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利用Fluent软件对超大瘦高型冷却塔的风荷载进行了CFD数值模拟,获得冷却塔外表面的三维流场特性和风压系数分布曲线,并与规范数据进行比较,以验证数值模拟的准确性;利用CFD动网格研究风振条件下冷却塔内外壁的风压分布。结果表明:考虑风振特性后,冷却塔外壁风压呈现增大的趋势,最大负压位置即流动分离点在考虑风振时产生了滞后;对于本文研究的上下开口结构而言,在考虑风振作用后内部风压系数的绝对值整体偏大,且内部高压区的位置发生了变化;不考虑风振时内部风压高压区发生在接近塔底的区域,而考虑风振特性后,内部风压高压区发生在接近塔顶的区域。这说明风振在一定程度上改变了冷却塔内部风压的分布。
Fluent software was used to simulate the wind load of the ultra-large lenght cooling tower by CFD. The three-dimensional flow field characteristics and the wind pressure coefficient distribution curve of the outer surface of the cooling tower were obtained and compared with the standard data to verify the accuracy of the numerical simulation. Study on Wind Pressure Distribution of Inner and Outer Walls of Cooling Tower under Wind Vibration Condition by Using CFD Moving Grids. The results show that the wind pressure on the outer wall of the cooling tower tends to increase with considering the wind vibration characteristics. The maximum negative pressure position, ie, the flow separation point, has a hysteresis when wind vibration is considered. For the upper and lower opening structures studied in this paper, After the vibration, the absolute value of the internal air pressure coefficient is larger and the position of the internal high-pressure zone changes. When the wind pressure is high, the internal pressure high-pressure zone occurs near the bottom of the tower. However, considering the wind-vibration characteristics, The pressure-high zone occurs near the top of the tower. This shows that wind vibration to some extent changed the distribution of wind pressure inside the cooling tower.