基于LES和DES的定日镜结构风致响应分析  

Wind induced response analysis of heliostat structure based on LES and DES

作　　者：卢春玲[1,2,3] 陈建通 陈锦焜 王强 LU Chunling;CHEN Jiantong;CHEN Jinkun;WANG Qiang(College of Civil and Architecture Engineering,Guilin University of Technology,Guilin 541004,China;Guangxi Key Laboratory of New Energy and Building Energy Saving,Guilin 541004,China;Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of Resources,Guilin University of Technology,Guilin 541004,China)

机构地区：[1]桂林理工大学土木与建筑工程学院,桂林541004 [2]广西建筑新能源与节能重点实验室,桂林541004 [3]桂林理工大学有色金属矿产勘查与资源高效利用协同创新中心,桂林541004

出　　处：《振动与冲击》2022年第11期298-306,共9页Journal of Vibration and Shock

基　　金：国家自然科学基金项目(51568015);广西创新驱动发展专项(桂科AA20302006);广西建筑新能源与节能重点实验室基金项目(22-J-21-10)。

摘　　要：定日镜作为典型的风敏感结构,设计中必须考虑其动力特性和风致响应。选用大涡模拟(large eddy simulation,LES)和分离涡模拟(detached eddy simulation,DES),结合一种新的湍流脉动流场产生方法(discretizing and synthesizing random flow generation,DSRFG)模拟风场的湍流边界条件,计算得到了0°风向角下0°、30°、60°镜面仰角下定日镜的流场分布和风荷载时程数据。建立了定日镜整体结构的有限元模型,进行了定日镜整体结构在不同镜面仰角下的风致响应分析。结果表明,通过与风洞试验结果对比,LES和DES能较好地预测出顺风向等效风荷载,但LES的结果更接近试验值;随着仰角增大,定日镜下部的共振峰值能量逐渐减小,上部的共振峰值能量逐渐增大;定日镜下部的最不利工况为仰角0°时,风振系数为3.1,中上部的最不利工况发生在仰角为60°时,风振系数分别为2.0、3.4;LES和DES能较好地模拟出流场中的紊流与涡旋,且随着仰角增大,尾流区变得狭长。结合风洞试验,为定日镜以及相似结构的数值模拟以及抗风设计提供了参考。As a typical wind sensitive structure,dynamic characteristics and wind-induced responses of heliostat must be considered in design.Here,the large eddy simulation(LES)and the detached eddy simulation(DES)were used to simulate turbulent boundary conditions of wind field by combining a new turbulent fluctuating flow field generation method called discretizing and synthesizing random flow generation(DSRFG).Flow field distribution and wind load time history data of heliostat at 0°,30°and 60°mirror elevations were calculated.The finite element model of the whole structure of heliostat was established to analyze its wind-induced responses under different mirror elevations.The results showed that compared with wind tunnel test results,LES and DES can better predict equivalent wind load along wind direction,but the results of LES are closer to test values;with increase in elevation,resonance peak energy of heliostat lower part decreases gradually,and resonance peak energy of heliostat upper part increases gradually;wind vibration coefficient is 3.1 when the most unfavorable working condition of heliostat lower part is elevation 0°,and most unfavorable working conditions of heliostat middle and upper parts occur when elevation is 60°,and their wind-induced vibration coefficients are 2.0 and 3.4,respectively;LES and DES can better simulate turbulence and vortex in flow field,and the wake area becomes narrow and long with increase in elevation;combined with wind tunnel tests,the study results can provide a reference for numerical simulation and anti-wind design of heliostat and similar structures.

关 键 词：定日镜 大涡模拟(LES) 分离涡模拟(DES) 风荷载 风致响应 

分 类 号：TK513.1[动力工程及工程热物理—热能工程]