Acquisition of a High-Pulse-Energy, Narrow-Linewidth, UV Laser Source: Improved Quantitative Gas-Phase Mixing Measurements in Turbulent Spray Flows

1336913Sutton该项目涉及购买组件，以组装超高脉冲能量(300 MJ/脉冲，254 nm)、可调、窄线宽(~30 MHz)UV激光系统。该仪器将是紫外线过滤瑞利散射(FRS)测量系统中的主要部件，用于研究湍流喷雾流动中的汽化和气相混合过程。随后使用新的紫外激光和FRS系统的实验将以碳氢化合物火焰的气相测温为目标，这将产生关于煤烟传输和反应化学的新信息。也许最著名的湍流喷雾存在于能量转换系统中，在能量转换系统中，液体燃料进入氧化环境，蒸发，并在反应之前与氧化剂混合。多相喷雾环境中的气相混合问题尚未得到广泛的研究，这主要是由于液相的共存，使得气相浓度的独立测量变得非常困难。PI将使用新的高能UV激光器(254 Nm)和原子汞过滤器一起进行UV FRS测量，以进行定量的气相测量，而液滴的干扰最小。大多数工程系统使用由多个阶段组成的工作介质进行操作，这一事实解决了该项目的更广泛影响。特别是在汽车发动机、液体推进剂火箭发动机、工业熔炉和燃气轮机等许多应用中，喷雾流动具有重要的应用价值。随着对汽化和气相混合过程有了更好的了解，燃油喷射器和燃烧室设计的改进将成为可能，从而改善点火控制，并有可能提高效率、增强稳定性和减少污染物排放。在与研究有关的教育方面，拟议的激光系统将供博士后研究人员和本科生/研究生使用，以加强他们在最先进测量技术方面的培训。我们的技术未来有赖于开发新的方法和一支能够处理这些复杂问题的新劳动力。

1336913SuttonThis project involves the acquisition of components to assemble an ultra-high-pulse-energy (300 mJ/pulse at 254 nm), tunable, narrow-linewidth (~ 30 MHz) UV laser system. This instrument will be the primary component used within a UV filtered Rayleigh scattering (FRS) measurement system to investigate vaporization and gas-phase mixing processes within turbulent spray flows. Subsequent experiments using the new UV laser and FRS system will target gas-phase thermometry in sooting hydrocarbon flames which will yield new information concerning soot transport and reaction chemistry. Perhaps the best known examples of turbulent sprays exist in energy conversion systems in which a liquid fuel issues into an oxidizing environment, evaporates, and mixes with the oxidizer before reacting. Gas-phase mixing has not been studied extensively in multi-phase spray environments primarily due the co-existence of the liquid phase that makes the independent measurement of the vapor-phase concentration very difficult. The PI will use the new high-energy UV laser (254 nm) in conjunction with an atomic mercury filter to perform UV FRS measurements for quantitative gas-phase measurements with minimal interference from the liquid-phase droplets. Broader impacts of the project are addressed by the fact that the majority of engineering systems operate with working mediums that consist of multiple phases. In particular, spray flows are of significant interest in many applications including automotive engines, liquid-propellant rocket engines, industrial furnaces, and gas-turbines. With a better understanding of the vaporization and gas-phase mixing processes, improvements in fuel injector and combustor design will be possible, resulting in an improved control over ignition and a potential for increased efficiency, increased stability, and decreased pollutant emissions. In terms of research-related education, the proposed laser system will be used by post-doctoral researchers and undergraduate/graduate students to enhance their training in state-of-the art measurement techniques. Our technological future depends on developing both new methodologies and a new workforce capable of tackling such complicated problems.