机等提供动力。