物理学报Issue(19)：289-299,11.DOI:10.7498/aps.62.194702
圆管潜射流生成偶极子涡特性实验
Experiments on vortex dipoles generated by a submerged round jet
摘要
Abstract
The formation mechanism and evolution characteristics of a submerged round jet in a uniform fluid of finite depth are investigated experimentally. A spillover system is designed to produce a continuous horizontal jet in the background fluid with a constant velocity, and the flow is visualized by the dyed liquid. Experiments are conducted under different combinations of Reynolds number Re, confinement number C and nondimensional draft d/H , where d is the vertical distance from the jet to the free surface, and H is the depth of the ambient fluid. Four flow patterns are identified for various C. When C<1, the jet shows a deep-water pattern, while for 1 6 C<2, it shows the transitional pattern, the jets do not develop a structured flow for the two jet patterns. When 2 6 C<10, the jet shows the shallow-water pattern, while if C>10, the jet shows the extreme-shallow-water pattern. In both these two patterns, the jets generate vortex dipole structures. In the extreme-shallow water pattern, the nondimensional vortex formation time t*f for the vortex dipole structure is proportional to the nondimensional injection time Ti*nj for various draft d/H . In the shallow-water pattern, t*f depends linearly on Ti*nj Re1/2 when the draft d/H=0.5;however, there is no observable relationships between t*f and Ti*nj for other draft d/H .关键词
圆管潜射流/限制数/偶极子涡结构/形成时间Key words
submerged round jet/confinement number/vortex dipole/formation time引用本文复制引用
陈科,尤云祥,胡天群..圆管潜射流生成偶极子涡特性实验[J].物理学报,2013,(19):289-299,11.基金项目
国家自然科学基金(批准号:11072153)和海洋工程国家重点实验室基金(批准号:GP010819)资助的课题 （批准号:11072153）
