This paper presents a study on aerodynamic properties of the upper segment of a high-voltage delta-configuration (cat-head) lattice transmission tower. These segments have been damaged in recent strong-wind events. A representative 1:100 scale specimen of the segment was subjected to wind tunnel tests. A computational fluid dynamics-based model was developed to simulate experimental observations. These models were extended to consider segments with different properties, and force coefficients in transverse and longitudinal directions were calculated. Further, provisions outlined in five design standards were used to estimate force coefficients for these segments. Wind forces for a segment can be determined by multiplying that computed using ASCE 74 or IEC 60826 by a factor, which is a function of yaw angle and solidity ratio. This factor varies between 1.0 and 1.6 (1.0 and 2.0) for the transverse (longitudinal) direction. Additional analyses revealed that an approximately 100% increase in the gap between adjacent longitudinal faces leads to an approximately 10% increase in the force coefficient, and that the influence of Reynolds number and turbulence parameters is small. Further, introduction of cross-arm led to a less than 10% reduction in the force coefficient for transverse direction; the influence was negligible in the longitudinal direction.

本文介绍了对高压三角形结构（猫头）格子输电塔上段空气动力学特性的研究。这些路段在最近的强风事件中遭到破坏。该段的代表性 1:100 比例样本进行了风洞测试。开发了基于计算流体动力学的模型来模拟实验观察。这些模型被扩展到考虑具有不同特性的节段，并计算横向和纵向的力系数。此外，使用五个设计标准中概述的规定来估计这些段的力系数。可以通过将使用 ASCE 74 或 IEC 60826 计算得出的数值乘以一个因子来确定分段的风力，该因子是偏航角和密度比的函数。对于横向（纵向）方向，该系数在 1.0 和 1.6（1.0 和 2.0）之间变化。其他分析表明，相邻纵向面之间的间隙增加约 100% 会导致力系数增加约 10%，并且雷诺数和湍流参数的影响很小。此外，横臂的引入导致横向力系数降低不到 10%；纵向的影响可以忽略不计。并且雷诺数和湍流参数的影响很小。此外，横臂的引入导致横向力系数降低不到 10%；纵向的影响可以忽略不计。并且雷诺数和湍流参数的影响很小。此外，横臂的引入导致横向力系数降低不到 10%；纵向的影响可以忽略不计。