scavenging stroke

简明释义

扫气行程

英英释义

例句

1.The engine's efficiency improved significantly after optimizing the scavenging stroke.

在优化了排气冲程后，发动机的效率显著提高。

2.A longer scavenging stroke can help improve the power output of a two-stroke engine.

更长的排气冲程可以帮助提高二冲程发动机的功率输出。

3.Engine designers often focus on the scavenging stroke to enhance performance.

发动机设计师通常关注排气冲程以增强性能。

4.During the testing phase, we measured the effectiveness of the scavenging stroke in reducing emissions.

在测试阶段，我们测量了排气冲程在减少排放方面的有效性。

5.The scavenging stroke is crucial for ensuring complete combustion in high-performance engines.

在高性能发动机中，排气冲程对于确保完全燃烧至关重要。

作文

In the realm of mechanical engineering, particularly in the study of internal combustion engines, the term scavenging stroke refers to a crucial phase in the engine's operation. During this stroke, the spent gases from the previous combustion cycle are expelled from the cylinder, making way for a fresh charge of air and fuel mixture. This process is essential for maintaining the efficiency and performance of the engine. Without an effective scavenging stroke, the engine would struggle to perform optimally, leading to reduced power output and increased emissions.To understand the importance of the scavenging stroke, one must first grasp how an internal combustion engine operates. The engine works through a series of strokes: intake, compression, power, and exhaust. Each stroke has its own role in the cycle. The scavenging stroke typically occurs after the power stroke when the piston moves down the cylinder. As it descends, the exhaust valves open, allowing the burnt gases to escape. Simultaneously, the incoming air-fuel mixture is drawn into the cylinder, preparing for the next combustion cycle.The efficiency of the scavenging stroke can significantly impact the overall performance of the engine. Engineers often design various scavenging systems to enhance this process. For instance, two-stroke engines utilize a different approach to scavenging compared to four-stroke engines. In two-stroke engines, the design allows for continuous scavenging, which can lead to higher power outputs but may also result in less efficient fuel use and higher emissions. On the other hand, four-stroke engines rely on a more controlled scavenging stroke that can optimize the intake of fresh fuel and air while effectively expelling exhaust gases.Moreover, the timing of the scavenging stroke is critical. If the exhaust valves close too early or too late, it can lead to incomplete scavenging, causing residual gases to mix with the new charge. This not only decreases the engine's efficiency but can also lead to knocking or pre-ignition issues, further complicating engine performance. Therefore, precise engineering and timing mechanisms are vital in modern engine designs to ensure that the scavenging stroke occurs at the optimal moment.In addition to mechanical design, the role of the scavenging stroke extends to environmental considerations. With increasing regulations on emissions, engineers are tasked with improving scavenging techniques to reduce harmful pollutants released into the atmosphere. Innovations such as turbocharging and variable valve timing have emerged as solutions to enhance the scavenging process, ultimately leading to cleaner and more efficient engines.In conclusion, the scavenging stroke is a fundamental aspect of internal combustion engine operation that directly influences performance, efficiency, and emissions. Understanding this concept is essential for anyone studying mechanical engineering or working in automotive design. As technology advances, the methods and strategies employed to optimize the scavenging stroke will continue to evolve, paving the way for more sustainable and powerful engine designs in the future.

在机械工程领域，特别是在内燃机的研究中，“scavenging stroke”这一术语指的是发动机运行中的一个关键阶段。在这个冲程中，前一个燃烧周期产生的废气从气缸中排出，为新的空气和燃料混合物腾出空间。这个过程对于保持发动机的效率和性能至关重要。如果没有有效的scavenging stroke，发动机将难以达到最佳性能，导致功率输出降低和排放增加。为了理解scavenging stroke的重要性，首先必须掌握内燃机的工作原理。发动机通过一系列冲程工作：进气、压缩、动力和排气。每个冲程在循环中都有其自身的作用。通常，scavenging stroke发生在动力冲程之后，当活塞向下移动气缸时。随着活塞下降，排气阀打开，使废气得以逃逸。同时，进入的空气-燃料混合物被吸入气缸，为下一个燃烧周期做好准备。scavenging stroke的效率可以显著影响发动机的整体性能。工程师们常常设计各种清扫系统来增强这个过程。例如，两冲程发动机与四冲程发动机在清扫方面采用不同的方法。在两冲程发动机中，设计允许连续清扫，这可能导致更高的功率输出，但也可能导致燃料使用效率较低和排放增加。另一方面，四冲程发动机依赖于更受控制的scavenging stroke，可以在有效排放废气的同时优化新燃料和空气的摄入。此外，scavenging stroke的时机至关重要。如果排气阀关闭得太早或太晚，可能导致清扫不彻底，造成残留气体与新充气混合。这不仅降低了发动机的效率，还可能导致敲击或预点火问题，进一步复杂化发动机性能。因此，现代发动机设计中精确的工程和时机机制对于确保scavenging stroke在最佳时刻发生至关重要。除了机械设计外，scavenging stroke的作用还扩展到环境考虑。随着对排放的日益严格的法规，工程师们的任务是改善清扫技术，以减少释放到大气中的有害污染物。涡轮增压和可变气门正时等创新已成为优化清扫过程的解决方案，最终导致更清洁、更高效的发动机。总之，scavenging stroke是内燃机运行的一个基本方面，直接影响性能、效率和排放。理解这一概念对于任何学习机械工程或从事汽车设计的人来说都是至关重要的。随着技术的进步，用于优化scavenging stroke的方法和策略将继续演变，为未来更可持续和更强大的发动机设计铺平道路。