动网格模拟风振对超大瘦高型冷却塔风荷载的影响

发布时间：2018-02-16 10:22

本文关键词： 冷却塔风荷载数值模拟动网格　出处：《应用力学学报》2016年06期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:The CFD numerical simulation of wind load of super thin and high cooling tower was carried out by using Fluent software. The three-dimensional flow field characteristics and wind pressure coefficient distribution curve of the outer surface of cooling tower were obtained, and compared with the standard data to verify the accuracy of the numerical simulation. The distribution of wind pressure on the inner and outer wall of cooling tower under wind-induced vibration is studied by using CFD dynamic grid. The results show that the wind pressure on the outer wall of cooling tower increases with the consideration of wind-induced vibration, and the maximum negative pressure position, that is, the flow separation point, lags behind when considering wind-induced vibration. For the upper and lower opening structure studied in this paper, the absolute value of the internal wind pressure coefficient is larger than that of the wind vibration, and the position of the internal high pressure region has changed. When the wind vibration is not considered, the high pressure area of the inner wind pressure occurs near the bottom of the tower, but after considering the characteristics of the wind vibration, the high pressure area of the internal wind pressure occurs near the top of the tower, which indicates that the wind vibration changes the distribution of the wind pressure in the cooling tower to a certain extent.
【作者单位】：浙江大学力学系;中南电力设计院;
【分类号】：TU312.1

【相似文献】