Study of Mechanism of Ring-Like Vortex Formation in Late Flow Transition
Study of Mechanism of Ring-Like Vortex Formation in Late Flow Transition
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DOI：
10.2514/6.2010-1456
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发表时间：
2010-01
期刊：
影响因子：
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通讯作者：
Chaoqun Liu;Lin Chen
中科院分区：
文献类型：
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作者：
Chaoqun Liu;Lin Chen
本文对单个和多个环状涡的形成机理进行了新的研究。现有的理论有两种，一种认为环状涡是由剪切层产生的，另一种认为环状涡的产生遵循Crow理论。根据我们最近的DNS结果，提出了一个新的假设，即环形涡的产生是由涡管与流向涡的相互作用引起的。环头和环颈的形成是初生流向涡和次生流向涡相互作用的结果。多重环状涡的产生遵循第一Helmholtz涡守恒定律。这项新的DNS研究揭示了许多新的未知现象，提出了机制，并建立了新的理论
In this paper a new study for the mechanism of the single and multiple ring-like vortex formation is presented. There were two existing theories, one believes the ring-like vortex is produced by the shear layer and the other thinks the ring-like vortex generation follows the Crow theory. According to our recent DNS results, a new hypothesis is presented that the ring-like vortices generation is caused by the interaction between the �-shaped vortex tube and streamwise vortices. The formation of ring head and ring neck are the results of the interaction between the prime streamwise vortices and secondary streamwise vortices. The multiple ringlike vortex generation is following the first Helmholtz vortex conservation law. A number of new unknown phenomena are revealed, mechanisms are presented and new theories are established by this new DNS study Nomenclature