多分裂导线整体阻力系数风洞试验研究  

Wind Tunnel Test on Global Drag Coefficients of Multi-Bundled Conductors

作　　者：谢强[1] 孙启刚[1] 管政[2] 

机构地区：[1]同济大学土木工程学院,上海市杨浦区200092 [2]安徽省电力设计院,安徽省合肥市230601

出　　处：《电网技术》2013年第4期1106-1112,共7页Power System Technology

基　　金：国家自然科学基金项目(50778135;51278369);国家电网公司科技项目(SGTGYJSFW2012-368)~~

摘　　要：为研究多分裂导线的整体阻力系数随迎风角度、导线直径、风速、紊流度、分裂数等的变化,设计了3种典型导线的4、6、8分裂真型与模型导线试验,在风洞中测量了各分裂数和各型号导线在不同迎风角度和风速下的整体阻力系数。试验结果表明:同一种导线,均匀流场中整体阻力系数随分裂数的增加而减小;随着迎风角度的变化,整体阻力系数产生明显变化,但存在一个使得整体阻力系数总体上最大的迎风角度;同一分裂数,多分裂导线的整体阻力系数随导线截面的增大而降低;在设计风速及以上,大截面多分裂导线的整体阻力系数明显小于现行设计规范中的取值,建议规范考虑大截面多分裂导线的遮挡效应。To investigate global drag coefficients of large cross-sectional multi-bundled conductors varying with wind attack angles, conductor diameter, wind velocity, turbulence intensity and number of bundled conductors, three kinds of typical model test and real conductor test of 4-, 6-, and 8-bundled conductor are designed, and global drag coefficients of different types of conductors with different bundled numbers under different wind attack angles and wind velocities are measured in the wind tunnel. Test results show that in uniform flow the global drag coefficient of the same type of conductor decreases with the increase of bundled number; the global drag coefficient obvious changes with the variation of wind attack angle, however, as a whole, there is such a wind attack angle that makes the global drag coefficient the biggest; under the same bundled number the global drag coefficient of multi-bundled conductors decreases with the increase of cross section area of conductor; at the designed wind velocity or at that above the designed value, the global drag coefficient of multi-bundled conductors with large cross section area is obviously smaller than that adopted in current design code, thus it is recommended to take the shielding effect into consideration for the design of wind load of multi-bundled conductors with large cross section area.

关 键 词：多分裂导线 整体阻力系数 风洞实验 迎风角度 风速 

分 类 号：TM726[电气工程—电力系统及自动化]