Low-Frequency Unsteadiness of Pressure-Induced Turbulent Separated Flows

压力引起的湍流分离流的低频不稳定性

• 批准号: RGPIN-2016-03907
• 负责人: Weiss, Julien
• 金额: $ 1.89万
• 依托单位: École de technologie supérieure
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2016
• 资助国家: 加拿大
• 起止时间: 2016-01-01 至 2017-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=614710
• 关键词: Low; Frequency; Unsteadiness; Pressure; Induced

Separation and reattachment of turbulent boundary layers are common in aerodynamic systems and are often detrimental to their performance. The unsteadiness in pressure and velocity that is associated with separating and reattaching flows can lead to vibration, noise, and even unsteady thermal loads in the case of high-speed flows. Yet current engineering prediction methods are still often inadequate to accurately model these phenomena. A better understanding of the physics of separation and reattachment is therefore required in order to improve our capability of modeling and eventually controlling the unsteady aspects of these flows in technological applications. The goal of the proposed research program is to further our understanding of the physical mechanisms that drive the low-frequency, unsteady behavior of pressure-induced turbulent separated flows and to propose physics-based strategies to control this unsteadiness. We plan to combine experimental, numerical, and theoretical approaches to achieve this goal.

湍流边界层的分离和再附着在空气动力系统中是常见的，并且常常对其性能有害。在高速流动的情况下，与分离和再附着流相关的压力和速度的不稳定性会导致振动、噪声甚至不稳定的热载荷。然而，目前的工程预测方法仍然往往不足以准确地模拟这些现象。因此，为了提高我们在技术应用中模拟和最终控制这些流动的非定常方面的能力，需要更好地理解分离和再附着的物理学。 拟议的研究计划的目标是进一步我们的物理机制，驱动压力诱导湍流分离流的低频，非定常行为的理解，并提出基于物理的策略来控制这种不稳定性。我们计划结合联合收割机的实验，数值和理论的方法来实现这一目标。