中文摘要：

在柱体的 wake 并且在免费溪流的一根灵活细丝的实验在一条垂直肥皂电影隧道被进行。实验清楚地设想了细丝的运动。基于试验性的运动学的结果，一个 2-d 面板方法被用来计算力量作用于细丝。实验和数字结果揭示了那与那不同在免费溪流，在在象旋涡街的一样的频率的 Karman 旋涡街 flapped 的细丝，并且与更小的振幅和更大的弯曲。细丝在 Karman 旋涡街承受了明显的戳，当时一 drag 出现在免费溪流的情况中。在细丝和 Karman 旋涡街的运动之间的阶段关系上的 drag 系数的依赖也被学习。

英文摘要：

Experiments of a flexible filament in the wake of a cylinder and in free stream were conducted in a vertical soap film tunnel. The experiments distinctly visualized the movement of the filament. Based on the experimental kinematic results, a 2-d panel method was used to calculate the forces acting on the filament. The experiment and numerical results revealed that different from that in free stream, the filament in Karman vortex street flapped at the same frequency as the vortex street, and with smaller amplitude and larger curvature. The filament suffered an evident thrust in Karman vortex street, while a drag appeared in the case of free stream. The dependence of the drag coefficient on the phase relation between the movement of the filament and the Karman vortex street was also studied.