統計解析手法を用いた流場の画像計測システムの開発

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An image measurement system by means of statistical analysis has been developed. The number of tracer particle passing in a time is proportionate to the speed when the concentration of particle is uniform through the flow field. The present image measurement method evaluates the flow speed by means of the probability of the tracer particle passing which can be measured through the probability of tracer-edge passing. The difference function of binarized image data gives two pulse-like signal in a particle edge, and the interval and period of the signal are inversely proportional to the flow speed, and that form is depend on only the shutter time. The mean of the absolute value of difference function obtained from binarized image data is used as the measure of flow speed, and is estimated by means of the ensemble average of the measured data. The absolute value of flow velocity can be obtained through the present developed system, and it is suitable for the measurement of time-mean velocity. Measurement of rotating speed of particle patterned disk and wake distribution of circular cylinder in low Reynolds number has been made. A correction method considering the difference of particle concentration has been proposed, and applied on a rotating disk which has two area of different particle pattern concentration. Present measurement system can be applied not only the 2-D flow field but also 3-D, and will decrease the measurement time of wake distribution compare with the ordinary devices.
社団法人日本船舶海洋工学会の論文
1995-09-25

統計解析手法を用いた流場の画像計測システムの開発

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