Two-color Fluorescence ratio method to measure instantaneous mole fraction and density in compressible mixing field

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Fast mixing of fuel and air is one of the most important technical subjects to realize hypersonic air breathing engines. In order to measure instantaneous distribution of fuel mole fraction, we tried to develop a new technique using laser induced fluorescence signals of two tracer gases. We investigated fluorescent characteristics of several candidate matters and selected acetone and toluene as the tracer gas. We tested fluorescent characteristics of their mixture in air and other gases.