| Citation: | LIU Zhirong, ZOU He, LIU Jinsheng, et al. Effect of angle of slit on shedding vortex of slotted circular cylinder[J]. Journal of Beijing University of Aeronautics and Astronautics, 2017, 43(1): 128-135. doi: 10.13700/j.bh.1001-5965.2016.0058(in Chinese)
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Vortex shedding from a circular cylinder with a slit which belongs to the unsteady flow of bluff bodies has very strong application prospects. However, it is still difficult to fully understand the complex flow phenomenon. Using flow visualization and particle image velocimetry (PIV) measurement, we explored the influence of a slit on the flow field structure. Adopting the method of proper orthogonal decomposition (POD), we reconstructed the flow field in the series of operations on PIV data. The experimental results show that the flow in the slit demonstrates periodic motion, and this oscillating vent-flow greatly alters the near wake flow features within a certain range of Reynolds number. Shedding vortex frequency of slotted cylinder has certain sensitivity with the angle of slit. The Strouhal number increases gradually with the increase of the angle, and the Strouhal number of slit ratio (slit/diameter) equals to 0.15 is more stable than that of slit ratio equals to 0.10.
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