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采用两种粗糙条数量和五种粗糙条厚度分析模型表面粗糙度对冷却塔风荷载的影响,应用本征正交分解法(POD)进行风压点的加密和重构,分析不同粗糙度下冷却塔的风压分布和总体受力,并将试验结果与规范、以往的实测和风洞试验结果进行比较。研究发现:冷却塔模型的表面越光滑,喉部附近B层测点最大负风压的绝对值越大;当模型表面粗糙条数量增大时,冷却塔的底部剪力系数变大,受到的总体风阻力越大;冷却塔颈部附近的阻力系数与规范数据接近,而顶部和中下部的阻力系数比规范大,需引起设计的重视。
The effect of surface roughness on the wind load of the cooling tower is analyzed by two kinds of roughness numbers and five kinds of roughness thickness. The eigen-orthogonal decomposition method (POD) is used to encrypt and reconstruct wind pressure points. Wind tower pressure distribution and overall force, and the test results and specifications, the previous test and wind tunnel test results were compared. It is found that the smoother the surface of the cooling tower model, the greater the absolute value of the maximum negative air pressure at the point B in the vicinity of the throat. When the number of the surface roughness increases, the shear coefficient at the bottom of the cooling tower becomes larger. The overall wind resistance is greater; the drag coefficient near the neck of the cooling tower is close to the standard data, and the drag coefficient of the top and middle lower than the standard is large, which needs to be paid attention to in design.