画像処理法によるポンプ水車羽根車内流れ計測

概要

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Fluid flow in a small model of a Francis-type pump turbine was visualized by means of a tracer method and was imaged using a video camera rotating with the rotor. The relative velocity vectors of the fluid flow were analyzed from the video image using a digital image processing technique based on the correlation method. The flow pattern was discussed in relation to the characteristics of the pump turbine. At a zero incidence condition the reverse flow zone on the suction surface of the blade was much less than that at a shockless inlet condition. An unsteady flow pattern at a low flow rate was also demonstrated. The problems in the image processing technique and countermeasures such as image improvement and size selection of the correlation matrix were also discussed.
社団法人日本機械学会の論文
1993-11-25