两个相邻冷却塔风荷载的相互作用

Interference of Wind Loading Between Two Neighboring Cooling Towers

本文通过风洞模拟的方法给出了二个固定塔距的大型双曲线型自然通(?)冷却塔在大气边界层气流中各种风向角下塔体表面的平均和脉动风压分布。文中着重讨论了两塔风荷载相互影响的动态特性。结果表明:后塔对前塔的影响较小,而前塔对后塔的风荷载影响风随向角不同大致可分为三个不同的影响区域:尾流影响、综合弱影响和邻近影响区。

In this paper the time-mean, as well as fluctuating pressure distributions,on the surfaces of two large hyperbolic natural draft cooling towers, with fixed distance, under various wind directions are given by means of wind tunnel simulation. Special attentions are given to discuss the mechanism and special features of wind loading interference between two towers. The experiments were carried out in artificial simulated atmosphere boundary layer. The results show that under various wind directions B, the interference on rear tower by the front one is much strong than that on front tower by the rear one, and three different regions can be classified. The wake effect will be dominated as the wind directions within 0°≤ 35°, and the mutual effect will be dominated as the wind directions from 75° to 90°, between these two regions is synthetic weak interference region. Because of these three different kinds of interference mechanism, the features of wind loading on rear towers are very different. Moreover, the pressure spectra analysis shows that, due to the grouping-effect, the energy may be concentrated at some frequency and the value of frequency may be changed compared with single tower.