大型双曲冷却塔内表面风荷载的数值模拟

沈国辉¹, 张陈胜², 孙炳楠¹, 楼文娟¹

1.浙江大学土木工程学系;2.中国汉嘉设计集团



摘要:

为了获得大型冷却塔的内表面风压,应用CFD数值模拟方法进行计算,分别采用可实现的k-ε湍流模型和多相流模型计算由外风场作用和冷热空气自循环系统产生的内压,并分析这2种内压沿高度和纬度的分布规律,进行2种内压的合成计算,最后给出冷却塔内压的建议值.计算结果表明:外风场作用产生的内压随高度和纬度变化明显,自循环系统产生的内压沿着纬度几乎不变.当外风场风速较小时,自循环系统产生的内压在合成内压中占一定的比例,当外风场风速较大时,自循环系统产生的内压可以忽略.

关键词:  冷却塔  风荷载  数值模拟  内压  多相流

DOI：10.11918/j.issn.0367-6234.2011.04.021

分类号:

基金项目:国家自然科学基金资助项目(50608063)



Numerical simulation of wind load on inner surface of large hyperbolic cooling tower

SHEN Guo-hui¹, ZHANG Chen-sheng², SUN Bing-nan¹, LOU Wen-juan¹

1.Department of Civil Engineering,Zhejiang University,310027 Hangzhou,China;2.Hanjia Design Group of China,310005 Hangzhou,China

Abstract:

The computational fluid dynamics(CFD) methodology is employed to obtain the wind pressures on the inner surface of large hyperbolic cooling towers.The wind pressures on the inner surface of cooling tower,which are induced by the action of outer wind field and self-circulating system due to air temperature difference,are calculated numerically with the k-ε turbulence model and multiphase model,respectively.The distributions of these two parts of wind pressure with respect to height and latitude are then investigated.The resultant wind pressures on inner surface on cooling tower are obtained and their suggestive values are given.Results from this study show that the wind pressures on inner surface induced by the action of outer wind field vary significantly with heights and latitudes,whereas those induced by self-circulating system keep almost unchanged with respect to latitude.If the velocity of outer wind field is small,the wind pressure on inner surface induced by self-circulating system will occupy a certain proportion of the resultant wind pressures,while if the velocity is large,it can be neglected.

Key words:  cooling tower  wind load  numerical simulation  inner wind pressure  multiphase flow