移动型下击暴流风场及其对多层建筑表面风压影响的研究  

Study on moving downburst and its influence on the surface wind pressure of multi-storey buildings

作　　者：王辉[1] 吴学健 吴安超 吴亚雄 WANG Hui;WU Xuejian;WU Anchao;WU Yaxiong(College of Civil Engineering,Hefei University of Technology,230009 Hefei,China)

机构地区：[1]合肥工业大学土木与水利工程学院,合肥230009

出　　处：《应用力学学报》2025年第2期465-472,共8页Chinese Journal of Applied Mechanics

基　　金：亚热带建筑科学国家重点实验室开放课题资助项目(No.2020ZB24);安徽省自然科学基金资助项目(No.11040606M116);教育部留学回国人员科研启动基金资助项目(教外司留[2011]1568号)。

摘　　要：下击暴流常呈现风暴的整体移动特点,其风场特征与静止型下击暴流存在显著差异。通过建立移动冲击射流数值模型,以下击暴流水平移动速度为关键变量,对移动型下击暴流非稳态风场特征及其作用下的多层建筑风压特性开展研究。结果表明:射流中心的移动导致风暴中心与射流中心产生偏移,风暴前缘形成弓形极值风速区域,且移动速度越大,偏移距离越大,弓形区域径向宽度越小,当α=0.3时,偏移距离达到0.7 D_(jet),径向宽度减小至1.5 D_(jet);下击暴流在靠近、通过和远离建筑时,建筑表面风压具有明显的时变性;风暴移速的不同导致风场结构出现显著差异,进而对多层建筑表面风压的分布产生影响,不同移速的下击暴流作用下建筑相同位置处风压系数差值最大达到1.304。The actual downburst is often accompanied with overall movement,and its wind field characteristics are significantly different from the static downburst.The numerical model of moving impinging jet has been established to study the unsteady wind field characteristics of moving downburst and the wind pressure characteristics of multi-storey buildings,while horizontal moving speed of downburst is taken as the key variable.The results show that the movement of the jet center leads to the deviation between storm center and jet center,and an extreme wind speed area of the bow-shaped distribution is formed at the front of the storm.The offset distance increases and the radial width of the bow region decreases with the increase of moving speed.Moreover,for α=0.3,the offset distance reaches up to 0.7 D_(jet),and the radial width reduces to about 1.5 D_(jet).When the storm passes by,the wind pressure characteristics change dramatically with time.Different moving speeds lead to differences in the wind field structure,which affects the distribution of wind pressure characteristics.The wind pressure coefficient can differ by up to 1.304 at the same position on the building under different moving speeds.

关 键 词：下击暴流 移动速度 风场特性 风压 数值模拟 

分 类 号：TU312.1[建筑科学—结构工程] V211.3[航空宇航科学与技术—航空宇航推进理论与工程]