摘要
柔性光伏支架的频率低、质量轻,极易在风荷载作用下发生大幅振动。以某实际柔性光伏项目为工程背景,借鉴桥梁抗风的研究经验,对该柔性光伏支架的颤振性能进行研究。首先,考虑严格的相似比关系,设计并制作了弹性悬挂节段模型系统,并对其动力特性进行了测试;然后,进行不同光伏组件倾角(-39°~+39°)下的弹性悬挂节段模型测振风洞试验,研究光伏组件风致响应随风速的变化规律,得到各倾角下柔性光伏节段模型的颤振临界风速值,探讨2种气动措施对提高柔性光伏支架颤振稳定性的效果。结果表明:在0°~39°的正倾角工况下,柔性光伏支架的颤振临界风速随光伏组件倾角的增大,呈现先减小后增大的趋势,最小颤振临界风速出现在12°~21°光伏组件倾角范围内,折算成实际风速为9.6m/s;在-39°~0°的负倾角工况下,颤振临界风速随光伏组件倾角的增大,也呈现先减小后增大的趋势,最小颤振临界风速出现在-21°~-12°光伏组件倾角范围内,折算成实际风速为10.1m/s;设置中央稳定板的气动措施难以有效提高柔性光伏支架的颤振临界风速。
The flexible photovoltaic supports are easy to have large vibration under wind load due to their low frequency and light weight.Taking an actual flexible photovoltaic pro-ject as the engineering background,the flutter performance of the flexible photovoltaic sup-ports is studied by referring to the research experience of bridge wind resistance.Firstly,considering the strict similarity ratio,the elastic suspension segmental model system was de-signed and manufactured,and the dynamic characteristics were tested.Then,wind tunnel tests of elastic suspension segmental models with different PV module inclinations(-39°~+39°)were carried out to study the variation of wind-induced response of PV modules with wind speed,and the flutter critical wind speed values of flexible PV segmental models at various inclinations were obtained.Finally,the effects of two aerodynamic measures on improving the flutter stability of flexible PV supports were discussed.The results show that under the working condition of 0°to 39°positive tilt angle,the flutter critical wind speed of flexible PV supports decrease first and then increase with the PV module tilt angle.The minimum flutter critical wind speed appears in the range of 12°to 21°PV module tilt angle,which is converted into the actual wind speed of 9.6m/s.Under the working condition of negative inclination angle of-39°to 0°,the flutter critical wind speed also decrease first and then increase with the the tilt angle of the PV module.The minimum flutter critical wind speed appears in the range of-21°to-12°PV module tilt angle,which is converted into the actual wind speed of 10.1m/s.It is difficult to effectively improve the flutter critical wind speed of flexible PV supports by aerodynamic measures with central stabilizer.
作者
李寿英
马杰
刘佳琪
陈政清
Li Shouying;Ma Jie;Liu Jiaqi;Chen Zhengqing(College of Civil Engineering,Hunan University,Changsha 410082,China;Hunan Provincial Key Labo-ratory of Wind Engineering and Bridge Engineering,Hunan University,Changsha 410082,China)
出处
《土木工程学报》
EI
CSCD
北大核心
2024年第2期25-34,共10页
China Civil Engineering Journal
基金
国家自然科学基金(51578234)。
关键词
柔性光伏支架
颤振
节段模型
风洞试验
临界风速
光伏组件倾角
气动措施
flexible photovoltaic supports
flutter
segmental test model
wind tunnel tests
critical wind velocity
inclined angle of photovoltaic module
aerodynamic countermeasures
作者简介
李寿英(1977—),男,博士,教授。主要从事大跨桥梁抗风、建筑结构抗风、结构减震控制方面的研究。E-mail:shyli@hnu.edu.cn;马杰(1997—),男,硕士研究生。主要从事结构抗风方面的研究。;刘佳琪(1994—),男,博士研究生。主要从事结构抗风方面的研究。;陈政清(1947—),男,博士,教授。主要从事大跨桥梁抗风、建筑结构抗风、结构减震控制方面的研究。
