低雷诺数下柔性薄板涡激振动流固耦合特性研究

柔性薄板的流固耦合特性研究在航空及能源动力领域具有广泛的应用背景，特别是在上游流体出现脉动的情况下，将引发薄板周期性振动，这种规律性的结构振动反过来又会改变其尾流的泻涡释放形态。本文基于非定常流动和柔性薄板振动理论，建立了柔性薄板的流固耦合特性研究模型，并得到了薄板的振动特性以及平板周围流场的非定常流动特性。结果表明：随着流体雷诺数的不同，柔性薄板的振动情况有明显的差异，当激振力的频率与柔性薄板固有频率一致时，会出现共振现象，柔性薄板振动对涡的形成产生抑制，保持薄板的附着流，延迟分离；当薄板的最大弹性回复力低于流体激振力时，薄板出现无规律的随机振动变形。

Fluid-Structure Interaction Turbulence Characteristic of the Thin Plate Vortex-Induced Vibration under Low Reynolds

The study of fluid-structure interaction of thin plate has broad applications in Air and energy power. Especially the flow under the upstream pulsation, will trigger the periodic vibration, the regularity of structure vibration would also change its vortex shedding form. Fluid-structure interaction analysis was base on the interaction between unsteady flow and the thin plate＇s vibration. The characteristics of the plate＇s vibration and the unsteady flow behaviors around the plate were obtained. Results reveal that as the distinctions of the flow velocity, the vibration situation are different. When the frequency of vibration force is equal to the natural frequency ,the thin plate can appear resonance phenomenon. The vibration of the thin plate restrains the formation of eddies. It can also remain the plate＇s attached flow and delay the flow separation. When the biggest elastic recovery force below fluid shock, thin plate appear erratic random vibration deformation.