平面レーザ誘起蛍光法によるガソリン機関燃焼室内のOHラジカルの分布計測

概要

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Planar laser-induced fluorescence (PLIF) was applied to 2-D visualization of OH radical distribution in a combustion chamber of a single-cylinder spark ignition engine. A Nd : YAG laser-pumped pulsed dye laser with frequency doubling was used to form a sheet of laser light which induced the OH X^2Π→A^2Σ transition. Fluorescence images of the OH radical and visible images of flames were simultaneously imaged by a pair of image-intensified CCD cameras. The OH distributions in the combustion chamber were measured under various conditions of mass burned rates, swirl rates and air-fuel ratios. The OH images were very complicated in structure compared with the visible images. The OH distributions were not only observed near the flame front but also observed in the reaction zone behind the flame front. The OH fluorescence intensity reached a peak value at the swirl rate at which the HC emission indicated a low value. Both the OH fluorescence intensity and the NO_x emission had peaks at the near-theoretical air-fuel ratio.
一般社団法人日本機械学会の論文
1994-06-25