uniflow scavenging

简明释义

直流扫气

英英释义

例句

1.The engine's efficiency improved significantly after implementing uniflow scavenging (单向排气) technology.

在实施了uniflow scavenging（单向排气）技术后，发动机的效率显著提高。

2.Many modern two-stroke engines utilize uniflow scavenging (单向排气) to enhance performance.

许多现代二冲程发动机利用uniflow scavenging（单向排气）来提高性能。

3.With uniflow scavenging (单向排气), the engine can achieve lower emissions and better fuel efficiency.

通过uniflow scavenging（单向排气），发动机能够实现更低的排放和更好的燃油效率。

4.The design of the cylinder allows for optimal uniflow scavenging (单向排气) during the exhaust phase.

气缸的设计允许在排气阶段实现最佳的uniflow scavenging（单向排气）。

5.The research focused on how uniflow scavenging (单向排气) affects the thermal efficiency of engines.

研究集中在uniflow scavenging（单向排气）如何影响发动机的热效率。

作文

The concept of uniflow scavenging is a pivotal aspect in the engineering of two-stroke engines, which are known for their simplicity and high power-to-weight ratio. In traditional two-stroke engines, the process of scavenging refers to the method by which exhaust gases are expelled from the cylinder and replaced by fresh air-fuel mixture. However, the efficiency of this process can significantly impact the overall performance of the engine. This is where uniflow scavenging comes into play.Uniflow scavenging is characterized by the arrangement where the intake and exhaust ports are located on opposite sides of the cylinder. This design allows for a more direct flow of fresh charge into the combustion chamber while simultaneously expelling the exhaust gases. The primary advantage of uniflow scavenging is that it minimizes the mixing of fresh fuel with exhaust gases, which can lead to incomplete combustion and reduced efficiency.In contrast to other scavenging methods, such as loop scavenging, where the intake and exhaust ports are positioned at the same end of the cylinder, uniflow scavenging provides a more streamlined and efficient way to clear out the cylinder. This is particularly important in applications where performance and emissions are critical, such as in marine engines or high-performance motorcycles.One of the key benefits of uniflow scavenging is its ability to maintain higher cylinder pressures, which can lead to improved power output. By ensuring that the exhaust gases are effectively removed before the new charge enters, the engine can operate at optimal efficiency. This is especially beneficial in racing scenarios where every ounce of power counts. Furthermore, uniflow scavenging can help reduce the amount of unburned hydrocarbons that escape into the atmosphere, thereby lowering the environmental impact of two-stroke engines.The implementation of uniflow scavenging requires precise engineering and design considerations. Manufacturers must carefully calculate the dimensions of the intake and exhaust ports, as well as the timing of their opening and closing. This precision ensures that the engine achieves the desired scavenging efficiency and performance characteristics. Additionally, advancements in technology have allowed for the development of sophisticated control systems that can further optimize the scavenging process in real-time.Despite its advantages, uniflow scavenging is not without challenges. The complexity of the design may increase manufacturing costs, and the need for precise tuning can make maintenance more difficult. However, the benefits often outweigh these drawbacks, particularly in applications where performance is paramount.In conclusion, uniflow scavenging represents a significant advancement in the design of two-stroke engines. Its ability to improve scavenging efficiency, enhance power output, and reduce emissions makes it a desirable feature in modern engine design. As technology continues to evolve, we can expect to see even more innovative applications of uniflow scavenging in various industries, further solidifying its importance in the world of engineering.

单向排气（uniflow scavenging）的概念是两冲程发动机工程中的一个关键方面，这种发动机以其简单性和高功率重量比而闻名。在传统的两冲程发动机中，排气过程是指将废气从气缸中排出并用新鲜空气-燃料混合物替换的方式。然而，这一过程的效率会显著影响发动机的整体性能。这就是uniflow scavenging的作用所在。单向排气的特点是进气口和排气口位于气缸的两侧。这种设计允许新鲜气体直接进入燃烧室，同时有效排出废气。uniflow scavenging的主要优点在于，它最小化了新鲜燃料与废气混合的可能性，这可能导致不完全燃烧和效率降低。与其他排气方法（例如环形排气，其中进气口和排气口位于气缸同一端）相比，uniflow scavenging提供了一种更流线型和高效的方式来清除气缸。这在性能和排放至关重要的应用中尤为重要，例如海洋发动机或高性能摩托车。uniflow scavenging的一个关键好处是它能够维持更高的气缸压力，这可以提高功率输出。通过确保在新鲜气体进入之前有效去除废气，发动机可以在最佳效率下运行。这在赛车场景中特别有利，因为每一点功率都至关重要。此外，uniflow scavenging可以帮助减少逃逸到大气中的未燃烃，从而降低两冲程发动机对环境的影响。实施uniflow scavenging需要精确的工程和设计考虑。制造商必须仔细计算进气口和排气口的尺寸，以及它们开启和关闭的时机。这种精确性确保发动机实现所需的排气效率和性能特征。此外，技术的进步已经使得开发复杂的控制系统成为可能，这些系统可以实时进一步优化排气过程。尽管有其优点，uniflow scavenging也并非没有挑战。设计的复杂性可能增加制造成本，而精确调校的需求可能使维护变得更加困难。然而，特别是在性能至关重要的应用中，这些缺点往往被优势所抵消。总之，uniflow scavenging代表了两冲程发动机设计中的重大进步。它提高了排气效率、增强了功率输出并减少了排放，使其成为现代发动机设计中的一种理想特性。随着技术的不断发展，我们可以期待在各个行业看到uniflow scavenging的更多创新应用，进一步巩固其在工程世界中的重要性。