中文摘要：

在风中的连接枝条的单个叶的变丑和颤动试验性地被调查。结果证明雷纳兹数字基于风速度和一些叶片是空气动力学的问题的一个关键参数。以防面对风的前面表面并且随雷纳兹的增加，数字，叶经验静电干扰变丑，大振幅和低频率摇晃，重构到三角洲翅膀形状，尖端的 flapping ，整个叶片的高频率颤动，三角洲翅膀形状的恢复，并且枝条叶联合颤动。另外一个的来自一个状态的突然的变化发生在批评雷纳兹数字。以防面对风，大振幅和低频率摇摆的背表面不发生，恢复三角洲翅膀形状被圆锥形的形状代替，并且颤动的批评雷纳兹数字比相应于有面对风的前面表面的案例的高。一双公羊角旋涡在三角洲翅膀后面被观察塑造的叶。一个单个旋涡圆锥形的塑造的叶被发现下游。一部电梯被旋涡导致，并且这部电梯帮助长叶调整位置和姿势，稳定片失真并且减少拖并且颤动。

英文摘要：

Deformation and vibration of twig-connected sin- gle leaf in wind is investigated experimentally. Results show that the Reynolds number based on wind speed and length of leaf blade is a key parameter to the aerodynamic prob- lem. In case the front surface facing the wind and with an in- crease of Reynolds number, the leaf experiences static defor- mation, large amplitude and low frequency sway, reconfigu- ration to delta wing shape, flapping of tips, high frequency vibration of whole leaf blade, recovery of delta wing shape, and twig-leaf coupling vibration. Abrupt changes from one state to another occur at critical Reynolds numbers. In case the back surface facing the wind, the large amplitude and low frequency sway does not occur, the recovered delta wing shape is replaced by a conic shape, and the critical Reynolds numbers of vibrations are higher than the ones correspond- ing to the case with the front surface facing the wind. A pair of ram-horn vortex is observed behind the delta wing shaped leaf. A single vortex is found downstream of the conic shaped leaf. A lift is induced by the vortex, and this lift helps leaf to adjust position and posture, stabilize blade distortion and reduce drag and vibration.