lifting line

简明释义

升力线

英英释义

例句

1.Safety protocols require that the lifting line be tested before each use.

安全协议要求在每次使用前测试吊线。

2.During the construction, the lifting line played a crucial role in moving materials.

在施工过程中，吊线在移动材料方面起到了关键作用。

3.The engineer adjusted the lifting line to ensure the load was balanced.

工程师调整了吊线以确保负载平衡。

4.The crane's lifting line was too short to reach the upper floors.

起重机的吊线太短，无法到达上层。

5.He inspected the lifting line for any signs of wear before the operation.

在操作之前，他检查了吊线是否有磨损迹象。

作文

The concept of the lifting line is essential in the field of aerodynamics, particularly when analyzing the lift generated by wings. In simple terms, a lifting line refers to an imaginary line along the length of a wing or airfoil, where the lift force can be considered to act. This concept helps engineers and scientists understand how different shapes and angles of wings affect the overall performance of an aircraft. To delve deeper, let’s consider how the lifting line theory works. When air flows over a wing, it creates a difference in pressure between the upper and lower surfaces. The airfoil's shape and the angle of attack— the angle between the chord line of the wing and the oncoming air— play crucial roles in determining this pressure difference. The lifting line model simplifies the complex flow around a wing into a more manageable form, allowing for easier calculations of lift. One of the most significant applications of the lifting line theory is in the design of aircraft wings. Engineers use this theory to predict how changes in wing design will affect lift and drag. For instance, if a wing is designed with a higher aspect ratio, the lifting line theory suggests that it will generate more lift at a given speed compared to a wing with a lower aspect ratio. This knowledge is vital for creating efficient and effective aircraft. Moreover, the lifting line concept is not limited to fixed-wing aircraft. It also applies to rotary-wing vehicles, such as helicopters, where the rotor blades can be treated similarly to wings. By understanding how the lifting line interacts with the airflow, engineers can optimize rotor designs for better performance and efficiency. In addition to its practical applications, the lifting line theory also provides insights into the fundamental principles of flight. It illustrates how lift is generated and how various factors influence this process. For students and professionals in aerospace engineering, grasping the concept of the lifting line is crucial for advancing their understanding of flight mechanics. In conclusion, the lifting line is a foundational element in the study of aerodynamics and plays a pivotal role in the design and analysis of both fixed and rotary-wing aircraft. By simplifying the complexities of airflow around wings, it allows for more straightforward calculations and predictions of lift. Whether in classrooms or research labs, the lifting line continues to be a vital topic for anyone interested in the science of flight.

‘lifting line’的概念在空气动力学领域中至关重要，特别是在分析机翼产生的升力时。简单来说，‘lifting line’指的是沿着机翼或气动外形长度的想象线，在此线的位置可以认为升力作用于此。这个概念帮助工程师和科学家理解不同形状和角度的机翼如何影响飞机的整体性能。深入探讨一下，‘lifting line’理论是如何运作的。当空气流过机翼时，它会在上下表面之间产生压力差。气动外形的形状和攻角——即机翼弦线与迎面气流之间的角度——在决定这种压力差方面起着关键作用。‘lifting line’模型将围绕机翼的复杂流动简化为更易管理的形式，从而便于升力的计算。‘lifting line’理论最重要的应用之一是在飞机机翼的设计中。工程师利用这一理论来预测机翼设计变化对升力和阻力的影响。例如，如果机翼设计为具有更高的展弦比，则‘lifting line’理论表明，在给定速度下，它将比具有较低展弦比的机翼产生更多的升力。这一知识对于创造高效且有效的飞机至关重要。此外，‘lifting line’概念并不限于固定翼飞机。它同样适用于旋翼飞行器，如直升机，在这些情况下，转子叶片可以类似于机翼来处理。通过理解‘lifting line’如何与气流相互作用，工程师能够优化转子设计，以获得更好的性能和效率。除了其实际应用外，‘lifting line’理论还提供了对飞行基本原理的洞察。它说明了升力是如何产生的，以及各种因素如何影响这一过程。对于航空航天工程的学生和专业人员来说，掌握‘lifting line’的概念对于深化他们对飞行力学的理解至关重要。总之，‘lifting line’是空气动力学研究中的基础要素，在固定翼和旋翼飞机的设计与分析中发挥着关键作用。通过简化围绕机翼的气流复杂性，它允许更简单的升力计算和预测。无论是在课堂上还是研究实验室，‘lifting line’仍然是任何对飞行科学感兴趣的人必须了解的重要主题。