バタフライ弁まわりの高壊食性渦キャビテーションの高速写真観察

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  • High-Speed Observations of Highly Erosive Vortex Cavitation around Butterfly Valve.
  • バタフライベン マワリ ノ コウ カイショクセイ ウズ キャビテーション ノ

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In order to clarify the mechanism of the severe erosion mainly resulting from the singular vortex cavitation, we carefully observe the vortex cavitation associated with the erosion around a butterfly valve by means of a high-speed video camera, whose framing rate is 40500 per second. The velocity of cavitating flow is measured by the digital-image processing technique. It is worth noting that the vortex cavitation develops in the boundary region between the main flow region, i. e., the orifice-jet, and the recirculating region. The cavitating vortex core consists of several tiny vortex cavitations. The rotating velocity of the highly erosive vortex cavitation can also be determined by this technique.

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