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Π型断面竖向涡振过程气动力不同分量的演变特性
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Evolution Characteristics of Different Components of Aerodynamics During Vertical Vortex-induced Vibration of Π-shaped Girder
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    摘要:

    典型Π型开口断面与传统流线型箱梁相比,其截面钝化程度高,很容易发生涡振现象.本文通过同步测振测压风洞试验和计算流体动力学(CFD)相结合方法对典型开口断面表面压力分布特征和气动力不同分量、滞回特性等非线性现象展开研究.首先对涡振锁定区间内不同时期表面分布压力的演化特征进行分析,其次通过CFD动网格方法实现断面流固耦合分析.在此基础上,采用希尔伯特振动分解(HVD)方法对涡激振动过程中气动力不同分量进行分解.结果表明:开口断面上表面平均压力在前缘部分,处于负压区,气流在此发生分离,在涡振极值点时,脉动压力在0.1<X/B<0.3区域变化最为剧烈,表明旋涡脱落强度在该区域最大,并且分析发现该开口断面气动力具有明显高阶分量.由于高阶谐波分量的存在,气动力非线性程度不断加深,气动力各阶分量在整个振动周期内做功具有不同的特点.其中,气动力一阶分量F1在振动周期内,做功呈现曲回上升的形式,整体上表现为增加趋势,气动力二阶分量F2的滞回曲线呈现复杂的“8”字环形状,可以忽略三阶及以上分量对涡振系统的影响.

    Abstract:

    Compared with the traditional streamlined box girder, the typical Π-shaped open section is prone to vortex-induced vibration (VIV) because of its high section bluff configuration. In this research, the simultaneous vibration and pressure vibration of wind tunnel tests and computational fluid dynamics (CFD) are used for studying the characteristics of the pressure distribution along the surface of the typical open section and the nonlinear phenomena such as different aerodynamic components and hysteresis characteristics. First, the initial characteristics of the local pressure in different periods in the VIV lock-on region are analyzed. Secondly, the CFD dynamic grid method is used to realize the fluid-solid coupling analysis of the section. On this basis, the different frequency components of the aerodynamic forces in the VIV process are decomposed by the Hilbert vibration decomposition (HVD) method. The research results show that the average surface pressure on the leading edge of the opening section is in the negative pressure zone, where the airflow is separated. At the extreme point of the VIV, the pulsating pressure changes most violently in the area of 0.1

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MA Zhenxing, LI Jiawu?,ZHAO Guohui, WANG Feng, Hao Jianming.Π型断面竖向涡振过程气动力不同分量的演变特性[J].湖南大学学报:自然科学版,2024,(5):132~142

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  • 在线发布日期: 2024-05-30
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