[논문]Time-resolved particle image velocimetry measurement of vortex dynamics behind tandem self-oscillating inverted flags in a channel flow

Chen, Yujia; Deng, Zhiwen; Liu, Yingzheng

doi:10.1016/j.expthermflusci.2019.109982

Time-resolved particle image velocimetry measurement of vortex dynamics behind tandem self-oscillating inverted flags in a channel flow

Experimental thermal and fluid science : ETF science, v.112, 2020년, pp.109982 -

Chen, Yujia (Key Lab of Education Ministry for Power Machinery and Engineering, School of Mechanical Engineering, Shanghai Jiao Tong University) , Deng, Zhiwen , Liu, Yingzheng

Abstract ▼ AI-Helper

Abstract The coupled flapping behaviors of two tandem inverted flags and the resultant vortex dynamics in a turbulent channel flow were experimentally determined using time-resolved particle image velocimetry (TR-PIV). The highly unsteady flow fields near the tandem self-oscillating flags with dimensionless separation distances of G* = 1, 1.5, 2, 2.5 and 3 were measured using time-resolved particle image velocimetry. Furthermore, the instantaneous flag profiles were successfully identified by the structure boundary detection algorithm. The time histories of the displacement of the monitor points indicated that the front and rear flags flapped synchronously with a constant phase difference, which was linearly dependent on the separation distance. The flapping amplitude of the rear flag was inferior to that of the front flag. A vortex pair (P) and a single vortex (S) shedding from the front flag were observed in the phase-averaged velocity vector maps and vorticity strength contours. The leading edge vortex excited an anti-rotating wall-induced vortex, which had the potential to disturb the thermal boundary layer, enhancing the wall heat removal performance of the channel flow. The phase-averaged pressure fields were estimated to understand the interactions between the flapping flags and the surrounding fluid. The vortex destruction process decreased the pressure difference on both sides of the rear flag, resulting in the attenuation of the rear flag’s flapping amplitude. Finally, the cross-correlation between the flag’s displacement and the fluid’s velocity fluctuation demonstrated that the front flag’s trailing edge vortex traveled downstream and encountered the rear flag with a constant convecting velocity, which explained the linear dependency of the phase difference between the tandem flags on their separation distance. Highlights Vortex dynamics behind tandem inverted flags in a channel flow were determined. Influence of two flags’ separation distance on the unsteady flow was obtained. The leading-edge vortex excited an anti-rotating wall-induced vortex. Pressure field was estimated from PIV to understand the flag-fluid interaction. Vortex destruction process decreased the pressure difference on the rear flag.

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Time-resolved particle image velocimetry measurement of vortex dynamics behind tandem self-oscillating inverted flags in a channel flow

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