Development of ultra-high-resolution optical-fiber probe for the measurement of fluctuation concentration of multiple species by the discrete light-absorption spectrometric method

为了研究液相中常见的高施密特数多组分的混合/反应场，采用离散光吸收光谱法研制了微尺度分辨率的超高分辨率光纤探针。利用该探针测量了具有二阶化学反应的湍流平面液体射流中所有化学物质的浓度，研究了反应浓度统计的基本特征，为概率密度函数（PDF）方法中分子混合模型的检验提供了有用的数据。进一步检测了湍流区和非湍流区之间的界面，并测量了湍流区的各种条件统计量。这些结果阐明了湍流/非湍流界面附近化学物质混合的机理。

In this study, to investigate the mixing/reactive fields of high-Schmidt number multiple species which are typically observed in the liquid phase, the ultra-high-resolution optical-fiber probe with the resolution of micro-scale order has been developed by the discrete light-absorption spectrometric method. By using this new developed probe, in a turbulent planar liquid jet with a second-order chemical reaction, the concentrations of all chemical species are measured, and the fundamental characteristics of reactive concentration statistics are investigated and the useful data for the examination of the molecular mixing model in the PDF (Probability Density Function) method are provided. Further the interface between the turbulent and non-turbulent region is detected and the various conditional statistics in the turbulent region are measured. From these results, the mechanism of mixing of chemical species near the turbulent/non-turbulent interface is clarified.