不同雷诺数下弹性薄板流激振动实验

为了揭示流体-薄壁结构之间相互作用的机理,在4种不同的进口流动雷诺数下,采用3D-PIV流场测试系统和DH-5935N动态信号测试分析系统同步测试,分别得到方柱绕流后弹性薄板周围流场的时空演化特性和受激振动薄板的运动规律.实验结果表明,弹性薄板振动对流动雷诺数极其敏感,当周期性扰动流场与结构形成强烈的非线性耦合作用时,近壁区流动进一步受板扰动的影响,流动的边界条件发生改变,流场结构的对称性遭到破坏,受激振动板最终表现出非周期、非对称的耦合振动行为.

Fluid-induced Vibrations of Thin Elastic Plate for Different Inflow Reynolds Numbers

Measurements on vortex-induced elastic thin plate with a 3D-particle image velocimetry(3D-PIV) system and a motion tracking system(DH-5935N) are carried out for understanding the mechanism of the fluid-structure interaction.The flow field near the plate is measured with the 3D-PIV system while the motion of the elastic thin plate is measured with the motion tracking system of the accelerating sensor.In the experiments,macroscopic interprets on the fluid-structure interactions are made using three-dimensional vector fields of the flow and displacements of the elastic plate.Results of motion measures show that the fluid-induced vibration is quite significant for flow Reynolds numbers and the elastic plate shows complex non-periodic and non-symmetry coupled vibrating behavior when the complex wake interacts with the plate,simultaneously,and PIV result shows the interchange of flow patterns with the fluid-induced vibrating plate.