Passive and Active Flow-Control in the Turbulent Three-Dimensional Wall Jet

湍流三维壁射流中的被动和主动流动控制

• 批准号: 355889-2013
• 负责人: Hall, Joseph
• 金额: $ 1.68万
• 依托单位: University of New Brunswick
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2014
• 资助国家: 加拿大
• 起止时间: 2014-01-01 至 2015-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=549858
• 关键词: Passive; Active; Flow; Control; Turbulent

It is generally accepted that organized turbulent motions persist beneath seemingly random turbulent flows. These organized motions, or coherent structures are linked to many properties of engineering interest, like drag, heat-transfer or noise production. The present research program is aimed at improving our understanding of how to control these coherent structures by both passive and active means to produce useful engineering results like drag-reduction, enhanced heat-transfer, and reduced noise emissions. Flow-control techniques like these have the potential to save billions of dollars in annual fuel savings and produce more economical and environmentally friendly industrial processes. The objective of the proposed research is to experimentally control the coherent structures in a three-dimensional wall jet by both active and passive means to reduce and enhance the lateral development of the flow. Both outcomes are useful in many practical applications. In particular, enhancing surface coverage of the jet is advantageous where large areas heat-transfer are required, whereas, reducing the lateral development of the jet will likely enhance mixing and be useful in combustion applications. Using our existing knowledge of the organized turbulent motions in the jet, the first phase of the research will employ passive control techniques (like vortex generators) to control the lateral development of the jet. The second phase of the research is aimed at working towards advanced reactive flow control capabilities and will improve our flow sensing capabilities using multi-point wall pressure measurements.

人们普遍认为，在看似随机的湍流之下，有组织的湍流运动持续存在。这些有组织的运动或相干结构与许多具有工程意义的性质有关，如阻力、热传递或噪音产生。目前的研究计划旨在提高我们对如何通过被动和主动手段控制这些相干结构的理解，以产生有用的工程结果，如减阻、强化传热和降低噪声排放。这样的流量控制技术有可能每年节省数十亿美元的燃料，并产生更经济、更环保的工业流程。该研究的目的是通过实验控制三维壁面射流中的拟序结构，包括主动和被动两种方法，以减少和增强流动的横向发展。这两个结果在许多实际应用中都是有用的。特别是，在需要大面积换热的情况下，增加射流的表面覆盖率是有利的，而减少射流的横向发展可能会增强混合，并在燃烧应用中有用。利用我们已有的关于射流中有组织的湍流运动的知识，第一阶段的研究将采用被动控制技术(如涡流发生器)来控制射流的横向发展。研究的第二阶段旨在开发先进的反应性流量控制能力，并将使用多点壁压测量来提高我们的流量传感能力。