lift coefficient

简明释义

升力系数

英英释义

例句

1.A higher lift coefficient 升力系数 allows an aircraft to fly at lower speeds, which is essential for takeoff and landing.

更高的升力系数允许飞机在较低的速度下飞行，这对起飞和着陆至关重要。

2.The lift coefficient 升力系数 is a crucial parameter in determining the performance of an aircraft.

升力系数是决定飞机性能的一个关键参数。

3.In wind tunnel tests, we measure the lift coefficient 升力系数 to evaluate the aerodynamic efficiency of new designs.

在风洞测试中，我们测量升力系数以评估新设计的空气动力学效率。

4.The lift coefficient 升力系数 can be affected by factors such as angle of attack and airspeed.

升力系数可以受到攻角和空速等因素的影响。

5.Engineers often test different wing shapes to optimize the lift coefficient 升力系数 for better fuel efficiency.

工程师们常常测试不同的机翼形状，以优化升力系数以提高燃油效率。

作文

The concept of lift coefficient is crucial in the field of aerodynamics, particularly when analyzing how aircraft and other flying objects generate lift. The lift coefficient is a dimensionless number that relates the lift generated by a wing to the density of the air, the velocity of the airflow, and the surface area of the wing. Understanding this coefficient is essential for engineers and pilots alike, as it directly influences the performance and efficiency of an aircraft.To begin with, the lift coefficient can be defined mathematically as follows: \[ C_L = \frac{L}{0.5 \times \rho \times V^2 \times S} \]Where: - \(C_L\) is the lift coefficient, - \(L\) is the lift force, - \(\rho\) is the air density, - \(V\) is the velocity of the aircraft relative to the air, and - \(S\) is the wing area.This equation illustrates that the lift coefficient is influenced by several factors, including the shape of the wing (airfoil), the angle of attack, and the speed of the aircraft. For instance, as the angle of attack increases, the lift coefficient typically increases until it reaches a maximum point, after which it may decrease due to flow separation and stall conditions.In practical terms, the lift coefficient allows engineers to predict how much lift a wing can generate under specific conditions. This prediction is vital for designing wings that are both efficient and effective in generating lift. For example, during the design phase of a new aircraft, engineers will conduct wind tunnel tests to measure the lift coefficient at various angles of attack and airspeeds. These tests help in refining the wing's design to optimize its aerodynamic properties.Moreover, understanding the lift coefficient is also important for pilots. When flying, pilots must be aware of how changes in speed or angle of attack can affect lift. For instance, if a pilot needs to increase altitude, they must adjust the aircraft's angle of attack to increase the lift coefficient and generate the necessary lift to climb. Conversely, if the angle of attack is too high, the aircraft risks stalling, which can lead to dangerous situations.Furthermore, the lift coefficient plays a significant role in various flight maneuvers. During takeoff and landing, pilots rely on their understanding of the lift coefficient to ensure that the aircraft can safely transition between different phases of flight. For example, during takeoff, a higher lift coefficient is desired to achieve lift-off at lower speeds, while during landing, a controlled descent requires careful management of the lift coefficient to avoid excessive speed or altitude loss.In conclusion, the lift coefficient is a fundamental aspect of aerodynamics that affects both the design and operation of aircraft. Its significance cannot be overstated, as it directly impacts the efficiency, safety, and performance of flying vehicles. By mastering the principles surrounding the lift coefficient, engineers and pilots can work together to enhance aviation technology and improve flight safety for everyone involved. Understanding this concept is not only beneficial for those in the aerospace industry but also enriches our appreciation for the complexities of flight and the science behind it.

在空气动力学领域，升力系数的概念是至关重要的，尤其是在分析飞机和其他飞行物体如何产生升力时。升力系数是一个无量纲数，它将机翼产生的升力与空气的密度、气流的速度和机翼的表面积联系起来。理解这个系数对于工程师和飞行员来说都是必不可少的，因为它直接影响着飞机的性能和效率。首先，升力系数可以通过以下数学公式定义：\[ C_L = \frac{L}{0.5 \times \rho \times V^2 \times S} \]其中：- \(C_L\)是升力系数，- \(L\)是升力，- \(\rho\)是空气密度，- \(V\)是飞机相对于空气的速度，以及- \(S\)是机翼面积。这个方程说明了升力系数受多个因素的影响，包括机翼的形状（气动外形）、攻角和飞机的速度。例如，随着攻角的增加，升力系数通常会增加，直到达到最大值，此后可能由于流动分离和失速条件而降低。在实际应用中，升力系数使工程师能够预测在特定条件下机翼可以产生多少升力。这一预测对设计既高效又有效的升力生成机翼至关重要。例如，在新飞机的设计阶段，工程师会进行风洞测试，以测量在不同攻角和飞行速度下的升力系数。这些测试有助于优化机翼的气动特性。此外，了解升力系数对飞行员也非常重要。在飞行过程中，飞行员必须意识到速度或攻角的变化如何影响升力。例如，如果飞行员需要增加高度，他们必须调整飞机的攻角以增加升力系数，以产生必要的升力进行爬升。相反，如果攻角过高，飞机则有失速的风险，这可能导致危险情况。此外，升力系数在各种飞行动作中也起着重要作用。在起飞和着陆期间，飞行员依赖对升力系数的理解，以确保飞机能够安全地在不同飞行阶段之间过渡。例如，在起飞过程中，期望较高的升力系数以便在较低速度下实现起飞，而在着陆过程中，控制下降需要仔细管理升力系数，以避免过快的速度或高度损失。总之，升力系数是空气动力学的基本方面，影响着飞机的设计和操作。其重要性不容小觑，因为它直接影响飞行器的效率、安全性和性能。通过掌握围绕升力系数的原则，工程师和飞行员可以共同努力提升航空技术，并改善所有相关人员的飞行安全。理解这一概念不仅对航空航天行业的人士有益，也丰富了我们对飞行复杂性及其背后科学的欣赏。