Mixing in turbulent flows

在湍流中混合

• 批准号: 217184-2013
• 负责人: Mydlarski, Laurent
• 金额: $ 2.33万
• 依托单位: McGill University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=638920
• 关键词: Mixing; turbulent; flows

In both nature and the man-made world, turbulent flows are the norm (whereas laminar flows are the exception). The research to be undertaken involves the study of mixing within turbulent flows - a phenomenon that underlies a wide range of processes, including aerodynamics, meteorology, combustion, and environmental pollutant dispersion. My main goal is to improve the understanding of turbulent mixing by means of innovative experiments, and related analysis. To this end, my four long-term objectives are: 1) maintaining a solid program of hot-wire anemometry, cold-wire thermometry, and laser-induced fluorescence based experiments, 2) development of new experimental methods and data-analysis techniques, 3) extension of my research program into new areas, and 4) continuing to train students at all levels. To achieve these long-term goals, the present application proposes five complementary research projects that deal with: 1) the mixing of temperature or chemical species in turbulent jets released into turbulent flows, 2) the development of algorithms to locate (biological, chemical, or radioactive) releases in turbulent surroundings, 3) the development of models of the probability density function of temperature or chemical species concentration in turbulent flows, 4) molecular effects in flows involving the mixing of two or more chemical species, and 5) the suppression of mixing that occurs downstream of the confluence of two shallow rivers. The results of the above studies will advance our understanding of turbulent flows by answering important questions that were previously unresolved. The knowledge obtained can then be applied to technological improvements in disciplines related to energy and the environment (e.g. increased combustor efficiencies, revision of improved governmental impact assessment models of environmental pollutant dispersion).

在自然界和人造世界中，湍流都是常态(而层流是例外)。将进行的研究涉及湍流内混合的研究--这一现象是一系列过程的基础，包括空气动力学、气象学、燃烧和环境污染物扩散。我的主要目标是通过创新性的实验和相关分析来提高对湍流混合的理解。为此，我的四个长期目标是：1)保持热线风速、冷线测温和激光诱导荧光实验的坚实计划，2)开发新的实验方法和数据分析技术，3)将我的研究计划扩展到新的领域，以及4)继续培训各级学生。为了实现这些长期目标，本申请提出了五个互补的研究项目，涉及：1)释放到湍流中的湍流射流中温度或化学物质的混合，2)在湍流环境中定位(生物、化学或放射性)释放的算法的发展，3)湍流中温度或化学物质浓度的概率密度函数模型的发展，4)涉及两个或更多化学物质混合的流动中的分子效应，以及5)两条浅水河流汇合处下游发生的混合的抑制。上述研究的结果将通过回答以前未解决的重要问题来促进我们对湍流的理解。所获得的知识可应用于与能源和环境有关的学科的技术改进(例如提高燃烧器效率、修订改进的政府环境污染物扩散影响评估模型)。