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

A.项目总结该合同将用于采购一套由YAG泵浦的现代化染料激光系统，用于同时使用粒子图像测速仪(PIV)和平面激光诱导荧光(PLIF)对羟基(OH)和甲基炔(CH)进行研究。它用于燃烧和推进中重要的湍流扩散火焰的基础研究。通过同时使用PIV和CH-PLIF，有可能以独特的方式解决两大类基本问题：(A)火焰表面上的速度、应变率和停留时间，如CH所示，从喷射喷嘴到所附扩散火焰的火焰尖端；以及(B)从火焰升起到火焰熄灭的火焰稳定区的性质。这些结果提供了对基本火焰结构和火焰稳定性的新理解，并提供了一个数据库，用于与这些流动的大涡模拟(LES)进行比较。研究的更广泛影响涉及到燃烧系统基本知识的获取。能源在21世纪仍将是一个主要问题，燃烧将是其中的一大部分，因此这在很大程度上有助于能源问题。这些研究还将学生培养成博士水平，从而培养出一支训练有素的技术劳动力队伍，这增加了国家的竞争力；这些学生，包括代表性不足的少数族裔，在电子、计算机、光谱学、高功率激光和燃烧的所有方面都有充分的经验。

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.