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

燃料与空气的快速混合是实现高超声速吸气式发动机的重要技术课题之一。为了测量燃料摩尔分数的瞬时分布，我们尝试开发一种利用激光诱导两种示踪气体的荧光信号的新技术。我们研究了几种候选物质的荧光特性，并选择丙酮和甲苯作为示踪气体。我们测试了它们的混合物在空气和其他气体中的荧光特性。

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.