volumetric efficiency

简明释义

容积效率

英英释义

例句

1.Engine designers often strive for a volumetric efficiency 容积效率 above 85% for optimal performance.

发动机设计师通常力求达到超过85%的容积效率 volumetric efficiency 以实现最佳性能。

2.A turbocharger is designed to enhance the volumetric efficiency 容积效率 of an engine by forcing more air into the combustion chamber.

涡轮增压器旨在通过将更多空气强制送入燃烧室来提高发动机的容积效率 volumetric efficiency。

3.The volumetric efficiency 容积效率 of a naturally aspirated engine is typically lower than that of a turbocharged engine.

自然吸气发动机的容积效率 volumetric efficiency 通常低于涡轮增压发动机。

4.The engine's volumetric efficiency 容积效率 plays a crucial role in determining its overall performance.

发动机的容积效率 volumetric efficiency 在决定其整体性能中起着至关重要的作用。

5.Improving the volumetric efficiency 容积效率 can lead to better fuel economy in vehicles.

提高容积效率 volumetric efficiency 可以改善车辆的燃油经济性。

作文

Volumetric efficiency is a term commonly used in the field of mechanical engineering and automotive design. It refers to the effectiveness with which an engine can fill its cylinders with air or air-fuel mixture during the intake stroke. In simpler terms, it measures how well an engine breathes. Higher volumetric efficiency means that the engine is able to take in more air, which can lead to increased power output and overall performance. Understanding volumetric efficiency is crucial for engineers and designers who aim to optimize engine performance and fuel efficiency.To grasp the concept of volumetric efficiency, one must first understand the basic operation of an internal combustion engine. During the intake stroke, the engine's pistons move down, creating a vacuum that draws in air through the intake valves. Ideally, the engine should fill its cylinders completely with fresh air or air-fuel mixture. However, in reality, several factors can affect this process, leading to less than optimal filling of the cylinders.One of the primary factors influencing volumetric efficiency is the design of the intake system. The shape, size, and length of the intake manifold, along with the configuration of the intake valves, can significantly impact how efficiently air enters the cylinders. For instance, a well-designed intake manifold can create a smooth airflow, reducing turbulence and allowing for a more effective filling of the cylinders. Conversely, a poorly designed intake system can restrict airflow, resulting in lower volumetric efficiency.Another critical aspect is the engine's RPM (revolutions per minute). At low RPMs, the engine may not be able to draw in enough air to fill the cylinders completely, leading to decreased volumetric efficiency. As the engine speed increases, the airflow improves, and the volumetric efficiency typically rises. However, there is a point where the efficiency may start to decline again due to the limitations of the engine's design and the onset of phenomena such as reversion, where the air-fuel mixture begins to flow back into the intake manifold instead of filling the cylinder.The temperature and density of the incoming air also play a vital role in determining volumetric efficiency. Cooler, denser air contains more oxygen molecules, which can enhance combustion and power output. This is why many high-performance engines utilize intercoolers to lower the temperature of the intake air, thereby improving volumetric efficiency and overall performance.In addition to these factors, modern engines often incorporate technologies such as variable valve timing and forced induction (like turbocharging) to improve volumetric efficiency. Variable valve timing allows for optimal timing of the intake valves, enhancing airflow across different RPM ranges. Turbochargers compress the incoming air, increasing its density and enabling the engine to take in more air than it normally would at atmospheric pressure.In conclusion, volumetric efficiency is a critical parameter in engine design and performance. It directly influences the amount of air that can enter the engine's cylinders, affecting power output and fuel efficiency. By optimizing factors such as intake design, engine speed, air temperature, and utilizing advanced technologies, engineers can significantly enhance an engine's volumetric efficiency, leading to better performance and reduced emissions. Understanding this concept is essential for anyone involved in automotive engineering or performance tuning, as it lays the groundwork for innovations that drive the industry forward.

容积效率是一个常用于机械工程和汽车设计领域的术语。它指的是发动机在进气冲程中填充气缸的空气或空气-燃料混合物的有效性。简单来说，它衡量了发动机的呼吸能力。更高的容积效率意味着发动机能够吸入更多的空气，从而可能导致输出功率和整体性能的增加。理解容积效率对于希望优化发动机性能和燃油效率的工程师和设计师至关重要。要掌握容积效率的概念，首先必须了解内燃机的基本操作。在进气冲程中，发动机的活塞向下移动，产生真空，从而通过进气阀吸入空气。理想情况下，发动机应该完全填充其气缸以获得新鲜空气或空气-燃料混合物。然而，实际上，有几个因素会影响这个过程，导致气缸的填充效果不尽如人意。影响容积效率的主要因素之一是进气系统的设计。进气歧管的形状、大小和长度，以及进气阀的配置，会显著影响空气进入气缸的效率。例如，设计良好的进气歧管可以创造平稳的气流，减少湍流，从而允许气缸更有效地填充。相反，设计不良的进气系统可能会限制气流，导致较低的容积效率。另一个关键方面是发动机的转速（每分钟转数）。在低转速下，发动机可能无法吸入足够的空气来完全填充气缸，从而导致容积效率降低。随着发动机转速的增加，气流改善，通常会提高容积效率。然而，存在一个点，在此之后，由于发动机设计的局限性以及如回流等现象的出现，效率可能会再次下降，回流是指空气-燃料混合物开始流回进气歧管，而不是填充气缸。进入空气的温度和密度也在确定容积效率方面发挥着重要作用。较冷、较密的空气含有更多的氧分子，可以增强燃烧和功率输出。这就是为什么许多高性能发动机采用中冷器来降低进气空气的温度，从而改善容积效率和整体性能。除了这些因素，现代发动机通常还采用可变气门正时和强制进气（如涡轮增压）等技术来提高容积效率。可变气门正时允许在不同转速范围内优化进气阀的时机，从而增强气流。涡轮增压器压缩进入的空气，提高其密度，使发动机能够吸入比正常大气压力下更多的空气。总之，容积效率是发动机设计和性能中的一个关键参数。它直接影响空气进入发动机气缸的数量，从而影响功率输出和燃油效率。通过优化进气设计、发动机转速、空气温度，并利用先进技术，工程师可以显著提高发动机的容积效率，从而提高性能并减少排放。理解这一概念对于任何参与汽车工程或性能调校的人来说都是必不可少的，因为它为推动行业前进的创新奠定了基础。