scavenging efficiency

简明释义

扫气效率

英英释义

例句

1.The team conducted tests to measure the scavenging efficiency of the turbocharger under various conditions.

团队进行了测试，以测量涡轮增压器在不同条件下的清除效率。

2.Researchers are studying the scavenging efficiency of different fuel types in order to optimize combustion.

研究人员正在研究不同燃料类型的清除效率，以优化燃烧过程。

3.Improving the scavenging efficiency is crucial for enhancing the overall fuel economy of the engine.

提高清除效率对增强发动机的整体燃油经济性至关重要。

4.Higher scavenging efficiency can reduce harmful emissions from vehicles.

更高的清除效率可以减少车辆的有害排放。

5.The new engine design significantly improved the scavenging efficiency of the exhaust gases, leading to better performance.

新的发动机设计显著提高了废气的清除效率，从而提升了性能。

作文

In the field of engineering, particularly in internal combustion engines, the term scavenging efficiency refers to the effectiveness with which the engine removes exhaust gases from the combustion chamber and fills it with fresh air or fuel-air mixture. This process is crucial for improving engine performance and reducing emissions. A high scavenging efficiency ensures that the engine operates at its optimal level, maximizing power output while minimizing the amount of unburned fuel that escapes into the environment. The concept of scavenging efficiency can be understood by examining how an engine functions during the intake and exhaust cycles. When the piston moves down during the intake stroke, it creates a vacuum that draws in the air-fuel mixture. Following this, the exhaust valves open, allowing the burnt gases to escape. For an engine to run efficiently, it must effectively clear out these exhaust gases before the next intake occurs. If the scavenging efficiency is low, residual exhaust gases can mix with the incoming fresh charge, leading to incomplete combustion, reduced power, and increased emissions.Several factors influence the scavenging efficiency of an engine. The design of the intake and exhaust systems plays a significant role. For instance, the diameter of the pipes, their length, and the angles at which they connect can all affect how well exhaust gases are expelled and how effectively fresh air enters the cylinder. Additionally, the timing of the valve openings is critical; optimizing this timing can enhance scavenging efficiency significantly.Another important aspect is the use of forced induction systems, such as turbochargers or superchargers. These systems increase the pressure of the incoming air, allowing more air to enter the combustion chamber. Consequently, this leads to a higher scavenging efficiency as the fresh charge can push out the exhaust gases more effectively. However, implementing such systems requires careful calibration to ensure that the engine can handle the increased pressure without causing damage.Furthermore, advancements in technology have led to the development of various techniques aimed at improving scavenging efficiency. For example, variable valve timing (VVT) systems allow for more precise control over the timing of valve openings and closings, which can optimize the scavenging process across different engine speeds. Similarly, the use of advanced computational fluid dynamics (CFD) simulations helps engineers design more efficient intake and exhaust systems, thus enhancing overall scavenging efficiency.In conclusion, scavenging efficiency is a vital parameter that affects the performance and environmental impact of internal combustion engines. Understanding and optimizing this efficiency can lead to significant improvements in power output, fuel economy, and emissions control. As the automotive industry continues to evolve, the focus on enhancing scavenging efficiency will remain crucial in developing cleaner and more powerful engines. Engineers and researchers must continue to innovate and apply new technologies to push the boundaries of what is possible in engine design, ensuring that future vehicles are both efficient and environmentally friendly.

在工程领域，尤其是在内燃机中，术语scavenging efficiency指的是发动机从燃烧室中去除废气并用新鲜空气或燃料-空气混合物填充的有效性。这个过程对于提高发动机性能和减少排放至关重要。高scavenging efficiency确保发动机在最佳水平下运行，最大化功率输出，同时最小化未燃烧燃料逃逸到环境中的数量。通过检查发动机在进气和排气周期中的功能，可以理解scavenging efficiency的概念。当活塞在进气冲程中向下移动时，它会产生一个真空，吸入空气-燃料混合物。随后，排气阀打开，允许燃烧后的气体逸出。为了让发动机高效运行，必须有效地清除这些废气，然后再进行下一次进气。如果scavenging efficiency低，残余的废气可能会与进入的新鲜混合物混合，导致燃烧不完全、功率下降和排放增加。多个因素影响发动机的scavenging efficiency。进气和排气系统的设计起着重要作用。例如，管道的直径、长度以及连接的角度都可以影响废气的排出效果和新鲜空气的进入效率。此外，阀门开启的时机也至关重要；优化这个时机可以显著增强scavenging efficiency。另一个重要方面是使用强制进气系统，例如涡轮增压器或机械增压器。这些系统增加了进入空气的压力，使更多的空气能够进入燃烧室。因此，这导致了更高的scavenging efficiency，因为新鲜混合物可以更有效地将废气推出。然而，实施此类系统需要仔细校准，以确保发动机能够承受增加的压力而不造成损坏。此外，技术的进步导致了多种旨在提高scavenging efficiency的技术的发展。例如，可变气门正时（VVT）系统允许对阀门开启和关闭的时机进行更精确的控制，这可以优化不同发动机转速下的清除过程。同样，使用先进的计算流体动力学（CFD）模拟帮助工程师设计更高效的进气和排气系统，从而增强整体的scavenging efficiency。总之，scavenging efficiency是影响内燃机性能和环境影响的重要参数。理解和优化这一效率可以在功率输出、燃油经济性和排放控制方面带来显著改善。随着汽车工业的不断发展，提高scavenging efficiency的关注将继续在开发更清洁、更强大的发动机中发挥关键作用。工程师和研究人员必须继续创新并应用新技术，以推动发动机设计的可能性界限，确保未来的车辆既高效又环保。