高阶模态涡振锁定区间气动力展向相关性研究  

Experimental study of spanwise correlation of vortex shedding lift forces of sectional models undergoing different modes of vibration

作　　者：华旭刚[1] 李龙龙 陈政清[1,2] 温青 HUA Xugang;LI Longlong;CHEN Zhengqing;WEN Qing(Key Laboratory of Wind and Bridge Engineering,Hunan University,Changsha 410082,China;Key Laboratory of Building Safety and Energy Efficiency,Ministry of Education,Hunan University,Changsha 410082,China;College of Civil Engineering,Hunan University of Science and Technology,Changsha 411021,China)

机构地区：[1]湖南大学风工程与桥梁工程湖南省重点实验室,湖南长沙410082 [2]湖南大学建筑安全与节能教育部重点实验室,湖南长沙410082 [3]湖南科技大学土木工程学院,湖南湘潭411021

出　　处：《铁道科学与工程学报》2020年第6期1436-1445,共10页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(51422806,51278189)。

摘　　要：由于涡激力沿展向并不完全相关,在均匀流条件下基于宽高比为5:1的矩形截面多点弹性支撑气弹模型,开展风洞试验,对气弹模型在高阶模态振动状态下以及静止状态下的涡激力展向相关性进行研究。研究结果表明:气弹模型的各竖弯模态均出现了频率相同的2个涡振区间,第1涡振区间的表观St数为0.22,第2涡振区间的表观St数为0.11;高阶模态振动状态下,不同模态的第1个涡振锁定区间内升力展向相关系数最大值位于涡振幅值最大处,而第2个涡振锁定区间内升力展向相关系数最大为位于涡振锁定区间的上升段而非涡振幅值的最大处,且与节段模型的升力变化规律相似;静止状态下气弹模型的升力展向相关性系数随着风速(雷诺数)的增加而表现出升高的趋势,且随展向间距增加而逐渐趋于0。Vortex-induced forces are not completely correlated along the spanwise direction.Based on a rectangular cross-section multi-point elastically supported aeroelastic model with a width-to-height ratio of 5:1 under uniform flow conditions,wind tunnel tests was carried out to study the spanwise correlation of the aeroelastic model under high-order mode vibration and static state.The results show that in the vertical bending modes of the aeroelastic model,two vortex intervals with the same frequency appear,the apparent St number of the first vortex interval is 0.22,and the apparent St number of the second vortex interval is 0.11;in the high-order mode vibration state,the maximum value of the lift spanwise correlation coefficient in the first vortex-locking interval of different modes is at the maximum of the vortex-induced vibration amplitude.The maximum value of the lift-off correlation coefficient in the second vortex-locking interval is located at the rising portion of the vortex-locking interval rather than the maximum value of the vortex-induced vibration amplitude,and is similar to the lift variation law of the sectional model.The lift spanwise correlation coefficient of the aeroelastic model in static state shows an increasing trend with the increase of wind speed(Reynolds number),and gradually tends to 0 with the increase of span.

关 键 词：多点弹性支撑气弹模型 高阶模态涡振 展向相关性 风洞试验 

分 类 号：TH212[机械工程—机械制造及自动化] TH213.3