Abstract
Although the spark tracing method is one of the most classical techniques of flow visualization, the measurement by this technique has been limited to a qualitative observation or to one-dimensional velocity measurement. Recently, the authors of this study have been succeeded in measuring the two-dimensional velocity field by applying the dynamic programming matching technique, which has commonly been used in the voice recognition, to the images obtain by the spark tracing. In order to increase the accuracy of this technique, the powder of aluminum oxide, which shows the radiant trails while they are burned by sparks, has been introduced to the flow. Presently, color information of the sparks is incorporated to the DP matching method and the well-known turbulent velocity field of an axisymmetric free jet is measured.
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