Abstract
Explanation of injected fuel and air mixture formation process in combustion chamber is necessary to reduce exhaust gas of a car. The shape of fuel jet is shown quantitatively by fractal dimension. And the unsteady jet shape characteristic is clarified. Till now, helium jet has been visualized by the Schilieren method. By this method, the three dimensional data on a jet is photography in two dimensions, and it cannot extract only the outline of a jet. So water jet with tracer is injected into a water, and the two dimensional section of a jet was visualized by the laser light sheet method. The photograph of jet is taken by high speed camera. The outline of jet was extracted by image processing. The jet shape characteristic was found by searching for a fractal dimension. And it becomes clear that the jet shape characteristic changes with differences in nozzle shape (diameter and length).
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