scavenging pressure

简明释义

扫气压力

英英释义

例句

1.The relationship between scavenging pressure and exhaust temperature is critical in engine tuning.

在发动机调校中，排气压力与排气温度之间的关系至关重要。

2.Engine designers often focus on maximizing scavenging pressure to enhance power output.

发动机设计师通常专注于最大化排气压力以增强功率输出。

3.Improper scavenging pressure can lead to increased emissions in diesel engines.

不当的排气压力可能导致柴油发动机排放增加。

4.A higher scavenging pressure leads to better fuel efficiency in combustion engines.

更高的排气压力会导致燃烧发动机的燃油效率更高。

5.The engine's performance can be significantly improved by optimizing the scavenging pressure.

通过优化排气压力，可以显著提高发动机的性能。

作文

In the field of internal combustion engines, one of the critical factors that influence performance is the concept of scavenging pressure. This term refers to the pressure difference created during the intake and exhaust processes, which facilitates the removal of exhaust gases from the combustion chamber and allows fresh air-fuel mixture to enter. Understanding scavenging pressure is essential for engineers and designers who aim to optimize engine efficiency and power output.The process of scavenging is vital in two-stroke engines, where the timing of exhaust and intake valves is crucial. In a typical two-stroke cycle, as the piston moves down, it creates a low-pressure area that helps draw in the fresh charge while simultaneously pushing out the exhaust gases. The effectiveness of this process depends significantly on the scavenging pressure. If the pressure is too low, not all of the exhaust gases will be expelled, leading to incomplete combustion and reduced engine performance.Conversely, if the scavenging pressure is too high, it can cause a phenomenon known as 'blow-down', where fresh fuel-air mixture escapes out of the exhaust port before it can be utilized for combustion. This not only wastes fuel but also contributes to increased emissions, which is a growing concern in today's environmentally conscious world.To achieve optimal scavenging pressure, various design elements must be considered. The shape and size of the combustion chamber, the length and diameter of the intake and exhaust ports, and the timing of valve openings all play a significant role. For instance, engineers might design longer intake runners to increase the velocity of the incoming air-fuel mixture, thereby enhancing the scavenging pressure and improving the overall efficiency of the engine.Additionally, advancements in technology have led to the development of sophisticated systems that can actively control scavenging pressure. Variable valve timing (VVT) systems, for example, allow for adjustments in valve timing based on engine speed and load conditions. This adaptability ensures that the engine operates efficiently across a wide range of conditions, maximizing power output while minimizing fuel consumption.Moreover, the importance of scavenging pressure extends beyond just performance metrics; it also has implications for engine longevity and maintenance. Engines that experience poor scavenging may suffer from carbon buildup, leading to increased wear and tear on components. Regular monitoring and optimization of scavenging pressure can help mitigate these issues, ensuring that the engine remains in good working condition for a longer period.In conclusion, scavenging pressure is a fundamental concept in the design and operation of internal combustion engines. Its impact on performance, efficiency, and emissions cannot be overstated. As the automotive industry continues to evolve, understanding and optimizing scavenging pressure will remain a priority for engineers striving to create cleaner, more efficient engines. By focusing on this critical aspect, we can pave the way for advancements in engine technology that meet the demands of modern society while also protecting our environment.

在内燃机领域，影响性能的一个关键因素是“scavenging pressure”这一概念。这个术语指的是在进气和排气过程中产生的压力差，它有助于将废气从燃烧室中排出并允许新鲜的空气-燃料混合物进入。理解scavenging pressure对于希望优化发动机效率和功率输出的工程师和设计师来说至关重要。清扫过程在两冲程发动机中至关重要，在这种发动机中，排气阀和进气阀的时机非常关键。在典型的两冲程循环中，活塞向下移动时，会产生一个低压区域，这有助于吸入新鲜的混合气，同时将废气推出。如果scavenging pressure过低，不能完全排出所有的废气，导致燃烧不完全，从而降低发动机性能。相反，如果scavenging pressure过高，则可能导致一种现象称为“吹出”，即新鲜的燃料-空气混合物在可以用于燃烧之前就逃逸出排气口。这不仅浪费燃料，还会增加排放，这是当今环保意识日益增强的世界中的一个重要问题。为了实现最佳的scavenging pressure，必须考虑各种设计元素。燃烧室的形状和大小、进气和排气口的长度和直径以及阀门开启的时机都起着重要作用。例如，工程师可能设计较长的进气管道，以提高进入空气-燃料混合物的速度，从而增强scavenging pressure，提高发动机的整体效率。此外，技术的进步导致了开发出可以主动控制scavenging pressure的复杂系统。例如，可变气门正时（VVT）系统允许根据发动机转速和负载条件调整阀门时机。这种适应性确保发动机在广泛的条件下高效运行，最大限度地提高功率输出，同时最小化燃料消耗。此外，scavenging pressure的重要性不仅限于性能指标；它还对发动机的寿命和维护有影响。经历不良清扫的发动机可能会出现碳沉积，导致部件磨损加剧。定期监测和优化scavenging pressure可以帮助减轻这些问题，确保发动机在更长时间内保持良好的工作状态。总之，scavenging pressure是内燃机设计和运行中的一个基本概念。它对性能、效率和排放的影响不容小觑。随着汽车工业的不断发展，理解和优化scavenging pressure将继续成为工程师创造更清洁、更高效发动机的优先事项。通过关注这一关键方面，我们可以为满足现代社会需求同时保护环境的发动机技术进步铺平道路。