概化峡谷地形风场特性风洞试验  

Experiment of Wind Field Characteristics of the Generalized Canyon Topography by Wind Tunnel Test

作　　者：姚德贵 王津宇 王超 李哲 张帅领 牛华伟[3] YAO De-gui;WANG Jin-yu;WANG Chao;LI Zhe;ZHANG Shuai-ling;NIU Hua-wei(State Grid Henan Electric Power Company Electric Power Science Research Institute,Zhengzhou 450052,China;Power China Henan Electric Power Survey&Design Institute Corporation Limited,Zhengzhou 450007,China;Wind Engineering Research Center,Hunan University,Changsha 410082,China)

机构地区：[1]国网河南省电力公司电力科学研究院,郑州450052 [2]中国电建集团河南省电力勘测设计院有限公司,郑州450007 [3]湖南大学风工程试验研究中心,长沙410082

出　　处：《科学技术与工程》2024年第21期9111-9119,共9页Science Technology and Engineering

基　　金：国网河南省电力公司科技项目(521702230000Q)。

摘　　要：为研究峡谷地形的风场特性,首先对比了4类规范对峡谷地形风压或风速修正的规定;其次,以V形对称坡度概化峡谷地形为研究对象,通过风洞试验,研究了其横断面方向和沿峡谷走向地形风速分布规律,并讨论了风向角对于峡谷地形风速分布的影响。结果表明:国外规范对峡谷地形风速修正规定较少,国内规范规定的峡谷风速修正系数在1.07~1.22;0°风向角下,风速地形修正系数沿峡谷中轴线基本对称;在测试高度范围内,沿峡谷走向加速区逐渐缩小,减速区逐渐变大,风速地形修正系数极大值逐渐减小,其极值均出现在“H1ZX”横断面,数值分别为1.345和0.456;0°和15°风向角下,沿峡谷走向,风速地形修正系数分别呈“旋涡状”和“山丘状”,减速区位置也不相同;谷底位置处的风速加速效应很有限,仅在峡谷风速入口位置附近存在加速效应,且风速修正系数值最大值小于规范规定最大值(1.22)。In order to study the wind field characteristics of canyon topography,firstly,the wind pressure or wind speed correction about the canyon topography in the four standards were compared.Secondly,taking a generalized canyon topography with a V-shaped symmetrical slope as the research object,the wind speed distribution law of the canyon topography s cross section direction and along the canyon strike were investigated through wind tunnel test,and the impact of wind direction on the canyon topography s wind speed distribution was also discussed.The findings demonstrate that there are few laws governing the correction of wind speed in canyon abroad,where the correction coefficient is set from 1.07 to 1.22 in Chinese standards.The wind speed correction coefficients are essentially symmetrical along the center axis of the canyon topography at 0°wind direction.Within the range of the test height,the acceleration area along the canyon is gradually narrowed,the deceleration area is gradually enlarged,and the maximum value of the wind speed correction coefficients are gradually reduced,and the extreme values all appear in the“H1ZX”cross section,with the values are 1.345 and 0.456 respectively.At the wind direction of 0°and 15°,along the canyon,the wind speed correction coefficients are seemed as“vortex”and“hill”,respectively,and the location of deceleration area is different.At the bottom of the canyon,the wind speed acceleration impact is very limited,which only occurs close to the wind inlet location of the canyon,and the highest wind speed correction coefficient is less than 1.22 that value set in Chinese standards.

关 键 词：概化峡谷地形 修正系数 风场特性 风洞试验 

分 类 号：TU973.32[建筑科学—结构工程]