典型四塔组合特大型冷却塔群风荷载干扰效应

Interference Effect of Wind Loads for Super Large Cooling Tower Under Typical Four Towers Combinations

摘要:

以在建世界最高冷却塔（220 m）为工程背景，分别对单体、双塔、串列、矩形、菱形、L形和斜L型四塔组合共353个工况进行了刚体测压风洞试验.系统探讨了5种典型四塔组合方案对冷却塔群静力、动力和极值干扰效应的影响规律.采用数理统计、频谱分析等方法对干扰效应的不同影响因素和作用机理进行研究，提出了典型四塔组合考虑风向的干扰因子估算公式.从整体风荷载干扰效应角度综合定性给出四塔组合形式方案选择排序为：串列>斜L形>L形>菱形>矩形.回归分析表明，四塔组合形式的特征角度与最大干扰因子之间存在良好的线性相关性.

Abstract:

With the world’s highest cooling tower (220 m) which is being built as the engineering background, the wind tunnel tests of pressure measurement under single tower condition and six typical group towers combinations were conducted. The influence laws of static, dynamic and extreme interference effects of different typical four towers combinations were discussed. The mathematical statistics method and frequency spectrum method were used for analyzing different influencing factors and mechanisms. Then, the formulas of interference factors for typical four towers combinations considering wind directions were given. Finally, based on comprehensive assessment of the interference effects of overall wind loads, the best scheme for the arrangement of the four towers in a row was proposed, which followed the arrangements in oblique Lshaped pattern, Lshaped pattern, rhombic pattern, and rectangular pattern successively. A strong linear correlation was found to exist between the characteristic angle α and the maximum FE of five typical fourtower arrangements.