单塔和双塔情况下大型冷却塔的表面风压研究  

Wind pressure on large cooling towers under condition of isolated tower and adjacent two towers

作　　者：沈国辉[1] 鲍侃袁[2] 孙炳楠[1,3] 李庆祥[4] 

机构地区：[1]浙江大学土木工程学系,浙江杭州310058 [2]浙江大学建筑设计研究院,浙江杭州310027 [3]浙江大学宁波理工学院,浙江宁波315100 [4]广东省建筑科学研究院,广东广州510500

出　　处：《华中科技大学学报（自然科学版）》2011年第7期104-108,共5页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(50608063)

摘　　要：针对大型冷却塔在单塔和双塔情况下的表面风压分布,应用风洞试验方法进行研究,采用增加模型表面粗糙度的方法来补偿模型试验的雷诺数效应,通过与以往成果的比较以确定合理的粗糙度,进行变风向角和塔间距工况的双塔干扰试验.研究表明:模型表面粗糙度对冷却塔外表面风压系数有较大影响;双塔串列时前塔对后塔的影响远大于后塔对前塔的影响;斜列时可根据前塔对后塔的干扰程度并按风向角划分为3个区域.同时给出典型塔间距下考虑风向角因素的后塔体型系数包络线,供设计参考.The distribution of wind pressure on large hyperbolic cooling towers under the condition of isolated tower/adjacent two towers were studied by wind tunnel tests. The technique of adding roughness on model surface was applied to compensate for the Reynolds number effect due to model tests. The proper roughness element was determined by comparing the test results with those done by previous researches. Wind tunnel tests of the adjacent two towers with respect to tower distance and wind azimuth were also carried out. Results show that the roughness elements on the tower model would influence the wind pressures of the cooling tower greatly. When the two towers are in tandem arrangement, the front tower has significant aerodynamic impacts on the rear tower, whereas the rear tower has insignificant effects on the front tower. When the two towers are in staggered arrangement, the interference effects of the front tower to the rear tower can be categorized into three types with respect to wind azimuth. The envelope of the body shape coefficients without regard to wind azimuths on the rear tower under typical tower distance were suggested, which is helpful to the designs.

关 键 词：冷却塔 风荷载 干扰效应 风压系数 粗糙度 

分 类 号：TU312.1[建筑科学—结构工程]