单管塔塔头模型风洞试验

为研究单管塔塔头关键参数变化对所受风荷载及其变化规律的影响,基于高频测力天平技术,在均匀流场中对大比例单管塔塔头模型(双轮式)进行了风洞试验。试验主要研究了塔身直径、天线尺寸、外挑距离等参数对阻力系数的影响,阻力系数在高雷诺数区间内的变化规律以及外部天线对塔头整体阻力的贡献。试验结果表明:整体模型阻力系数对雷诺数变化不敏感,阻力系数随着塔身直径的增大而减小;塔身阻力系数受风向角影响较大,其下降斜率随着塔身直径增大而增大,下降趋势逐渐趋于平缓。将外部天线所受阻力与整体模型所受阻力之比定义为天线外形影响系数,试验结果表明:天线外形影响系数随雷诺数增大而增大,在高雷诺数段趋于平稳,且随着塔身直径的增大,影响系数减小,天线对塔头整体阻力的贡献减弱;天线外形尺寸对模型阻力系数及其变化趋势影响较小;模型阻力系数随着外挑距离的增大而增大,且其随雷诺数的变化受外挑距离的影响较小。

Wind-tunnel test for head of monopole model

To study the influence of the variation of key parameters of the head of monopole (two-wheel type) on the wind load and its change law, wind-tunnel tests were carried out on large-scale models of the head of monopole in uniform flow field, based on the high-frequency force balance technology. The influence of monopole diameter, antenna size, overhang distance, and other parameters on the drag coefficient was analyzed, the variation of the drag coefficient in the range of high Reynolds number was studied, and the contribution of the external antenna to the overall resistance of the head of monopole was discussed. Results show that the drag coefficient of the integrated models was not sensitive to the variation of the Reynolds number, and it decreased as the monopole diameter increased. The drag coefficient was greatly affected by the wind direction angle, and the descending slope of the drag coefficient increased as the monopole diameter increased, while the downward trend gradually tended to be gentle. In this study, the ratio of the resistance of the external antenna to that of the integrated models was defined as the antenna shape influence coefficient. Test results show that the influence coefficient increased with the increase in the Reynolds number and tended to be stable in the range of high Reynolds number. As the monopole diameter increased, the influence coefficient decreased, and the contribution of the antenna to the integrated models was weakened. The antenna size had little effect on the drag coefficient and its variation trend. The drag coefficient increased as the overhang distance increased, and its variation with Reynolds number was less affected by the overhang distance.