超大型冷却塔龙卷风作用塔筒内表面风荷载特性研究  

Characteristics of wind load on inner surface of super large cooling tower under tornado action

作　　者：陈旭 黄珑霆 丁福祥 韩力 王通[1] 赵林[2] CHEN Xu;HUANG Longting;DING Fuxiang;HAN Li;WANG Tong;ZHAO Lin(School of Civil Engineering,Shanghai Normal University,Shanghai 201418,China;State Key Lab of Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,Shanghai)

机构地区：[1]上海师范大学建筑工程学院,上海201418 [2]同济大学,防灾国家重点实验室,上海200092

出　　处：《振动与冲击》2021年第21期31-38,共8页Journal of Vibration and Shock

基　　金：国家自然科学基金项目(52008247)。

摘　　要：以某规划建设的215 m超大型冷却塔为研究对象,基于龙卷风物理模拟装置开展了龙卷风作用下冷却塔刚体测压风洞试验,研究了不同龙卷风涡流比条件下塔筒内表面风压分布规律,提出了龙卷风作用塔筒内压分布数学模型。结果表明:龙卷风作用下的塔筒内压主要受龙卷气压降影响,呈均匀分布、环向强相关的负压;内压随龙卷风涡核半径内涡流比的减小以及塔心至涡心间距的减小而减小,即冷却塔位于低涡流比下的龙卷风涡核中心时所受内吸力最大,内压分布可以定量表示为冷却塔与龙卷风相对位置有关的对数模型。Taking a 215 m high super large cooling tower planned for construction as the study object,based on the physical simulation device of tornado,wind tunnel tests for cooling tower rigid body pressure measurement under the action of tornado were conducted.Distribution laws of wind pressure on inner surface of the tower under conditions of different tornado swirl ratios were studied to propose the mathematical model for tower inner pressure distribution under tornado.The results showed that the tower inner pressure under tornado is mainly affected by tornado pressure drop,it is a negative pressure with uniform distribution and strong circumferential correlation;tower inner pressure decreases with decrease in swirl ratio within tornado vortex core radius and distance between tower center and vortex center,i.e.,the inner suction of cooling tower is the maximum when the tower is located at tornado vortex core center with low swirl ratio;tower inner pressure distribution can be quantitatively expressed as a logarithmic model with respect to the relative position between cooling tower and tornado.

关 键 词：超大型冷却塔 龙卷风 内压 风洞试验 涡流比 

分 类 号：TU332[建筑科学—结构工程]