loop scavenging

简明释义

回哩气

英英释义

例句

1.The engine's efficiency improved due to the implementation of loop scavenging.

由于实施了循环清扫，发动机的效率得到了提升。

2.The use of loop scavenging can reduce exhaust emissions significantly.

使用循环清扫可以显著减少废气排放。

3.Engine designers often consider loop scavenging techniques to optimize performance.

发动机设计师通常考虑采用循环清扫技术来优化性能。

4.In two-stroke engines, loop scavenging is crucial for enhancing power output.

在二冲程发动机中，循环清扫对提高功率输出至关重要。

5.Many racing motorcycles utilize loop scavenging for better acceleration.

许多赛车摩托车利用循环清扫来获得更好的加速性能。

作文

In the world of internal combustion engines, the efficiency and performance of the engine are paramount. One of the critical processes that significantly influences these factors is the method of scavenging used in two-stroke engines. Among various scavenging methods, loop scavenging is particularly notable for its effectiveness in enhancing engine performance. This process involves the movement of the fresh air-fuel mixture through the cylinder in a looping manner, which helps to expel the exhaust gases efficiently and allows for a more complete combustion cycle.To understand loop scavenging, we first need to explore how it differs from other scavenging methods, such as cross scavenging. In cross scavenging, the fresh charge enters from one side of the cylinder and exits from the opposite side, creating a direct path for the gases. However, this method can lead to poor mixing of the fresh charge and exhaust gases, resulting in incomplete combustion and reduced efficiency. In contrast, loop scavenging utilizes the shape of the cylinder and the positioning of the intake and exhaust ports to create a swirling motion of the air-fuel mixture. This design allows the incoming charge to effectively push out the residual exhaust gases, leading to better mixing and combustion.The advantages of loop scavenging are evident in its ability to improve the overall power output of the engine. By ensuring that the exhaust gases are expelled more thoroughly, the engine can take in a larger volume of the fresh charge during each cycle. This increased intake not only enhances power but also contributes to a smoother operation, reducing the likelihood of engine knocking and improving fuel efficiency.Moreover, loop scavenging is particularly beneficial in applications where engine weight and size are critical, such as in motorcycles and small machinery. The compact design of two-stroke engines utilizing this scavenging method allows for lighter and more powerful engines compared to their four-stroke counterparts. This has made loop scavenging a popular choice in various industries, including automotive and marine applications.However, despite its advantages, loop scavenging also presents some challenges. One of the primary concerns is the potential for increased emissions due to unburned fuel escaping along with the exhaust gases. Manufacturers are continually working on improving the design of the scavenging ports and optimizing the timing of the intake and exhaust valves to minimize these emissions. Additionally, advancements in fuel technology and engine management systems are helping to mitigate these issues, making loop scavenging an even more viable option for modern engines.In conclusion, loop scavenging plays a crucial role in the performance and efficiency of two-stroke engines. Its unique design allows for better expulsion of exhaust gases and improved mixing of the air-fuel charge, leading to enhanced power output and smoother operation. While there are challenges associated with this scavenging method, ongoing advancements in technology continue to address these issues, making loop scavenging a significant aspect of modern engine design. As the automotive industry evolves, understanding and implementing effective scavenging techniques like loop scavenging will remain essential for achieving optimal engine performance and meeting environmental standards.

在内燃机的世界中，发动机的效率和性能至关重要。影响这些因素的关键过程之一是两冲程发动机使用的排气方法。在各种排气方法中，loop scavenging（环形排气）因其在提高发动机性能方面的有效性而特别引人注目。该过程涉及新鲜空气-燃料混合物通过气缸以环形方式移动，这有助于有效排出废气并允许更完全的燃烧周期。要理解loop scavenging，我们首先需要探讨它与其他排气方法（如交叉排气）的不同之处。在交叉排气中，新鲜混合气从气缸的一侧进入并从对侧排出，形成气体的直接流动路径。然而，这种方法可能导致新鲜混合气与废气混合不良，导致燃烧不完全和效率降低。相比之下，loop scavenging利用气缸的形状以及进气口和排气口的位置，创造出空气-燃料混合物的旋转运动。这种设计使得进入的混合气能够有效地推动残留的废气，从而实现更好的混合和燃烧。loop scavenging的优点在于其能够提高发动机的整体功率输出。通过确保废气得到更彻底的排出，发动机在每个循环中可以吸入更大体积的新鲜混合气。这种增加的进气不仅增强了功率，还促进了更平稳的运行，减少了发动机敲击的可能性，提高了燃料效率。此外，loop scavenging在发动机重量和体积至关重要的应用中尤为有利，例如摩托车和小型机械。采用这种排气方法的两冲程发动机紧凑的设计使其能够比四冲程发动机更轻且更强大。这使得loop scavenging成为汽车和船舶等多个行业的热门选择。然而，尽管有其优势，loop scavenging也面临一些挑战。其中一个主要问题是由于未燃油料随废气逸出而可能导致排放增加。制造商们不断致力于改进排气口的设计，并优化进气和排气阀的时机，以尽量减少这些排放。此外，燃料技术和发动机管理系统的进步正在帮助缓解这些问题，使得loop scavenging成为现代发动机的更可行选择。总之，loop scavenging在两冲程发动机的性能和效率中扮演着至关重要的角色。其独特的设计允许更好地排出废气和改善空气-燃料混合物的混合，从而提高功率输出和运行平稳性。尽管与这种排气方法相关的挑战仍然存在，但技术的不断进步继续解决这些问题，使得loop scavenging成为现代发动机设计的重要方面。随着汽车工业的发展，理解和实施有效的排气技术，如loop scavenging，将继续对实现最佳发动机性能和满足环境标准至关重要。