loop scavenging

简明释义

回流扫气

英英释义

例句

1.The design of the cylinder allows for effective loop scavenging.

气缸的设计允许有效的环形清扫。

2.The engine employs loop scavenging to enhance its efficiency.

该发动机采用环形清扫来提高效率。

3.Engineers are exploring new methods to improve loop scavenging in outboard motors.

工程师们正在探索改进舷外发动机中环形清扫的新方法。

4.In two-stroke engines, loop scavenging is crucial for optimal performance.

在二冲程发动机中，环形清扫对最佳性能至关重要。

5.A well-executed loop scavenging process can reduce emissions significantly.

执行良好的环形清扫过程可以显著减少排放。

作文

In the world of internal combustion engines, various techniques are employed to enhance performance and efficiency. One such technique is loop scavenging, which plays a crucial role in the operation of two-stroke engines. Unlike their four-stroke counterparts, two-stroke engines complete a power cycle with every revolution of the crankshaft, making them simpler and lighter. However, this design can lead to inefficiencies, particularly in the way exhaust gases are expelled and fresh air-fuel mixtures are introduced into the combustion chamber.The fundamental principle behind loop scavenging is to create a more effective method for clearing out burnt gases from the previous cycle while simultaneously introducing a new charge of fresh air and fuel. This process typically involves the use of strategically placed ports that allow the incoming mixture to flow in a loop-like motion, hence the term 'loop scavenging.' By optimizing the flow dynamics within the cylinder, this method aims to minimize the loss of unburnt fuel and maximize the power output of the engine.One of the key advantages of loop scavenging is its ability to improve the volumetric efficiency of the engine. Volumetric efficiency refers to the effectiveness with which the engine fills its cylinders with the air-fuel mixture. In a traditional two-stroke engine without effective scavenging, there is a risk of residual exhaust gases remaining in the cylinder, which can dilute the fresh charge and lead to incomplete combustion. This not only reduces power output but also increases emissions, which is a significant concern in today's environmentally conscious world.By employing loop scavenging, engineers can design engines that achieve better mixing of the incoming charge and more thorough removal of exhaust gases. This results in a cleaner burn and improved performance characteristics. Furthermore, the design of the scavenging ports can be optimized to enhance the swirl and turbulence of the air-fuel mixture, leading to more efficient combustion and higher power outputs.However, implementing loop scavenging is not without its challenges. The design and placement of the ports must be carefully calibrated to ensure that the scavenging process does not interfere with the intake and exhaust cycles. If the timing is off, it could lead to backflow of exhaust gases or insufficient fresh charge entering the cylinder, negating the benefits of the scavenging technique. Additionally, the complexity of the engine design may increase manufacturing costs, which is a consideration for automotive manufacturers.In conclusion, loop scavenging represents a significant advancement in the field of two-stroke engine technology. By improving the efficiency of the scavenging process, this technique allows for better performance, reduced emissions, and a more environmentally friendly approach to engine design. As the automotive industry continues to evolve, understanding and mastering techniques like loop scavenging will be essential for engineers looking to push the boundaries of what is possible in internal combustion engine performance. The ongoing research and development in this area promise to yield even more innovative solutions that can meet the demands of modern transportation while adhering to stricter environmental regulations.

在内燃机的世界中，采用各种技术来提高性能和效率。其中一种技术是环形清扫，它在二冲程发动机的运行中起着至关重要的作用。与四冲程发动机不同，二冲程发动机每转动一次曲轴就完成一个动力循环，使其结构更简单、重量更轻。然而，这种设计可能导致效率低下，尤其是在废气排放和新鲜空气-燃料混合物引入燃烧室的方式上。环形清扫的基本原理是创造一种更有效的方法，以清除前一个循环中的废气，同时引入新的新鲜空气和燃料混合物。这个过程通常涉及使用战略性布置的端口，使进入的混合物能够以环状运动流动，因此得名“环形清扫”。通过优化气缸内的流动动态，这种方法旨在最小化未燃油的损失并最大化发动机的功率输出。环形清扫的主要优势之一是提高发动机的容积效率。容积效率是指发动机用空气-燃料混合物填充气缸的有效性。在没有有效清扫的传统二冲程发动机中，存在废气残留在气缸内的风险，这可能稀释新鲜混合物并导致不完全燃烧。这不仅降低了功率输出，还增加了排放，这在当今环保意识日益增强的世界中是一个重大问题。通过采用环形清扫，工程师可以设计出更好地混合进入的混合物并更彻底地去除废气的发动机。这导致更清洁的燃烧和改善的性能特征。此外，清扫端口的设计可以优化，以增强空气-燃料混合物的旋涡和湍流，从而实现更高效的燃烧和更高的功率输出。然而，实现环形清扫并非没有挑战。端口的设计和位置必须仔细校准，以确保清扫过程不会干扰进气和排气循环。如果时机不对，可能会导致废气回流或新鲜混合物进入气缸不足，从而抵消清扫技术的好处。此外，发动机设计的复杂性可能会增加制造成本，这是汽车制造商需要考虑的因素。总之，环形清扫代表了二冲程发动机技术领域的一项重大进展。通过改善清扫过程的效率，这种技术允许更好的性能、减少排放以及更环保的发动机设计方法。随着汽车工业的不断发展，理解和掌握像环形清扫这样的技术将是工程师们推动内燃机性能极限的关键。在这一领域持续的研究和开发有望带来更多创新解决方案，以满足现代交通的需求，同时遵循更严格的环境法规。