科研之友
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摘要
The dynamics of the vorticity distribution for an unsteady, laminar necklace vortex system are established using quantitative particle image velocimetry techniques. The vortex system is composed of necklace vortices, which form periodically in front of a bluff body junction, translate toward the body, and subsequently amalgamate with a sustained corner vortex. It is shown that cross-diffusion of the necklace vortex vorticity with opposite-sign vorticity generated by a necklace vortex-surface interaction is the dominant mechanism creating a vorticity balance in the system. The instability of the impinging shear layer, under the influence of the adverse pressure gradient generated by the presence of the bluff body, is proposed as the mechanism by which the periodic vortex system frequency is selected.
- 出版日期1997-6
