MRI: Acquisition of a High-Speed Laser-Based Imaging System for Fluid Mechanics, Combustion, and Physical Chemistry

高速激光成像系统是流体力学、燃烧和物理化学领域的研究人员阐明这些恶劣流场的复杂性的主要工具。该系统能够测量时间分辨的、特定物种的标量场和三维速度场，以了解高速流动中燃烧的起始和传播以及湍流的早期发展。这项技术提供了前所未有的途径，了解受混合和过渡边界层影响的湍流反应流的物理细节。新仪器将用于拉斐特学院的研究和学生培训，这是一所位于宾夕法尼亚州伊斯顿的私立文理学院，拥有工程学。该系统还将用于为本科生提供有意义的参与几个系的许多最先进的研究项目。此外，测速和高速可视化能力将被纳入机械和化学工程提供的初级和高级课程。化学专业的学生将有机会在新的实验室体验中进行荧光实验和时间相关光谱测量。该系统将显著增强让不同背景的本科生参与有意义的研究的能力，并将先进的研究能力纳入本科课程。拟议的基于高速激光的成像系统使丰富的不同光学技术能够应用于可压缩流动中的混合和燃烧研究以及湍流边界层中相干结构的表征。它将极大地增强拉斐特现有的流体力学、燃烧和物理化学研究设施的能力，特别是支持以下几个研究部分：i)研究混合效率和有限速率化学对高超声速流动中非预混燃烧的作用，ii)使用预混高超声速反应流的时间分辨成像来探索点火、火焰保持和熄灭现象，iii)表征发夹涡和湍斑的发展和卷吸行为及其在湍流和过渡流中所起的作用。Iv)评估特种生物柴油混合燃料的燃烧性能，v)利用时间相关的单光子计数测量有机薄膜材料的磷光寿命，vi)产生活性氧并测量与硫醇相互作用的猝灭速率，以确定其在淡水环境中的解毒能力。这些研究领域中的每一个都依赖于该系统实现的高速、高功率、可调的照明和成像能力。

A high-speed laser-based imaging system is a primary tool for researchers working in the area of fluid mechanics, combustion, and physical chemistry to illuminate the complexities of these harsh flowfields. The system is able to measure time-resolved, species-specific scalar fields and three-dimensional velocity fields to understand the initiation and propagation of combustion in high-speed flows as well as the early development of turbulent flows. This technology provides unprecedented access to the details of the physics of turbulent reacting flows influenced by mixing as well as transitional boundary layers. The new instrumentation will be utilized for both research and student training at Lafayette College, a private liberal arts college with engineering located in Easton, PA. The system will also be used to provide undergraduate students with meaningful involvement in many state-of-the-art research programs across several departments. Additionally, the velocimetry and high-speed visualization capabilities will be incorporated into junior level and senior level courses offered by both Mechanical and Chemical Engineering. Chemistry students will have the opportunity to perform fluorescence experiments and time-correlated spectroscopy measurements in new laboratory experiences. The system will significantly augment the ability to involve undergraduates of diverse backgrounds in meaningful research as well as incorporate advanced research capabilities into the undergraduate curriculum.The proposed high-speed laser-based imaging system enables a wealth of diverse optical techniques to be applied to the study of mixing and combustion in compressible flows and the characterization of coherent structures in turbulent boundary layers. It will dramatically augment the capabilities of existing fluid dynamic, combustion, and physical chemistry research facilities at Lafayette, specifically supporting several research components: i) Examining the role of mixing efficiency and finite rate chemistry on non-premixed combustion in hypersonic flows, ii) Exploring ignition, flameholding, and extinction phenomena using time-resolved imaging of pre-mixed hypersonic reactive flow, iii) Characterizing the development and entrainment behavior of hairpin vortices and turbulent spots and the roles they play in turbulent and transitional flows. iv) Assessing the combustion properties of specialty biodiesel fuel blends, v) Measuring the phosphorescence lifetimes of organic thin film materials utilizing time correlated single photon counting, and vi) Generating reactive oxygen and measure quenching rates due to interaction with thiols to determine their detoxification capability in freshwater environments. Each of these research areas relies on the high-speed, high-power, tunable illumination and imaging capabilities enabled by this system.