UNS: Simultaneous 4D Flamelet and Velocity Diagnostics for Resolving Flamelet/Flow Interactions

湍流燃烧是一种具有重要科学意义和实际意义的基础过程。湍流火焰本身在空间上是三维的，在时间上是动态的。到目前为止，测量湍流火焰的实验技术仅限于测量一个点、一条线或一个平面，而且它们不能完全解决火焰的三维结构。该项目将进行四维测量，以精确的分辨率在所有三个空间方向和时间上解决火焰，这将提高我们对湍流燃烧的理解。湍流燃烧是许多控制能源生产装置的关键过程。提高我们对湍流燃烧的理解将有助于设计出更高效、更清洁的能源装置。该项目还将利用互联网资源为更多的受众开发学习平台，向更广泛的社区传播成果，并提高公众对能源、环境和信息技术问题的认识。该项目的目标是获得湍流燃烧过程关键的多种特性的瞬时和同时4D测量。该项目将应用PI最近开发的3D层析成像诊断来解决湍流火焰中的小火焰/流动相互作用。目标特性包括三维火焰表面密度、火焰体积、火焰曲率、分形维数、3D3C（三维、三分量）速度场，以及潜在的局部应变率和湍流火焰速度。该项目的成功将使具有代表性的湍流火焰的4D特性测量成为可能，并建立多维数据集，可用于开发设计新能源设备的计算工具。此外，该项目结合了几个不同的学科，包括光学成像、计算机断层扫描、燃烧以及大型数据集的处理和分析。该项目的成果将使能源、光子学和信息技术领域的从业人员受益。

CBET - 1505112PI: Ma, LinTurbulent combustion is a fundamental process of significant scientific and practical importance. Turbulent flames are inherently three-dimensional in space and dynamic in time. Until now, experimental techniques to measure turbulent flames have been limited to measurements at a point, along a line, or across a plane, and they do not fully resolve the three-dimensional structure of the flame. This project will conduct four-dimensional measurements that resolve the flame in all three spatial directions and time with precise resolution, which will improve our understanding of turbulent combustion. Turbulent combustion is the key process in many devices that dominate energy production. Improving our understanding of turbulent combustion will lead to the design of more efficient and cleaner energy devices. The project will also employ internet resources to develop learning platforms for a larger audience, to disseminate results to a wider community, and to increase public awareness of energy, environmental, and information technology issues. This goal of this project is to obtain instantaneous and simultaneous 4D measurements of multiple properties key to the turbulent combustion processes. The project will apply 3D tomographic diagnostics recently developed by the PI to resolve flamelet/flow interactions in turbulent flames. The target properties include 3D flame surface density, flame volume, flame curvature, fractal dimension, 3D3C (three-dimensional, three-component) velocity fields, and also potentially local strain rate and turbulent flame speed. The success of this project will enable measurements of such properties in 4D for representative turbulent flames, and to establish multidimensional datasets that can be used for the development of computational tools for designing new energy devices. Furthermore, the project combines several distinct disciplines, including optical imaging, computed tomography, combustion, and the processing and analysis of large datasets. Results from the project will benefit practitioners in energy, photonics, and information technology.