1554 フラクタル次元解析による非定常噴流の形状特性(G05-6 噴流(1),G05 流体工学)

概要

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In late years an environmental problem by global warming and air pollution is serious. It is important that shape of a fuel jet is analyzed to reduce a toxic substance. Jet shape is evaluated quantitatively by fractal dimension. A water jet including tracer is jetted underwater and a two-dimensional section of a jet is visualized by the laser light sheet method. A photograph of a jet is taken with a high-speed camera. An outline of a jet is extracted by image processing. The photography system was improved to evaluate a characteristic of a turbulence region precisely. By this improvement, the turbulence mixture characteristic of an unsteady jet is clarified by a fractal dimension. Influence of nozzle length is analyzed, as a result, the nozzle which length had a short showed the characteristic in which the fractal dimension increases in a turbulence region.
一般社団法人日本機械学会の論文
2007-09-07