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A Passive Method to Control the Wake Flow behind a Circular Cylinder
| Content Provider | Semantic Scholar |
|---|---|
| Author | Chen, Wenli Li, Donglai |
| Copyright Year | 2017 |
| Abstract | Characteristics of flow around a modified circular cylinder are experimentally investigated in the present study. The cylindrical test model is modified with a slit parallel to the incoming airflow to create a flow communicating channel between the windward and leeward stagnation points and the experimental campaign was performed in a wind tunnel at the Reynolds number of Re=2.67×104. The slit width S changes from 0.05 D to 0.15 D with an increment of 0.025 D. Experiment results reveal that a slit contributes to reducing the drag and suppressing the fluctuating amplitude of the dynamic wind loads acting on the test model. The PIV measurement results demonstrate clearly that the slit generates a selfissuing jet into the cylinder wake and the passive jet is effective in manipulating the wake vortex shedding process from the circular cylinder. As the jet vortices being shifted downstream, they help to detach the shear layers rolled up from both sides of the circular cylinder. Because of this dynamic interaction process, the antisymmetric pattern of the wake vortex shedding from a natural cylinder is found to be converted to a bistable mode flow behind the slotted cylinders. As a result, the dimensionless vortex shedding frequency is observed to be switched to a very low level and a flip-flop phenomenon is found. |
| File Format | PDF HTM / HTML |
| DOI | 10.2514/6.2017-0955 |
| Alternate Webpage(s) | http://www.aere.iastate.edu/~huhui/paper/2017/AIAA-2017-0955-WL-Chen.pdf |
| Alternate Webpage(s) | https://doi.org/10.2514/6.2017-0955 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
