流跡画像の解析による三次元流れの一計測法

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  • A measuring method for three-dimensional flow by an analysis of pathline pictures.
  • リュウセキ ガゾウ ノ カイセキ ニ ヨル 3ジゲン ナガレ ノ イチケイソク

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The authors propose a method of measuring a 3-D flow field by digital image processing for pathline pictures. In this method, a 3-D flow field is measured by the measurements of two 2-D flow fields perpendicularly intersecting each other. A still camera, a color reversal film, halogen lamps, two flash units and red cellophane papers are used to photograph the pathlines of tracer particles in a measurement section. Each of the photographed pathlines in the measurement section has a brilliant white initial point, a bright red terminal point and a red middle part with intermediate intensity. The pathline picture on a film is twice entered into a personal computer by a video camera through a video memory. First, the initial point of the pathline and next the whole of the pathline are entered. The pathline picture is analyzed by the authors' original program and velocity vectors are obtained. As an application of this method, 3-D flow field in an agitated vessel was measured.

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