钢管输电塔平均风荷载数值模拟

Numerical Simulation of Mean Wind Load Applied on Pipe Transmission Towers

基于fluent6.2软件平台,利用RNGk-ε湍流模型,对猫头形钢管塔的平均风荷载进行数值模拟,考虑风向角的变化,每隔15°模拟一次,得到了输电塔各风向角的平均风压系数,并进行了分析。结果表明:风压系数随风向角变化而变化,当风向垂直于导线平面方向时,塔头的平均风压明显小于风向平行导线平面方向时的平均风压,塔身平均风压则随风向变化不大,塔头、塔身各风向的扭矩均较小。阻力系数CD的最不利风向角为15°,Cx,Cy的最不利风向角分别为15°和75°,扭矩系数CT的最不利风向角为30°。

Based on fluent 6.2 soft platform with RNG k-ε sturbulence mode, considering the varying of wind attack angle every 15° ,mean wind pressure coefficients of a cat-head-shaped pipe transmission tower for different wind attack angles were obtained by numerical simulation. The results were also analyzed. It was shown that the mean wind pressure coefficients vary with the wind attack angle, the pressure coefficient of tower head perpendicular to the transmission line plane is much smaller than the one parallel to the transmission line plane, mean wind pressure coefficients of tower body vary slightly, and the torsions of different wind directions are very small. The most unfavorable attack angle of drag coefficient C0, Cx, Cyare 15°, 15°, 75° respectively and the one of torsional coefficient is 30°.