倒品字形分布三个冷却塔的风致干扰效应研究  

Study of wind-induced interference effects on three adjacent cooling towers under upside-down triangular distribution

作　　者：沈国辉[1] 余关鹏 孙炳楠[1] 楼文娟[1] 李庆祥[3] 杨仕超[3] 

机构地区：[1]浙江大学土木工程学系,浙江杭州310058 [2]中国联合工程公司,浙江杭州310022 [3]广东省建筑科学研究院,广东广州510500

出　　处：《空气动力学学报》2011年第1期107-113,共7页Acta Aerodynamica Sinica

基　　金：国家自然科学基金资助项目(50608063)

摘　　要：针对呈倒品字形分布的三个冷却塔,采用风洞试验方法进行风致干扰效应研究。通过增加模型表面粗糙度的方法来补偿模型试验的雷诺数,应用POD方法进行风压点的加密和插值,计算单塔和三塔的阻力系数、升力系数和底部剪力系数等,并分析三塔的干扰系数随塔间距、风向角的变化规律。研究表明,三塔情况下,顺风向底部剪力平均值和极大值的干扰系数大部分都小于1,说明呈倒品字形分布的三塔对风通道形成阻挡,使后塔受到的总体阻力变小。横风向底部剪力极大值的干扰系数大部分超过1,最大值接近2,说明三塔情况下横风向的脉动效应非常显著。Wind tunnel tests were employed to study wind-induced interference effects on three adjacent cooling towers under upside-down triangular distribution.The technique of adding roughness on model surface was applied to compensate for the Reynolds number effect due to model tests.Then the POD method was used to interpolate the wind pressures on the towers.After that,drag coefficients,lift coefficients and base shear coefficients on the isolated tower and three adjacent towers were calculated.Based on these coefficients,interference factors with respect to tower-to-tower distances and wind azimuths were analyzed.Results from this study show that the interference factors of both the mean and maximum base shear in along-wind direction under three towers condition are mostly less than 1.This indicates that the three towers arranged in upside-down triangle generally form a blockage against the passing of the wind,resulting in a reduction of total resistance on the latter tower.Most of the interference factors of maximum base shear in crosswind direction is larger than 1 with the biggest value close to 2,indicating that the fluctuating effects in crosswind direction under three towers condition are significant.

关 键 词：冷却塔 风荷载 风洞试验 干扰效应 本征正交分解法 

分 类 号：V211.3[航空宇航科学与技术—航空宇航推进理论与工程]