Investigation of Turbulent Flow Separation and the Development of Flow Control Strategies for Bluff Bodies in Ground Proximity

近地钝体湍流分离的研究和流动控制策略的开发

• 批准号: RGPIN-2018-05369
• 负责人: AgelinChaab, Martin
• 金额: $ 2.33万
• 依托单位: University of Ontario Institute of Technology
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=713645
• 关键词: Investigation; Turbulent; Flow; Separation; Development

Flow separation and aerodynamics of bluff bodies (objects with boxy shapes like bricks or some road vehicles) are encountered in many industrial applications. The consequences of flow separation include significant pressure fluctuations that cause undesirable effects such as drag, structural vibration, noise and significant reductions in efficiency and performance of engineering systems. It is well-known that at highway speeds, for example, more than 50% of the fuel is used to overcome aerodynamic drag on road vehicles. For the above reasons, bluff body aerodynamics has been a subject of intensive research interests for many decades. However, for complex three-dimensional (3D) bluff bodies, some fundamental questions are not fully resolved: how do we accurately predict the drag on a 3D bluff body? The proposed research has three short-term objectives: i) characterize in detail the mean and fluctuating flow structures of a number of 3D bluff bodies in ground proximity; ii) develop advanced flow control strategies that are effective for 3D bluff bodies, and mechanistic parameters for quantifying them; and iii) develop accurate numerical models for fully capturing the complete aerodynamic phenomena on the bluff bodies. In order to meet the short-term objectives, a variety of 3D bluff bodies will be constructed. Velocity, pressure, and force measurements will then be conducted around the bluff bodies in wind and water tunnels using particle image velocimetry, hotwire, pressure sensors, and force sensors. In addition, numerical techniques will be employed for these studies using open source numerical codes. It is expected that over the next 5 years, 16 HQP (3 PhD, 3 MASc, and 10 undergraduate students) will be trained to perform detailed experiments and numerical simulations to enable them to gain a thorough physical understanding of bluff body aerodynamics. It is anticipated that a successful completion of the research program will provide new insight to illuminate our physical understanding of age-old fundamental questions. This can lead to the development of cost-effective flow control devices to improve the efficiency of engineering systems. It will also help reduce Canada's carbon footprint and its impacts on our climate. Additionally, HQP will develop useful skills for employment in academia or diverse industries of socio-economic importance to Canada.

在许多工业应用中，遇到了悬崖主体的流动分离和空气动力学（带有砖砌或某些公路车辆的物体）。流动分离的后果包括显着的压力波动，从而引起不良影响，例如阻力，结构振动，噪声和工程系统效率和性能的显着降低。众所周知，在高速公路速度下，超过50％的燃料用于克服公路车辆的空气动力学阻力。出于上述原因，虚张声势的空气动力学数十年来一直是强化研究兴趣的主题。但是，对于复杂的三维（3D）虚张声势，一些基本问题没有完全解决：我们如何准确预测3D悬崖体上的阻力？ 拟议的研究具有三个短期目标：i）详细描述地面接近的许多3D虚张声势体的平均流动结构； ii）制定有效的3D虚张声势的高级流控制策略，以及量化它们的机械参数； iii）开发准确的数值模型，以完全捕获虚张声势的完全空气动力学现象。为了实现短期目标，将建立各种3D虚张声势。然后，将使用粒子图像速度计，热线，压力传感器和力传感器在风和水隧道中的悬崖体周围进行速度，压力和力测量。此外，使用开源数值代码将采用这些研究的数值技术。 预计将在未来5年内进行16个HQP（3位PHD，3个MASC和10名本科生）进行培训，以执行详细的实验和数值模拟，以使他们能够对虚张声势的身体空气动力学获得彻底的物理理解。预计研究计划的成功完成将提供新的见解，以阐明我们对古老的基本问题的物理理解。这可以导致开发具有成本效益的流量控制设备，以提高工程系统的效率。这还将有助于减少加拿大的碳足迹及其对我们气候的影响。此外，HQP将在学术界或对加拿大具有社会经济重要性的多元化行业发展有用的技能。