A Laser System for Simultaneous Partcle Image Velocimetry (PIV) and Planar Laser-Induced Fluorescence (PLIF) Combustion Studies

A.项目概述该合同提供了一个现代化的YAG泵浦染料激光系统的收购，以执行同时采用粒子图像测速（PIV）和平面激光诱导荧光（PLIF）的羟基（OH）和次甲基（CH）的研究。 这是用于基础研究的湍流扩散火焰的兴趣在燃烧和推进。 通过同时使用PIV和CH-PLIF的组合，可以以独特的方式解决两大类基本问题：（a）在从射流喷嘴到附着扩散火焰的火焰尖端的位置处由CH标记的火焰表面上的速度、应变率和停留时间;和（B）跨越从火焰升起到火焰熄灭的范围的火焰稳定区域的性质。 这些结果提供了新的理解的基本火焰结构和火焰稳定性，和一个数据库比较大涡模拟（LES）这些flowsThe更广泛的影响的研究涉及到收购的基本知识的燃烧系统。 能源将仍然是21世纪的一个主要问题，燃烧将是其中很大的一部分，因此这广泛地有助于能源问题。 这些研究也培养学生的博士学位。这些学生，包括代表性不足的少数民族学生，在电子、计算机、光谱学、高功率激光和燃烧等各个方面都有丰富的经验。

A. PROJECT SUMMARYThis award provides for acquisition of a modern, YAG-pumped dye laser system to perform studies employing simultaneously particle image velocimetry (PIV) and planar laser-induced fluorescence (PLIF) of hydroxyl (OH) and methyne (CH). This is used in fundamental studies of turbulent diffusion flames of interest in combustion and propulsion. By using simultaneously the combination of PIV and CH-PLIF it is possible to address, in a unique way, two broad classes of fundamental problems: (a) the velocity, strain rate, and residence time on the flame surface as marked by CH at locations ranging from the jet injection nozzle to the flame tip of an attached diffusion flame; and (b) the nature of the flame-stabilization region spanning the range from flame liftoff to flame blowout. These results provide new understanding of fundamental flame structure and flame stability, and a database for comparison to large-eddy simulations (LES) of these flowsThe broader impacts of the research relate to the acquisition of fundamental knowledge of combustion systems. Energy will remain a major issue in the 21st Century and combustion will be a large part of this, so this broadly contributes to energy issues. These studies also train students to the Ph.D. level, thus producing a highly trained technical workforce which adds to national competitiveness; these students, including under-represented minorities, are fully experienced in all aspects of electronics, computers, spectroscopy, high-powered lasers and combustion.