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工程力学  2015 

圆形断面在35k~330k雷诺数范围的气动力特性研究

DOI: 10.6052/j.issn.1000-4750.2014.05.S022, PP. 348-352

Keywords: 圆形断面,气动力,风洞试验,雷诺数,临界区

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Abstract:

圆形断面是土木工程中最常见的断面形状之一,圆形断面的细长结构常发生风致大幅振动,雷诺数是影响该类断面结构气动力的重要参数之一。采用刚性模型测压风洞试验,通过气动力系数、风压分布、流动特征点和漩涡脱落频率的分析,给出索结构在雷诺数35k~330k范围内的气动力特点及其产生机理。与亚临界区相比,在临界雷诺数区,平均风压系数零点、最小平均风压系数点和分离点向尾流区移动,圆柱断面两侧流动状态不对称,平均阻力系数下降,出现非零的平均升力系数,规则的漩涡脱落消失。

References

[1]  Zdravkovich M M. Flow around circular cylinder [M]. New York: Oxford University Press, 1997: 19―198.
[2]  Nikitas N, Macdonald J H G, Jakobsen J B, et al. Critical Reynolds number and galloping instabilities: Experiments on circular cylinders [J]. Experiments in Fluids, 2012, 52(5): 1295―1306.
[3]  刘庆宽, 王毅, 郑云飞, 等. 水线-雷诺数效应-斜拉索振动关系的试验研究[J]. 工程力学, 2012, 29(11): 257―265. Liu Qingkuan, Wang Yi, Zheng Yunfei, et al. Experimental study on the relation of water rivulet- Reynolds number effect-cable vibrations [J]. Engineering Mechanics, 2012, 29(11): 257―265. (in Chinese)
[4]  马文勇, 顾明, 全涌, 等. 覆冰导线任意方向驰振稳定性分析方法[J]. 同济大学学报(自然科学版), 2010, 38(1): 130―134. Ma Wenyong, Gu Ming, Quan Yong, et al. Analysis method of galloping in arbitrary directions of iced conductors [J]. Journal of Tongji University (Natural Science), 2010, 38(1): 130―134. (in Chinese)
[5]  刘庆宽, 郑云飞, 马文勇, 等. 雷诺数效应对斜拉索气动特性的影响[J]. 工程力学, 2013, 30(增刊): 284―289. Liu Qingkuan, Zheng Yunfei, Ma Wenyong, et al. Reynolds number effect on aerodynamic charcteristics of stay-cables [J]. Engineering Mechanics, 2013, 30(Suppl): 284―289. (in Chinese)
[6]  Alonso G, Meseguer J, Sanz-Andrés A, et al. On the galloping instability of two-dimensional bodies having elliptical cross-sections [J]. Journal of Wind Engineering and Industrial Aerodynamics, 2010, 98(8/9): 438―448.
[7]  Macdonald J H G, Larose G L. A unified approach to aerodynamic damping and drag/lift instabilities, and its application to dry inclined cable galloping [J]. Journal of Fluid and Structures, 2006, 22(2): 229―252.
[8]  马文勇, 刘庆宽, 刘小兵, 等. 风洞试验中测压管路信号畸变及修正研究[J]. 实验流体力学, 2013, 27(4): 1―7. Ma Wenyong, Liu Qingkuan, Liu Xiaobing, et al. Study on correction and distortion effects caused by tubing systems of pressure measurements in wind tunnel [J]. Journal of Experiments in Fluid Mechanics, 2013, 27(4): 1―7. (in Chinese)
[9]  ESDU 80025. Mean forces, pressures and flow field velocities for circular cylindrical structures: Single cylinder with two-dimensional flow [R]. London, UK: Engineering Sciences Data Unit, 1980.
[10]  Nishimura H, Taniike Y. Aerodynamic characteristics of fluctuating forces on a circular cylinder [J]. Journal of Wind Engineering and Industrial Aerodynamics, 2001, 89(7/8): 713―723.
[11]  Farell C, Blessmann J. On critical flow around smooth circular cylinder [J]. Journal of Fluid Mechanics, 1983, 136: 375―391.

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