Measurement of Three Dimensional Velocity Vectors in a Flow Field Based on a Spatio-Temporal Correlation Method

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  • 時空間相関法に基づく流れ場の3次元速度ベクトル計測

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A measurement system of three-dimensional velocity vectors is essential in analyzing a highly complex flow field.<br>This paper presents a new measurement method of three-dimensional velocity vectors in a flow field using a spatio-temporal correlation method. It is an advanced method for two-dimensional velocity vector measurement using correlation. The method needs two tracer particle images observed at a short distance in the flow direction. Each of the two images consists of frame time series. The two-dimensional information on velocity can be obtained using spatial correlation. In addition, the other one-dimensional information on velocity can be obtained using temporal correlation. Consequently, a three-dimensional velocity vector distribution is obtained by calculating spatio-temporal correlation between the two images. This system is actually applied to a steady flow field and the measurement uncertainty is evaluated.<br>In comparison with a conventional stereoscopic measurement method, in which each tracer is tracked in a three-dimensional space, there are the following advantages in this method.<br>1) The method has wide applications to flow visualization techniques because each tracer particle is not tracked but an image of tracer particles is observed as a spatial pattern.<br>2) A spatially high density vector distribution is obtained on a flow section.<br>3) The method fundamentally needs not any known information on the flow characteristics.

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