brake thermal efficiency

简明释义

制动热效率

英英释义

例句

1.A vehicle with a high brake thermal efficiency 制动热效率 will generally have better fuel economy.

一辆具有高brake thermal efficiency 制动热效率的汽车通常会有更好的燃油经济性。

2.Engine designers focus on increasing brake thermal efficiency 制动热效率 to reduce emissions.

发动机设计师专注于提高brake thermal efficiency 制动热效率以减少排放。

3.Higher brake thermal efficiency 制动热效率 means that more fuel energy is converted into useful work.

更高的brake thermal efficiency 制动热效率意味着更多的燃料能量被转化为有用的工作。

4.The engine's brake thermal efficiency 制动热效率 improved significantly after the recent modifications.

经过最近的改进，发动机的brake thermal efficiency 制动热效率显著提高。

5.The brake thermal efficiency 制动热效率 of this new model exceeds that of its predecessor.

这个新型号的brake thermal efficiency 制动热效率超过了其前身。

作文

In the world of engineering and thermodynamics, one of the critical parameters that engineers focus on is the concept of brake thermal efficiency. This term refers to the efficiency of an engine in converting the heat from fuel into work. Specifically, it is defined as the ratio of the power output of the engine (the brake power) to the heat input from the fuel consumed. Understanding brake thermal efficiency is essential for improving engine performance and reducing fuel consumption, which is increasingly important in today’s environmentally conscious society.To grasp the significance of brake thermal efficiency, we must first consider how internal combustion engines operate. These engines burn fuel to create heat, which then expands gases that push against the engine's pistons. The energy generated during this process is what ultimately powers the vehicle. However, not all the energy from the fuel is converted into usable mechanical energy; a significant portion is lost as waste heat. This is where brake thermal efficiency comes into play, as it provides a measure of how effectively an engine converts fuel into useful work.The formula for calculating brake thermal efficiency is quite simple: it is the brake power divided by the heat input, usually expressed as a percentage. For example, if an engine produces 100 horsepower (approximately 75 kW) while consuming 300 kW of thermal energy from the fuel, its brake thermal efficiency would be calculated as follows:Brake Thermal Efficiency = (Brake Power / Heat Input) × 100% In this case, it would be (75 kW / 300 kW) × 100% = 25%. This means that only 25% of the energy from the fuel is being converted into useful work, while the remaining 75% is lost as waste heat.Improving brake thermal efficiency is a significant focus for automotive engineers and manufacturers. Higher efficiency means better fuel economy, which directly translates to cost savings for consumers and reduced emissions for the environment. Various strategies can be employed to enhance this efficiency, such as optimizing the combustion process, improving air-fuel mixing, and utilizing advanced materials that can withstand higher temperatures.Moreover, advancements in technology have led to the development of hybrid and electric vehicles, which offer alternative approaches to achieving high brake thermal efficiency. While traditional internal combustion engines have limitations due to thermal losses, electric motors can convert electrical energy into mechanical energy with much higher efficiency, often exceeding 90%. This shift towards electric propulsion highlights the importance of focusing on brake thermal efficiency as we move towards more sustainable transportation solutions.In conclusion, brake thermal efficiency is a fundamental concept in understanding engine performance and efficiency. It serves as a benchmark for evaluating how well an engine converts fuel into work, and improving this metric is crucial for both economic and environmental reasons. As technology continues to evolve, the pursuit of higher brake thermal efficiency will remain at the forefront of engineering challenges, driving innovations that lead to cleaner and more efficient vehicles for the future.

在工程和热力学的世界中，工程师关注的关键参数之一是“制动热效率”（brake thermal efficiency）的概念。这个术语指的是发动机将燃料中的热量转化为功的效率。具体而言，它被定义为发动机的功率输出（制动功率）与消耗燃料的热输入的比率。理解brake thermal efficiency对于提高发动机性能和减少燃料消耗至关重要，这在当今环保意识日益增强的社会中变得尤为重要。为了掌握brake thermal efficiency的重要性，我们首先必须考虑内燃机的工作原理。这些发动机燃烧燃料以产生热量，然后使气体膨胀，推动发动机的活塞。在这个过程中产生的能量最终驱动车辆。然而，并不是所有来自燃料的能量都转化为可用的机械能；相当一部分作为废热损失。这就是brake thermal efficiency发挥作用的地方，因为它提供了一个衡量发动机将燃料转化为有用功的有效性的标准。计算brake thermal efficiency的公式相当简单：它是制动功率除以热输入，通常以百分比表示。例如，如果一台发动机产生100马力（约75千瓦），同时消耗300千瓦的热能，其brake thermal efficiency可以如下计算：制动热效率 = (制动功率 / 热输入) × 100%在这种情况下，它将是(75千瓦 / 300千瓦) × 100% = 25%。这意味着只有25%的燃料能量被转化为有用功，而其余的75%作为废热损失。提高brake thermal efficiency是汽车工程师和制造商的重要关注点。更高的效率意味着更好的燃油经济性，这直接转化为消费者的成本节约和对环境的减排。可以采用各种策略来提高这一效率，例如优化燃烧过程、改善空气-燃料混合以及利用能够承受更高温度的先进材料。此外，技术的进步导致混合动力和电动车辆的发展，这提供了实现高brake thermal efficiency的替代方法。虽然传统的内燃机由于热损失而存在局限性，但电动机可以将电能转化为机械能，效率往往超过90%。这种向电动推进的转变突显了在我们朝着更可持续的交通解决方案迈进时，关注brake thermal efficiency的重要性。总之，brake thermal efficiency是理解发动机性能和效率的基本概念。它作为评估发动机将燃料转化为功的有效性的基准，而提高这一指标对于经济和环境原因都是至关重要的。随着技术的不断发展，追求更高的brake thermal efficiency将继续成为工程挑战的前沿，推动创新，带来未来更清洁、更高效的车辆。