常规风和下击暴流作用下定日镜风压特性比较  

Comparison of wind pressure characteristics of heliostat under normal wind and downburst

作　　者：吉柏锋[1] 魏祎博 牛刚刚 赵进新 JI Baifeng;WEI Yibo;NIU Ganggang;ZHAO Jinxin(Hubei Key Laboratory of Roadway Bridge and Structure Engineering,Wuhan University of Technology,Wuhan 430070,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]武汉理工大学土木工程与建筑学院,湖北武汉430070

出　　处：《华中科技大学学报（自然科学版）》2020年第8期39-43,共5页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(51308430,51438002);国家级大学生创新创业训练计划资助项目(20191049706015)。

摘　　要：利用计算流体动力学方法对常规风和下击暴流作用下定日镜的表面风压进行数值模拟和对比分析.研究结果表明:在常规风和下击暴流作用下,定日镜在各工作仰角下的迎风面均以正压为主,在镜面上边缘存在极小范围的负压区域,背风面负压整体呈现上部小、下部大对称分布的特点.随着工作仰角的增大,在常规风和下击暴流作用下,定日镜迎风面压力峰值中心均由底部逐渐上移,峰值压力逐渐增大,当处于大工作仰角时,迎风面高压区在常规风风场中位于上部,而下击暴流风场中位于中部且高压区分布范围比常规风更大.定日镜背风面负压峰值随工作仰角增大在常规风风场中逐渐减小,而在下击暴流风场中背风面压力基本不变,当处于小工作仰角时,在常规风风场中定日镜背风面谷值压力位于上部,分布梯度明显,在下击暴流风场中背风面压力分布较均匀.The wind pressure of the heliostat under normal wind and downburst were numerical simulated and analyzed using computational fluid dynamics.The results show that,under the action of normal wind and downburst,the windward of the heliostat are all dominated by positive pressure at different working elevation angles while there are also small negative pressure area on the upper edges,and the negative pressure on the leeward are characterized by a smaller on top and larger on bottom symmetrical distribution.As the working elevation angle of the heliostat increases,the windward peak pressure of the heliostat gradually moves upward from the bottom under the action of normal wind and downburst,and the peak pressure magnitude gradually increases.At large working elevation angles,the high-pressure area on the windward appears at the upper part of the heliostat under normal wind,while under the downburst it is located at the middle and the high-pressure area is distributed more than normal wind.The peak negative pressure on the leeward of the heliostat gradually decreases with the increase of the working elevation angle under the normal wind,while it is nearly unchanged under the downburst.At small working elevation angles,the valley pressure on the leeward of the heliostat is at the upper part under normal and the distribution gradient is obvious,but under downburst,the wind pressure distribution on the leeward is relatively uniform.

关 键 词：常规风 下击暴流 定日镜 数值模拟 风压特性 

分 类 号：TU312.1[建筑科学—结构工程]