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在肥皂膜水洞中完成了柔性丝线在自由来流和卡门涡街中的实验,观测了丝线在两种情况下的运动,并基于实验所得的运动信息,利用二维面元法计算了丝线在两种情况下的受力情况.实验和数值模拟结果显示,丝线在卡门涡街中的运动和受力情况都与自由来流中不同.在卡门涡街中,丝线的摆动频率等于卡门涡街脱泻的频率,振幅变小,身体曲率变大.数值计算定量地证明了丝线在自由来流中受阻力作用,在卡门涡街中受推力作用.同时,还研究了卡门涡街中丝线受到的平均阻力随丝线和涡街的相对相位的变化关系。
The experiment of flexible thread in free stream and Karman vortex street was completed in the film hole of soap film. The movement of thread in two situations was observed. Based on the experimental motion information, The results of the experiment and the numerical simulation show that the movement and force of the wire in the Karman vortex are different from those in the free flow.In the Karman vortex, the frequency of the wavy wire is equal to the Karman vortex diarrhea The amplitude of the body becomes smaller and the curvature of the body becomes larger.The numerical calculation proves that the yarn is affected by the resistance in the free flow and the thrust in the Karman vortex.At the same time, The relationship between the relative phase of yarn and vortex shedding.