separation of boundary layer

简明释义

边界层分离

英英释义

例句

1.The design modifications aimed to reduce the separation of boundary layer around the wings.

设计修改旨在减少翼周围的边界层分离。

2.The separation of boundary layer can lead to increased drag on the vehicle.

边界层分离可能导致车辆阻力增加。

3.Engineers studied the effects of separation of boundary layer on the aircraft's performance.

工程师研究了边界层分离对飞机性能的影响。

4.In wind tunnel tests, we observed separation of boundary layer at high angles of attack.

在风洞测试中，我们观察到在高攻角下发生了边界层分离。

5.The pilot noticed a sudden change in lift due to the separation of boundary layer.

飞行员注意到由于边界层分离，升力发生了突然变化。

作文

In fluid dynamics, the concept of separation of boundary layer plays a crucial role in understanding how fluids behave as they flow over surfaces. The boundary layer is a thin region adjacent to the surface of an object where the effects of viscosity are significant. Within this layer, the velocity of the fluid changes from zero at the surface (due to the no-slip condition) to nearly the free stream velocity just outside the layer. However, under certain conditions, this smooth flow can become disrupted, leading to a phenomenon known as separation of boundary layer (边界层分离). This separation occurs when the flow cannot remain attached to the surface, often due to adverse pressure gradients or changes in the flow direction.The implications of separation of boundary layer are vast and can significantly affect the performance of various engineering systems, particularly in aerospace and automotive applications. For instance, when air flows over an airplane wing, maintaining a streamlined flow is essential for generating lift. If the boundary layer separates too early, it can lead to increased drag and decreased lift, ultimately affecting the aircraft's performance. Understanding the conditions that lead to separation of boundary layer is therefore critical for engineers who design aerodynamic surfaces.Moreover, separation of boundary layer can also impact the heat transfer characteristics of surfaces. In heat exchangers, for example, a well-attached boundary layer can enhance heat transfer efficiency. Conversely, if separation occurs, it can create stagnant regions where heat transfer is significantly reduced. This knowledge is vital for optimizing thermal systems and ensuring they operate efficiently.To mitigate the effects of separation of boundary layer, engineers employ various strategies, such as modifying the shape of objects to maintain attached flow or using devices like vortex generators to energize the boundary layer. These techniques help delay separation and improve overall performance. Additionally, computational fluid dynamics (CFD) simulations are increasingly used to predict the behavior of boundary layers and assess the potential for separation in different scenarios.In conclusion, the separation of boundary layer is a fundamental concept in fluid dynamics that has significant implications for engineering and technology. By understanding and controlling this phenomenon, engineers can design more efficient systems across a variety of applications, from aircraft to heat exchangers. As research continues to advance in this field, it is likely that new methods and technologies will emerge to further enhance our ability to manage boundary layer behavior effectively.

在流体动力学中，边界层分离的概念在理解流体如何在表面上流动方面起着至关重要的作用。边界层是紧邻物体表面的一个薄区域，在这个区域内，粘度的影响显著。在这一层内，流体的速度从表面（由于无滑移条件）处的零速度变化到层外几乎是自由流速。然而，在某些条件下，这种平稳的流动可能会受到干扰，导致称为边界层分离的现象。当流动无法保持附着在表面上时，通常是由于不利的压力梯度或流动方向的变化，这种分离就会发生。边界层分离的影响是广泛的，并且可能显著影响各种工程系统的性能，特别是在航空航天和汽车应用中。例如，当空气流过飞机机翼时，保持流线型流动对产生升力至关重要。如果边界层过早分离，可能会导致阻力增加和升力下降，最终影响飞机的性能。因此，了解导致边界层分离的条件对于设计气动表面的工程师至关重要。此外，边界层分离还可以影响表面的传热特性。例如，在热交换器中，良好的附着边界层可以提高热传递效率。相反，如果发生分离，可能会形成滞留区域，热传递显著降低。这一知识对于优化热系统并确保其高效运行至关重要。为了减轻边界层分离的影响，工程师采用各种策略，例如修改物体的形状以保持附着流动，或使用涡流发生器等装置来增强边界层。这些技术有助于延迟分离并改善整体性能。此外，计算流体动力学（CFD）模拟越来越多地用于预测边界层的行为，并评估不同场景中分离的潜在性。总之，边界层分离是流体动力学中的一个基本概念，对工程和技术具有重要意义。通过理解和控制这一现象，工程师可以在各种应用中设计出更高效的系统，从飞机到热交换器。随着这一领域研究的不断进展，预计将出现新的方法和技术，以进一步增强我们有效管理边界层行为的能力。