Effects of upstream side-cavity on mass and momentum exchange properties in the downstream side-cavity of open-channel flows
Effects of upstream side-cavity on mass and momentum exchange properties in the downstream side-cavity of open-channel flows
复制标题
上游侧腔对明渠流下游侧腔质量和动量交换特性的影响
DOI：
10.2208/journalam.6.951
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
Y. Mitsunari
中科院分区：
文献类型：
--
作者：
I. Nezu;M. Yano;Y. Mitsunari
在本研究中，对侧腔明渠内及其周围的铺层（即vvando流）进行了测量。实验条件是在下游方向连续设置两个不同长宽比的侧腔。下游侧空泡的展弦比固定为2.0，而上游侧空泡的展弦比分别为2.0、5.0和10.0。这两个侧腔之间的距离被改变为四种模式。对尾流侧腔进行了测量。上游侧空泡的作用使时均流速的流向向主通道方向改变。随着上游侧空泡展弦比的增大，下游侧空泡的流入和流出均增大。结果表明，在增大侧腔长径比和减小侧腔间距的条件下，侧腔的质量交换比增大，剪切层的位置发生变化，雷诺应力和动量分布增大。
In this study, Ply measurements in and around side-cavities open-channel , i.e. vvando flows, were conducted. The expaimental condition is that two side-cavities were set continuously in the downstream direction with various aspect ratios. The aspect ratio of the downstream side-cavity was fixed to2 .0, whereas, that of the upsteam side-cavity was changed to 2.0, 5.0 and 10.0. The distance between these two side-cavities was changed to four kinds of patterns. Measurements were carried out for the dovvnstream side-cavity . The flow direction of the time-averaged velocity was changed to the main channel direction by the effects of upstream side-cavity . As the aspect ratio of the upstream side-cavity increased, the inflow and outflow increased in the downstream side-ca.vity. As the results, the mass exchange ratio was increased The positions of shear laye were changed and the Reynolds stress and momentum distribution were increased The above results were observed in the condition that the aspect ratio of the upstream side-cavity was increased and the interval of side-cavities was decreased.