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.
"},{"@language":"ja","@value":"本報では，非定常蒸発ガソリン噴霧を対象にエキサイプレックス蛍光法を用いた気液相二相の領域における蒸気形成過程の実験的な解析を報告する．本研究では，混合気の平均温度を用いて気液相二相領域の蒸気濃度を算出する画像処理法を開発した．本手法は，気相と液相間の蛍光の混信を考慮したものであり，これを蒸発過程にあるガソリン噴霧に適用した．その結果，噴霧の内部と外縁では異なる蒸発過程をとることがわかった．
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