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Study of random characteristics of fluctuating wind loads on ultra-large cooling towers in full construction process

机译：全过程超大型冷却塔风荷载波动随机特性研究

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This article presents a study of the largest-ever (height = 220 m) cooling tower using the large eddy simulation (LES) method. Information about fluid fields around the tower and 3D aerodynamic time history in full construction process were obtained, and the wind pressure distribution along the entire tower predicted by the developed model was compared with standard curves and measured curves to validate the effectiveness of the simulating method. Based on that, average wind pressure distribution and characteristics of fluid fields in the construction process of ultra-large cooling tower were investigated. The characteristics of fluid fields in full construction process and their working principles were investigated based on wind speeds and vorticities under different construction conditions. Then, time domain characteristics of ultra-large cooling towers in full construction process, including fluctuating wind loads, extreme wind loads, lift and drag coefficients, and relationship of measuring points, were studied and fitting formula of extreme wind load as a function of height was developed based on the nonlinear least square method. Additionally, the frequency domain characteristics of wind loads on the constructing tower, including wind pressure power spectrum at typical measuring points, lift and drag power spectrum, circumferential correlations between typical measuring points, and vertical correlations of lift coefficient and drag coefficient, were analyzed. The results revealed that the random characteristics of fluctuating wind loads, as well as corresponding extreme wind pressure and power spectra curves, varied significantly and in real time with the height of the constructing tower. This study provides references for design of wind loads during construction period of ultra-large cooling towers.
机译：本文使用大涡模拟（LES）方法对有史以来最大的冷却塔（高度= 220 m）进行了研究。获得有关塔架周围流场的信息以及整个施工过程中的3D空气动力学时间历程的信息，并将开发的模型预测的整个塔架上的风压分布与标准曲线和实测曲线进行比较，以验证该模拟方法的有效性。在此基础上，研究了超大型冷却塔施工过程中的平均风压分布和流场特性。根据不同施工条件下的风速和涡度，研究了整个施工过程中的流场特征及其工作原理。然后，研究了超大型冷却塔在整个施工过程中的时域特征，包括波动的风荷载，极限风荷载，升力和阻力系数以及测量点的关系，并根据高度对极限风荷载进行拟合公式。是基于非线性最小二乘法开发的。此外，还分析了建筑塔上风荷载的频域特征，包括典型测量点的风压功率谱，升力和阻力功率谱，典型测量点之间的周向相关性以及升力系数和阻力系数的垂直相关性。结果表明，风荷载波动的随机特征以及相应的极端风压和功率谱曲线随建筑塔的高度而实时变化。该研究为超大型冷却塔施工期间的风荷载设计提供参考。

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