統計解析手法を用いた流場の画像計測システムの開発(第4報) : 船尾後流分布計測への応用

抄録

An image measurement system of velocity field by means of statistical image analysis was developed. It was applied to a measurement of ship wake flow. Present technique is constructed with the fact that the provability of tracer particle passing through a target point in flow field is proportional to the concentration of particle and the flow speed. It enables to measure three-dimensional flow field using single CCD camera and laser light sheet. The principle of the measurement is describe by the constrain equation of visualized flow image, and it is extended to apply to the measurement in velocity vector field. The time-averaged flow speed distribution can be obtained by the present system. The time-averaged data is often useful in the engineering problems. The ship wake flow obtained by the present system shows the typical characteristics. The comparison of the measured results between the present system and the conventional Pitot tube show good agreement.