Theoretical and experimental studies of the azimuthal instability of vortex rings generated by an oscillating disk
(0) The structures of the flow induced by a disk performing sinusoidal oscillations in fluid at rest are investigated mainly by means of flow visualization.We vary the Keulegan-Carpenter numbers between 0.3 and 1.5, and the Stokes numbers between 100 and 1200.Consistent with the linear stability analysis, we observe organized modes with clearly countable numbers of waves emerging as sequential vortex rings shedding from the oscillating disk.These organized modes can be further divided into two branches, which are distinguished by the phase properties of the vortical structures above and below the disk.The highest wavenumber m=9 is recorded in our visualization.
Flow instability vortex ring oscillating disk flow visualization
Jian Deng Jingyu Xue Lubao Teng Xueming Shao
State Key Laboratory of Fluid Power & Mechatronic Systems, Zhejiang University, Hangzhou 310027, Peoples Republic of China;Department of Mechanics, Zhejiang University, Hangzhou 310027, Peoples Republic of China
国际会议
The Second Conference of Global Chinese Scholars on Hydrodynamics(第二届全球华人水动学学术会议)
江苏 无锡
英文
89-94
2016-11-11（万方平台首次上网日期，不代表论文的发表时间）