摘要
滑雪跳台与桥梁结构类似,风障也可以为跳台滑雪运动创造一个低速的比赛风环境。采用数值模拟的方法,研究了风障透风率对滑雪跳台挡风效果的影响,系统分析了涡旋结构、无量纲风速、风环境影响系数和湍流度随风障透风率的变化特性。结果表明:侧风作用下,风障的存在明显改变了滑雪道上空的风场结构,但同时在运动员跳跃高度处会产生较大的竖向风速分量,显著干扰比赛的公正性;滑雪道上空的风环境影响系数随风障透风率的增加呈减小后增大的趋势,其中透风率为10%~20%时风障挡风效果最优,其挡风效率高达79%~97%,同时也可以有效降低运动员跳跃高度处的竖向风速分量,但风场的湍流度会明显增大;考虑滑雪跳台主体结构对风荷载的作用较不敏感,应优选设置10%~20%透风率的风障。
Since the snowboarding platform is similar to the bridge structure,windbreaks can also make a competition wind environment with low wind speed for the ski jump.The effect of the windbreak porosities on the windproof performance is analyzed by means of numerical calculation.The paper systemically analyzes the laws of vortex structure,dimensionless velocity,influence coefficient of wind environment and turbulence intensity varying with windbreak porosity.The results show that the windbreak can improve the wind field structure on the ski slope effectively,but it can also cause significant vertical velocity component on the jumping height of athlete,which will affect the fairness of the competition.The influence coefficient of wind environment over the ski slope first decrease and then increase with the increase of the porosity of windbreak.Windbreaks with the porosities of 10%~20%have the best effect on preventing crosswind,their windproof efficiency are about 79%~97%,which can also effectively reduce the vertical velocity component on the jumping height of athlete.However,the turbulence intensity will be increased significantly at the same time.The windbreaks with the porosities of 10%~20%are preferred considering that the snowboarding platform is insensitive to the effect of wind loads.
作者
黄方方
贾娅娅
刘庆宽
刘念
HUANG Fang-fang;JIA Ya-ya;LIU Qing-kuan;LIU Nian(School Of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang,Hebei 050043,China;State Key Laboratory of Mechanical Behavior and System of Traffic Engineering Structures,Shijiazhuang Tiedao University,Shijiazhuang,Hebei 050043,China;Innovation Center for Wind Engineering and Wind Energy Technology of Hebei Province,Shijiazhuang,Hebei 050043,China)
出处
《工程力学》
EI
CSCD
北大核心
2023年第S01期74-80,共7页
Engineering Mechanics
基金
河北省自然科学基金项目(E2021210110)
国家自然科学基金项目(52208495)
河北省高端人才项目(冀办[2019]63号)
科技冬奥专项项目(21475402D)。
关键词
滑雪跳台
风环境
风障
透风率
侧风
数值模拟
snowboarding platform
wind environment
windbreak
porosity
crosswind
numerical simulation
