π形山脉主山脊线风速加速效应研究  

Study on Wind Speed-up Effect on Main Ridge Line ofπ-shaped Mountain Range

作　　者：鲍旭明 楼文娟[1] 廖孙策 林晨琦 陈科技 卞荣 BAO Xuming;LOU Wenjuan;LIAO Sunce;LIN Chenqi;CHEN Keji;BIAN Rong(Institute of Structural Engineering,Zhejiang University,Hangzhou 310058,China;Research Institute of Economic Technology,Zhejiang Provincial Corporation of State Grid,Hangzhou 310008,China)

机构地区：[1]浙江大学结构工程研究所,浙江杭州310058 [2]国网浙江省电力有限公司经济技术研究院,浙江杭州310008

出　　处：《湖南大学学报（自然科学版）》2024年第1期170-179,共10页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助重点项目(51838012);国网浙江省电力有限公司科技项目(5211JY20001T)。

摘　　要：为研究真实地形的加速效应,提取真实地形的几何特征建立理想简化地形,提出一种π形山脉模型.采用CFD数值模拟研究顺子山脉风向下子山脉间距、长度及坡度对主山脊线加速效应的影响,结合地形特征比较π形山脉与三维余弦山脉的主山脊线加速比差异,在后者基础上获得π形山脉主山脊线特征点的风速加速比简化计算公式,并通过一处真实π形山脉加以验证.结果表明:π形山脉主山脊线中点的加速比受子山脉间距、长度影响较大,而山脊线交点的加速比受子山脉长度、坡度影响较大;与三维余弦山脉相比,π形山脉主山脊线加速比在山脊线端部相同,但整体偏小,尤其受子山脉遮挡的部分显著偏小,超过离地70 m高度后差异基本消失;通过与真实π形山脉的风场比较,发现简化地形和简化计算公式能较好反映真实地形主山脊线特征点的加速效应.To study the wind speed-up effect of real terrain,the geometric features of real terrain were extracted to establish an ideal simplified terrain.Then,theπ-shaped mountain range was proposed in this paper.The CFD numerical simulation was used to study the influence of the distance,length,and slope of subsidiary mountain ranges on the wind speed-up effect at the main ridge line in the wind direction along subsidiary mountain ranges.The difference in the speed-up ratio of the main ridge line between theπ-shaped mountain range and the three-dimensional cosine-shaped mountain range was compared by combining with the terrain characteristics.Based on the latter,a simplified calculation formula of the wind speed-up ratio at the feature points of the main ridge line of theπ-shaped mountain range was obtained and verified by a trueπ-shaped mountain range.The results showed that the speed-up ratio at the midpoint of the main ridge line of theπ-shaped mountain range was greatly affected by the distance and the length of the subsidiary mountain ranges,and the speed-up ratio at the intersection point of the ridge line was greatly affected by the length and slope of the subsidiary mountain ranges.Compared with the three-dimensional cosine-shaped mountain range,the speed-up ratio of the main ridge line of theπ-shaped mountain range was the same at the end of the ridge line,but it was smaller as a whole,especially the part shielded by the subsidiary mountain ranges was significantly smaller.The difference disappeared after exceeding the height of 70m above the ground.Compared with the wind field of the realπ-shaped mountain,it was found that the simplified terrain and simplified calculation formula can reflect the speed-up effect of the feature points at the main ridge line of the real terrain.

关 键 词：山脉 简化地形 加速比 计算流体力学(CFD) 数值模拟 

分 类 号：TU973.32[建筑科学—结构工程]