中国电机工程学报Issue(19)：149-156,8.
八分裂导线阻力系数屏蔽效应风洞试验
Wind Tunnel Test on Shielding Effects on Drag Coefficient of 8-Bundled Conductors
摘要
Abstract
In order to investigate the shielding effects on drag coefficient of 8-bundled conductors, wind tunnel test on three typical rigid conductor model sections and real conductors placed horizontally with a supporting system were put forward. The factors that affect the drag coefficient, such as wind velocity, turbulence intensity, wind attack angle, and conductor diameter were studied. The results show that the drag coefficient drops obviously to a minimum value as the wind velocity increases to a relatively lower value. As the wind velocity increases to relatively higher, drag coefficient increases to a constant regardless of wind velocity. The drag coefficient in the turbulent flow is smaller than that in uniform flow and the critical wind velocity at the bottom of the curve in turbulent flow is also smaller that in uniform flow. Compared with the recommended value by the current design code, the drag coefficients for the three types of 8-bundled conductors decrease significantly under the wind velocity of 39.8m/s. The larger the diameter, the more obvious the shielding effects. The maximum reduction of drag coefficient for 8-bundled 900/40 conductor is 28.2% lower than that of the design code, which shows that the drag coefficient in the current code for large cross-sectional 8-bundled conductor is conservative. Shielding effect should be considered in calculation of wind load for large cross-sectional 8-bundled conductors.关键词
八分裂导线/阻力系数/屏蔽效应/风洞实验/刚体模型/真型导线Key words
8-bundled conductor/drag coefficient/shielding effect/wind tunnel test/rigid model/real conductor分类
信息技术与安全科学引用本文复制引用
谢强,管政..八分裂导线阻力系数屏蔽效应风洞试验[J].中国电机工程学报,2013,(19):149-156,8.基金项目
国家自然科学基金项目(50778135，51278369)；国家电网公司科技项目(SGTGYJSFW2012-368)。Project Supported by National Natural Science Foundation of China (50778135,51278369) （50778135，51278369）
R&D Program of SGCC (SGTGYJSFW2012-368) （SGTGYJSFW2012-368）
