斜拉索绕流场的被动流动控制研究

发布时间：2018-01-27 03:27

本文关键词： 斜拉索风致振动圆柱绕流场被动控制 PIV技术　出处：《哈尔滨工业大学》2014年硕士论文　论文类型：学位论文

【摘要】：斜拉索风致振动是桥梁工程界最关心的问题之一。斜拉索的风致振动是由尾流的非定常旋涡脱落引起的，为了控制斜拉索的非定常绕流，本文提出了三种流动控制方法：开槽圆柱控制、自吸气自吹气套环控制和螺旋形套环控制。本文基于PIV技术，在风洞中进行斜拉索节段模型的绕流场流动控制试验，分别探索这三种控制方法的流场控制效果以及影响参数。首先，研究无控斜拉索模型绕流场特征，包括时均流线、速度和湍动能；同时提出采用旋涡强度来衡量绕流场中旋涡的强度和输运特征。第二，研究开槽斜拉索模型的绕流场结构，分析开槽控制的机理，研究不同的开槽方式对控制效果的影响。第三，在斜拉索模型表面安装自吸气自吹气套环对斜拉索模型进行流场控制，，研究不同的套环间距对模型绕流场控制效果的影响。最后，提出一种螺旋形套环对斜拉索模型绕流场进行控制，并研究了套环高度和间距对控制效果的影响。
[Abstract]:The wind-induced vibration of stay cables is one of the most concerned problems in bridge engineering. The wind-induced vibration of stay cables is caused by the unsteady vortex shedding of wake flow in order to control the unsteady flow around the cable. In this paper, three flow control methods are proposed: slotted cylinder control, self-suction self-blowing ring control and spiral ring control. Based on the PIV technique, the flow field control experiment of the cable segment model is carried out in wind tunnel, and the flow field control effect and the influence parameters of the three control methods are explored respectively. Firstly, the characteristics of the flow field around the uncontrolled cable model, including the time-averaged streamlines, velocity and turbulent kinetic energy, are studied, and the vortex strength is proposed to measure the intensity and transport characteristics of the vortices in the flow field. Secondly, the flow field structure of the slotted cable model is studied, the mechanism of slotted control is analyzed, and the influence of different grooving modes on the control effect is studied. Thirdly, the flow field of the cable model is controlled by self-inspiratory self-blowing ring on the surface of the cable model, and the influence of different spacing between the rings on the flow field around the model is studied. Finally, a spiral ring is proposed to control the flow field around the cable-stayed model, and the influence of the height and spacing of the ring on the control effect is studied.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.27;U441.3

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