翼型に発生するクラウド・キャビテーションの非定常構造

概要

論文の詳細を見る
The structure of flow around unsteady cloud cavitation on a steady two-dimensional hydrofoil was investigated experimentally, using a conditional sampling technique. The unsteady velocity around cloud cavitation was measured by a LDV and matched with the unsteady cavitation appearance taken by a high speed camera. This matching procedure was performed, using data of pressure fluctuation measurement on the foil surface. The velocity fluctuations could be divided into a large-scale (low frequency) component and small-scare (high frequency) one, using Fourier analysis. The unsteady cloud cavitation corresponds with the large-scale structure. In this manner, both large-scale (coherent) and small-scale (incoherent) structure of the flow around the cloud cavitation were clarified and discussed respectively. Main results are given as follows ; (1) Cloud cavitation observed at the present research is a kind of large-scale vortex cavitation whose rotation direction is clockwise when main flow direction is from left to right. The velocity of cloud cavitation is much lower than the uniform flow velocity. (2) The small-scale velocity fluctuation is not distributed uniformly in the large-scale structure, but concentrated near the edge of it. One of the reasons might be that cloud bubbles collapse there. (3) Three-dimensional structure of cloud cavitation is a stretched vortex whose configuration looks like a "croissant".
社団法人日本船舶海洋工学会の論文

翼型に発生するクラウド・キャビテーションの非定常構造

スポンサーリンク

概要

著者

関連論文

スポンサーリンク