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The particle image velocimetry based on the pattern correlation method has been successfully applied to the relative fluid flow in a small model of a Francis-type pump turbine by processing the video ...images pictured using a video camera rotating with the runner. The pattern correlation method has an inherent problem of erroneous velocity vectors due to erroneous correlation. The images of absolutely static fluid removing a runner were taken by a rotating video camera and they were analyzed using the pattern correlation method, where the connect velocity vectors are easily specified. The problems including the cause of erroneous velocity vectors which occur in the pattern correlation method and the countermeasures are discussed.続きを見る
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