層状混合気の燃焼特性に関する研究 : 第1報, レーザ誘起NO_2蛍光法による定容燃焼器内混合気分布の計測

概要

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Laser-induced fluorescence from nitrogen dioxide (NO_2) as gas fuel tracer was applied to determine mixture stratification in a pancake type constant-volume combustion chamber using propane and hydrogen fuels. The second-harmonic output of a pulsed Nd : YAG laser was used as a light source for fluorescence excitation. the fluorescence images were corrected by a gated image-intensified CCD camera. The quantitative analysis of fuel concentration was made possible by the application of linearity between fluorescence intensity and NO_2 concentration at a low trace level. The stratified mixture (center-rich or center-lean) was concentrically formed in the central region of the chamber by a jet flow from a tangentially oriented port. The concentration difference in the radial direction of the chamber decreased with time from the start of injection. The rate of decrease was faster for hydrogen than for propane. After 300ms from start of injection, however, the time histories of the concentration (difference were nearly constant for both fuels regardless of overall concentration.
一般社団法人日本機械学会の論文
1996-06-25