Study on Generation of Periodical Large Surface Eddies in a Composite Channel Flow
Study on Generation of Periodical Large Surface Eddies in a Composite Channel Flow
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复合通道流中周期性大表面涡产生的研究
DOI：
10.1029/wr022i007p01129
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发表时间：
1986
影响因子：
5.4
通讯作者：
H. Ikeda
中科院分区：
文献类型：
--
作者：
N. Tamai;T. Asaeda;H. Ikeda
通过一组对比试验，确定了在复合槽流中，主槽与滩地交界处水面产生大涡的主要因素。结果表明，表面大涡不是类似沸腾的现象，而是界面局部剪切层产生的龙卷风旋涡。流动显示技术表明，在滩地顶缘附近存在着类似于纵向涡的倾斜涡管形式的复杂三维结构，并周期性地产生大的表面涡。通过二维稳定性分析，解释了这些现象的周期性是局部剪切层的首选模式。
A set of comparative experiments are employed to identify a predominant factor in the generation of large eddies on the water surface at the interface between the main channel and the floodplain in a composite channel flow. It is indicated that the large surface eddies are not phenomena whose action resembles boiling but tornadolike vortices generated by the local shear layer at the interface. Flow visualization technique showed that there existed a complicated three-dimensional structure in the form of inclined vortex tubes which behaved like longitudinal vortices near the top edge of the floodplain as well as periodically generated large surface eddies. The periodicity of those phenomena is explained as the preferred mode of the local shear layer with two-dimensional stability analysis.