CAREER: Resolving Turbulence-Chemistry Interaction Using Novel Laser Diagnostics

职业：使用新型激光诊断解决湍流化学相互作用

• 批准号: 0844939
• 负责人: Lin Ma
• 金额: $ 40万
• 依托单位: Clemson University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-03-15 至 2011-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0844939&HistoricalAwards=false
• 关键词: CAREER; Resolving; Turbulence; Chemistry; Interaction

0844939MaUnderstanding turbulence is one of the great challenges of physical science; understanding the complicated interactions of turbulence and chemistry is scientifically even more challenging, but it is also ubiquitous in engineering devices and processes. A sound understanding of turbulence-chemistry interaction (TCI) can lead to fundamental improvements in such devices and processes, contributing to the solution of societal issues such as energy security and global warming. Mastering it calls for innovative methods that can resolve the underlying physics to a new level. This project proposes new experimental techniques to address both the science and applications in fundamental and applied systems.The concept is to characterize both the turbulence and the chemistry, especially in two-phase flows, by using photodissociation (PD) to create photofragments that can be measured optically. Precursor molecules are seeded in the gaseous or two-phase flow of interest, then photodissociated by a laser pulse. Because of the nanosecond rapidity of the dissociation, a view of the flow is captured and the TCI can be temporally resolved. Because the dissociation is complete, the resulting photofragment represents the distribution of the seeded precursor. Imaging the concentration of this photofragment can then generate multidimensional measurements of key flow parameters like mixture fraction, scalar dissipation rate, and rates of reaction, which are critical to TCI but generally not measurable with existing experimental methods. This project attempts to develop a unified diagnostic for two-phase flows based on PD, in the sense that the diagnostic characterizes both phases based on the same tracer and sensing technique (even the same lasers and cameras) to elucidate the rich interactions in two-phase flows. Extensive collaborations will be established to share and disseminate the experimental results.Success in this challenging project will have significant impact technologically, but it also has the potential for a significant impact educationally through integration into a range of educational activities. The ultimate aim of this project is to develop these techniques for wide use through collaboration, disseminating data, and teaching its concepts in the classroom and the laboratory. The experimental research will be useful in reforming traditional lecture-based courses, using physical and virtual laboratories to deliver interactive learning opportunities that can also be extended beyond college classrooms.

0844939 Ma 1.理解湍流是物理科学的重大挑战之一;理解湍流和化学的复杂相互作用在科学上更具挑战性，但它在工程设备和过程中也无处不在。对化学反应（TCI）的正确理解可以导致这些设备和过程的根本改进，有助于解决能源安全和全球变暖等社会问题。掌握它需要创新的方法，可以解决潜在的物理到一个新的水平。该项目提出了新的实验技术，以解决基础和应用系统中的科学和应用问题。其概念是通过使用光解离（PD）来产生可以光学测量的光碎片，来表征湍流和化学，特别是在两相流中。前体分子在感兴趣的气体或两相流中接种，然后通过激光脉冲光解离。由于解离的纳秒级速度，可以捕获流的视图，并且可以在时间上分辨TCI。因为解离是完全的，所以所得的光碎片代表了接种前体的分布。成像这种光碎片的浓度，然后可以生成多维测量的关键流参数，如混合物分数，标量耗散率，和反应速率，这是至关重要的TCI，但一般无法测量与现有的实验方法。该项目试图开发一个统一的诊断两相流的基础上PD，在这个意义上，诊断表征两相基于相同的示踪剂和传感技术（甚至相同的激光器和摄像机），以阐明丰富的相互作用，在两相流。将建立广泛的合作来分享和传播实验结果。这个具有挑战性的项目的成功将在技术上产生重大影响，但通过融入一系列教育活动，它也有可能在教育上产生重大影响。该项目的最终目标是通过合作、传播数据以及在课堂和实验室中教授其概念来开发这些技术以供广泛使用。实验研究将有助于改革传统的以讲座为基础的课程，利用物理和虚拟实验室提供互动学习的机会，也可以扩展到大学课堂之外。