临界雷诺数区光滑圆柱振动与气动力研究
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摘要
临界雷诺数区气动力特性是影响细长圆柱结构大幅振动的重要因素之一。该文通过刚性模型测压风洞试验,对临界雷诺数区光滑圆柱动态气动力分布特性及对临界区圆柱发生大幅振动的原因进行了分析。研究结果表明:圆柱在临界雷诺数区会发生大幅振动,当振动发生时,圆柱沿展向的气动力状态有一定的差异,这种气动力状态的差异说明气动力的非定常特性是引起大幅振动的主要原因。
The aerodynamic forces on a circular cylinder in the critical Reynolds number range significantly influence its large-amplitude vibrations. The wind pressure tests are carried out in the present study to clarify the relationship between the wind pressure distribution and large-amplitude vibrations for a smooth circular cylinder in the critical Reynolds number range. The results show that the large-amplitude vibrations occur in the critical Reynolds number range. Meanwhile, the aerodynamic forces along the length of the cylinder are different when the vibrations occur. This difference implies that the unsteadiness in a flow state is the main reason of the large-amplitude vibrations of a smooth circular cylinder.
The aerodynamic forces on a circular cylinder in the critical Reynolds number range significantly influence its large-amplitude vibrations. The wind pressure tests are carried out in the present study to clarify the relationship between the wind pressure distribution and large-amplitude vibrations for a smooth circular cylinder in the critical Reynolds number range. The results show that the large-amplitude vibrations occur in the critical Reynolds number range. Meanwhile, the aerodynamic forces along the length of the cylinder are different when the vibrations occur. This difference implies that the unsteadiness in a flow state is the main reason of the large-amplitude vibrations of a smooth circular cylinder.
引文
[1]马文勇,汪冠亚,袁欣欣.圆柱结构涡激共振耦合效应及抗风设计参数研究[J].中国公路学报,2018,31(5):74―83,105.Ma Wenyong,Wang Guanya,Yuan Xinxin.Study on vortex-induced resonance coupling effect and wind-resistant design parameters of cylindrical structures[J].Chinese Journal of Highway,2018,31(5):74―83,105.(in Chinese)
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[8]Nikitas N,Macdonald J H G.Aerodynamic forcing characteristics of dry cable galloping at critical Reynolds number[J].European Journal of Mechanics-B/Fluids,2015,49:243―249.
[9]Ma W,Liu Q,Matsumoto M.Excitation of the large-amplitude vibrations of a circular cylinder under normal wind conditions in the critical Reynolds number range[J].Wind Conditions in the Critical Reynolds Number Range,2019,168:110―122.
[10]黄伯城,马文勇,赵贞欣.临界雷诺数区气动力特性研究[D].石家庄:石家庄铁道大学,2018:32―46.Huang Bocheng,Ma Wenyong,Zhao Zhenxin.Study on characteristic aerodynamics for a smooth cylinder in the critical Reynolds number range[D].Shijiazhuang:Sjiazhuang Railway University,2018:32―46.(in Chinese)
[11]Zdravkovich M M.Flow around circular cylinders.Vol 1:Fundamentals[M].London:OUO Oxford,1997:45―52.
[2]徐刚,王靖夫,任文敏.斜拉桥拉索雨风振机理探讨[J].工程力学,2004,21(3):44―48.Xu Gang,Wang Jingfu,Ren Wenmin.Discussion on wind-induced vibration mechanism of cable rain for cable-stayed bridge[J].Engineering Mechanics,2004,?àe21(3):44―48.(in Chinese)
[3]马文勇,袁欣欣.圆形断面在35 k~330 k雷诺数范围的气动力特性研究[J].工程力学,2015,32(增刊):348―352.Ma Wenyong,Yuan Xinxin.Aerodynamic characteristics of circular section in the range of 35 k~330 k Reynolds number[J].Engineering Mechanics,2015,32(Suppl):348―352.(in Chinese)
[4]Ma Wenyong,Macdonald J H G,Liu Qingkuan.Aerodynamic characteristics and excitation mechanisms of the galloping of an elliptical cylinder in the critical Reynolds number range[J].Journal of Wind Engineering&Industrial Aerodynamics,2017,171:342―352.
[5]Masaru Matsumoto,Tomomi Yagi,Hideaki Hatsuda,et al.Dry galloping characteristics and its mechanism of inclined yawed cables[J].Journal of Wind Engineering and Industrial Aerodynamics,2010,98:317―327.
[6]杜晓庆,张烨,顾明.临界雷诺数下带人工水线斜拉索气动性能研究[J].振动与冲击,2013,32(9):46―49.Du Xiaoqing,Zhang Ye,Gu Ming.Aerodynamic behavior of cable with artificial waterline at critical Reynolds number[J].Vibration and Shock,2013,32(9):46―49.(in Chinese)
[7]刘庆宽,邵奇,郑云飞.雷诺数对圆柱气动力和流场影响的试验研究[J].实验流体力学,2016,30(4):7―13.Liu Qingkuan,Shao Qi,Zheng Yunfei.Experimental study on the effect of Reynolds number on the aerodynamic force and flow field of a cylinder[J].Experimental Fluid Mechanics,2016,30(4):7―13.(in Chinese)
[8]Nikitas N,Macdonald J H G.Aerodynamic forcing characteristics of dry cable galloping at critical Reynolds number[J].European Journal of Mechanics-B/Fluids,2015,49:243―249.
[9]Ma W,Liu Q,Matsumoto M.Excitation of the large-amplitude vibrations of a circular cylinder under normal wind conditions in the critical Reynolds number range[J].Wind Conditions in the Critical Reynolds Number Range,2019,168:110―122.
[10]黄伯城,马文勇,赵贞欣.临界雷诺数区气动力特性研究[D].石家庄:石家庄铁道大学,2018:32―46.Huang Bocheng,Ma Wenyong,Zhao Zhenxin.Study on characteristic aerodynamics for a smooth cylinder in the critical Reynolds number range[D].Shijiazhuang:Sjiazhuang Railway University,2018:32―46.(in Chinese)
[11]Zdravkovich M M.Flow around circular cylinders.Vol 1:Fundamentals[M].London:OUO Oxford,1997:45―52.
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