cylinder scavenging

简明释义

汽缸扫气

英英释义

例句

1.Engine designers focus on cylinder scavenging to reduce emissions and improve fuel economy.

发动机设计师专注于气缸清扫以减少排放和提高燃油经济性。

2.In two-stroke engines, proper cylinder scavenging is crucial for maximizing power output.

在二冲程发动机中，适当的气缸清扫对最大化功率输出至关重要。

3.The study analyzed various techniques for enhancing cylinder scavenging in diesel engines.

该研究分析了增强柴油发动机气缸清扫的各种技术。

4.The efficiency of the engine can be improved by optimizing the cylinder scavenging process.

通过优化气缸清扫过程，可以提高发动机的效率。

5.Poor cylinder scavenging can lead to unburned fuel and increased pollution.

糟糕的气缸清扫可能导致未燃烧的燃料和增加的污染。

作文

Cylinder scavenging is a critical process in the operation of two-stroke engines, which are commonly used in various applications such as motorcycles, lawn mowers, and marine vessels. In this context, cylinder scavenging refers to the method by which exhaust gases are expelled from the combustion chamber and replaced with a fresh air-fuel mixture. This process is essential for maintaining engine efficiency and performance. Unlike four-stroke engines, which have distinct intake, compression, power, and exhaust strokes, two-stroke engines combine these processes into a single cycle. As a result, effective cylinder scavenging is crucial for ensuring that the engine can run smoothly and produce maximum power.The mechanics of cylinder scavenging involve several factors, including the design of the engine, the timing of the intake and exhaust ports, and the type of fuel used. One common method of scavenging is known as 'loop scavenging,' where fresh air enters the cylinder from the bottom and pushes the exhaust gases out through the top. This method can be highly effective but requires precise timing to ensure that the incoming air does not mix with the exhaust gases, which could lead to incomplete combustion and reduced power output.Another method is 'cross scavenging,' where the fresh charge enters from one side of the cylinder and exits through the opposite side. This approach can also be effective, but it may require a more complex engine design to optimize the flow of gases. Regardless of the method used, the goal of cylinder scavenging remains the same: to clear the combustion chamber of exhaust gases and allow for the introduction of a fresh air-fuel mixture. The efficiency of cylinder scavenging can significantly impact overall engine performance. Poor scavenging can lead to a phenomenon known as 'scavenging loss,' where unburned fuel escapes with the exhaust gases, resulting in decreased power and increased emissions. This is particularly problematic in two-stroke engines, which already have higher emissions compared to their four-stroke counterparts due to their design. Therefore, engineers continually seek ways to improve scavenging efficiency through better port designs, improved fuel formulations, and advanced technologies such as electronic fuel injection.In recent years, there has been a growing interest in the environmental impact of two-stroke engines, leading to innovations aimed at reducing emissions while maintaining performance. Enhanced cylinder scavenging techniques, combined with cleaner fuel options, can help mitigate the negative effects associated with these engines. For instance, some manufacturers are exploring the use of direct fuel injection systems that can optimize the air-fuel mixture entering the cylinder, thereby improving combustion efficiency and reducing pollutants.In conclusion, cylinder scavenging plays a vital role in the functioning of two-stroke engines, influencing their efficiency and environmental impact. Understanding the intricacies of this process is essential for engineers and manufacturers looking to enhance engine performance while adhering to stricter emission regulations. As technology continues to evolve, the future of two-stroke engines will likely depend on advancements in scavenging techniques and fuel technologies, paving the way for cleaner and more efficient engines in various applications.

气缸清扫是两冲程发动机运作中的一个关键过程，这种发动机广泛应用于摩托车、割草机和船舶等多种场合。在这个背景下，气缸清扫指的是将废气从燃烧室排出并用新鲜的空气-燃料混合物替代的方法。这个过程对于维持发动机的效率和性能至关重要。与四冲程发动机不同，四冲程发动机具有独立的进气、压缩、做功和排气冲程，而两冲程发动机将这些过程合并为一个循环。因此，有效的气缸清扫对于确保发动机平稳运行和产生最大功率至关重要。气缸清扫的机械原理涉及多个因素，包括发动机的设计、进气和排气口的时机以及所使用的燃料类型。一种常见的清扫方法被称为“环形清扫”，其中新鲜空气从底部进入气缸，并将废气从顶部推出。这种方法可以非常有效，但需要精确的时机，以确保进入的空气不会与废气混合，这可能导致燃烧不完全和功率输出降低。另一种方法是“交叉清扫”，新鲜混合气体从气缸一侧进入，并从对面侧排出。这种方法也可以有效，但可能需要更复杂的发动机设计来优化气体的流动。无论使用哪种方法，气缸清扫的目标始终是相同的：清除燃烧室中的废气，并允许引入新鲜的空气-燃料混合物。气缸清扫的效率对整体发动机性能有显著影响。清扫不良会导致一种现象，称为“清扫损失”，即未燃烧的燃料与废气一起逃逸，导致功率下降和排放增加。这在两冲程发动机中尤其成问题，因为由于其设计，它们的排放量本就高。因此，工程师们不断寻求通过更好的气口设计、改进的燃料配方和先进技术（如电子燃油喷射）来提高清扫效率。近年来，随着人们对两冲程发动机环境影响的日益关注，创新的出现旨在减少排放，同时保持性能。增强的气缸清扫技术结合更清洁的燃料选项，可以帮助减轻与这些发动机相关的负面影响。例如，一些制造商正在探索使用直接燃油喷射系统，该系统可以优化进入气缸的空气-燃料混合物，从而提高燃烧效率并减少污染物。总之，气缸清扫在两冲程发动机的功能中起着至关重要的作用，影响其效率和环境影响。理解这一过程的细节对于希望提高发动机性能并遵守更严格排放法规的工程师和制造商至关重要。随着技术的不断发展，两冲程发动机的未来可能依赖于清扫技术和燃料技术的进步，为各种应用中的更清洁、更高效的发动机铺平道路。