水噴流が空気圏を通って垂直水中突入する際に生じる狭いダクト内二次元吸込気泡流の挙動 : 第2報, ボイド率と気泡分布

概要

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In order to clarify the draft-tube-performance of cross-flow-turbines or the submerged-water-jet-performance, in the same two-dimensional aerated-bubbly-flow within a narrow duct reported previously, we experimentally systematically investigate the characteristic behavior of the mean-and the local-void fraction, of the vortical flow and of the bubble distribution, when the jet is vertically injected. It is shown that the mean-void fraction is a control parameter of the hydraulic losses, when the jet velocity is low. The intermediate vortical flow containing huge number of very fine bubbles often results in circulating string bubbles and fluctuates periodically at about 0.6s in period. Owing to the Daily's effects, the bubbles in the up-flow and in the down-flow are considerably concentrated into the intermediate vortical flow.
一般社団法人日本機械学会の論文
2000-04-25