突扩通道分叉现象的被动控制效果
Effect of Passive flow Control of Bifurcation Phenomenon in Sudden Expansion channel
摘要：
本文对突扩槽道流动进行了数值模拟。在当前研究中考虑了不同的几何膨胀比，例如1：2、1：3和1：4。研究了基线情况下的分叉现象，并使用通道中的被动修改来控制临界雷诺数。通过在突扩面处沿通道中心线引入二维平板，对突扩通道的几何形状进行了修正。这是被动控制技术之一，在本研究中已经探索。计算结果表明，临界雷诺数随板长的增加而增加。建立了临界雷诺数、控制板长度和膨胀比（h/H）之间的经验关系。根据经验关系式预测的不同板长下的临界雷诺数与计算结果吻合较好。
英文摘要：
In this article we describe, a numerical simulation has been performed for a channel flow with sudden expansion. Different geometric expansion ratios are considered in the current study such as 1:2, 1:3, and 1:4. The bifurcation phenomenon has been investigated for the baseline case and the critical Reynolds number is controlled using a passive modification in the channel. The geometry of sudden expansion channel is modified by introducing a two-dimensional plate along the center line of the channel at the expansion plane. This is one of the passive control techniques, which has been explored in the present study. The computations indicate that the critical Reynolds number of the symmetry-breaking bifurcation increases as the length of the plate increases. An empirical relation has been developed amongst the critical Reynolds number, length of control plates and expansion ratio (h/H). The critical Reynolds number predicted by the empirical relation for different plate lengths are in good agreement with computational results.
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