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钝后缘刨面物体近涡结构雷诺数相关性
发布时间：
2015-10-26 11:05
来源：北京欧兰科技发展有限公司
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钝后缘刨面物体近涡结构雷诺数相关性 |
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The three dimensional near wake flow topology behind a blunt trailing edge flat plate is
investigated for a Reynolds number range varying from 500 to 4.6x104 using a combination of
flow visualization, numerical simulations and experiments. The secondary wake instabilities are
identified using vorticity maps from CFD and performing Proper Orthogonal Decomposition
(POD) on PIV data from experiments to identify the underlying dominant coherent structures.
These structures are found to appear at a spanwise spacing ranging from 2.2 to 4.8. At higher
Reynolds numbers the secondary wake instabilities appear to be unsteady in space and time.
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