Quantitative Analysis of Vapor Formation Process in Gasoline Spray in Evaporation Field with Laser Induced Exciplex Fluorescence Method (LIEF Method)

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  • エキサイプレックス蛍光法（LIEF法）を用いた蒸発場におけるガソリン噴霧内の蒸気形成過程の定量的解析

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<p>This paper reports the quantitative analysis of vapor concentration in the two-phase mixture region of liquid and vapor with Laser Induced Exciplex Fluorescence（LIEF）for the unsteady evaporating gasoline type spray. The exciplex fluorescence method, developed by Melton, is a method to optically separate the fluorescence from the liquid and vapor phases, but quantitative analysis of vapor concentration in the two-phase mixture region of liquid and vapor is difficult due to fluorescence cross talk. In this study, iso-octane（92 vol%）, benzene（4 vol%）, and triethylamine（4 vol%）were used as fluorescent agents that emit excited complex fluorescence. This fluorescence can optically separate from the liquid phase and the vapor phase, respectively. I tested the dependence of the fluorescence characteristics on the vapor concentration, ambient pressure, and ambient temperature to quantify the vapor spatial concentration. The relationship between the vapor concentration and the fluorescence intensity ratio was equivalent to the theoretical relationship. Furthermore, the relationship among the fluorescence intensity ratio and ambient conditions could be considered by the formulation1). For quantitative measurement, I used the image analysis method of vapor spatial concentration quantification measurement in direct injection diesel spray developed by Senda et al. The method was used to quantify the vapor spatial concentrations in the two-phase mixture region of liquid and vapor by image processing that considered the fluorescence cross talk between the liquid and vapor phases2). The resulting spatial concentration distribution of the liquid phase in the two-phase mixture region of liquid and vapor in the spray cross section is shown in Figure 1.</p>

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