下击暴流冲击作用下定日镜风环境数值模拟  

Numerical simulation of heliostat wind environment under the impact of downburst

作　　者：吉柏锋[1] 赵进新 姜峰 Ji Baifeng;Zhao Jinxin;Jiang Feng(Hubei Key Laboratory of Roadway Bridge and Structure Engineering,Wuhan University of Technology,Wuhan 430070,China;School of Civil Engineering,Sun Yat-Sen University,Guangzhou 510275,China;School of Civil Engineering and Architecture,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]武汉理工大学道路桥梁与结构工程湖北省重点实验室,湖北武汉430070 [2]中山大学土木工程学院,广东广州510275 [3]武汉理工大学土木工程与建筑学院,湖北武汉430070

出　　处：《可再生能源》2022年第4期455-462,共8页Renewable Energy Resources

基　　金：国家自然科学基金项目(51308430);湖北省自然科学基金项目(2020CFB524);道路桥梁与结构工程湖北省重点实验室(武汉理工大学)开放课题基金资助项目(DQJJ201907)。

摘　　要：为研究下击暴流冲击作用下定日镜周围的风环境时变特性,文章利用计算流体动力学方法,对处于下击暴流瞬态风场中的定日镜风环境进行数值模拟与分析。结果表明:在下击暴流冲击过程中,定日镜周围环境风速呈现出先增大后减小的趋势,当下击暴流发展到最大强度时达到风速峰值,且风速峰值和谷值区域的范围随着下击暴流的演变先增大后减小;随定日镜俯仰角增大,风速峰值无明显变化,但周围环境风速的峰值和谷值区域范围明显增大,定日镜背后涡的影响范围也逐渐增大;俯仰角对定日镜周围绕流风场的时变特征影响较大。当定日镜处于小俯仰角时,定日镜后方涡的影响范围未发生显著变化,风环境相对稳定;当俯仰角增大,随着下击暴流冲击过程的演变定日镜背后涡数量由一个增加至两个,影响范围先增大后减小,周围环境风场的复杂性提高。当定日镜处于小俯仰角时,镜面上方的高流速区域范围可忽略不计,而下方的狭缝高流速区域范围很大,威胁程度高。In order to study the time-varying characteristics of the wind environment around the heliostat under the impact of the downburst,the Computational Fluid Dynamics method was used to numerically simulate and analyze the wind environment of the heliostat in the downburst transient wind field.The research results show that:When heliostat is impacted by downburst,the wind velocity around the heliostat increases and then decreases,and reaches the peak value when the downburst reaches its maximum intensity.With the evolution of downburst,the area of peak region and valley area increases at first,reaches the maximum value when downburst develops to the maximum intensity,and then begins to decrease;With the increase of the pitch angle of the heliostat,the peak wind velocity does not change obviously,but the area of the surrounding peak and valley increases obviously,and the scale of horizontal eddy current and vertical eddy current increases gradually;The pitch angle has a great influence on the time-varying characteristics of the wind field around the heliostat.When the heliostat is at a small pitch angle,the vertical vortex behind the heliostat always has only one with the evolution of the impact process,and its scale and streamline density do not change significantly,the wind environment is relatively stable;when the pitch angle increases,with the evolution of the impact process,the number of vertical vortex increases from one to two,the scale and streamline density first increase and then decrease,and interacts with the horizontal vortex,the complexity of the surrounding wind field increases.When the heliostat is at a small pitch angle,the area of the high velocity area above the mirror is negligible,while the area of the slit below is very large and the threat is high.

关 键 词：下击暴流 定日镜 计算流体动力学 数值模拟 瞬态风场 

分 类 号：TK513.1[动力工程及工程热物理—热能工程] TU312[建筑科学—结构工程]