Research Initiation Award: Hydrocarbon Vapor Measurements in Two-Phase Flows by Infrared Extinction

燃油喷雾汽化是发动机运行中的一个关键阶段， 液体燃料燃烧装置。 目前，缺乏 蒸发喷雾的定量测量研究 的气相分布，一个限制的结果， 可用于测量蒸汽的测量技术。 一种非侵入式的、基于激光的红外消光技术， 基于对事件的强烈吸收而开发的 碳氢燃料在3.39波长处的辐射。 的 这项技术对精确定量 气相的测量，但是由于其有限的使用， 关于这项技术的准确性， 在两相流中。 为了充分评估准确性和 红外消光技术的局限性 量化燃料蒸发，提出了一个实验， 这些技术将被用于一个非常受控的 模拟喷雾 环境 模拟喷雾由固体组成 注入纯烃气体的聚苯乙烯球， 在研究喷雾的影响方面提供了很大的灵活性 蒸汽测量的准确性的特点。 最后，对光学系统提出了改进意见 以前用于红外消光的几何形状 技术，允许更精确的空间测量。 空间精度是成功应用 红外消光技术对脉冲喷雾和高 湍流

Fuel spray vaporization is a crucial phase in the operation of liquid fuel combustion devices. At present there is a lack of studies of evaporating sprays with quantitative measurements of the vapor phase distribution, a result of the limitations of the measurement techniques available for measuring vapor. A nonintrusive, laser based, infrared extinction technique has been developed based on the strong absorption of incident radiation at a 3.39 wavelength by hydrocarbon fuels. The technique holds great promise for accurate quantitative measurement of the vapor phase but, due to its limited use, little knowledge is available on the accuracy of the technique in two-phase flows. In order to fully assess the accuracy and limitations of the infrared extinction technique in quantifying fuel vaporization, an experiment is proposed in which the techniques will be used in a very controlled simulated spray environment. The simulated spray consists of solid polystyrene spheres injected with a pure hydrocarbon gas, providing great flexibility in studying the effects of spray characteristics on the accuracy of the vapor measurements. Finally, improvements are proposed in the optical system geometry previously used for the infrared extinction technique, allowing more spatially precise measurements. Spatial precision is vital to the successful application of the infrared extinction technique to pulsed sprays and highly turbulent flows.