摘要
冷却塔群塔为常见的群体建筑物组合形式,存在复杂的塔群干扰效应。传统的群塔干扰效应研究通常面向塔筒等效静风荷载,忽略了群塔组合对于脉动风压分布模式干扰效应的量化研究。为了研究群塔组合条件下脉动风压的干扰分布模式,选取具备多种气动干扰特点的八塔组合矩形布置方案为研究对象,对群塔进行刚性模型同步测压风洞试验,获取了不同风向角条件下塔筒表面的脉动风压分布。在"迎风来流"、"侧风来流"和"背风来流"等三种典型来流模式下,结合风向角的变化将脉动风压分布形式总结为"V"型、"M"型、半"V"型+半"M"型三类,探讨了干扰影响脉动风压分布的机理,发现可将脉动荷载的干扰效应分为"弱干扰"、"非对称强干扰"和"对称强干扰"三种类别;在量化表达脉动风压干扰分布方面提出了脉动风压分布的九项式拟合公式,并按照三类分布模式给出了脉动风压的推荐表达式。
As a typical building combination form,the grouped cooling towers can have a complicated grouped-tower interference effect.Traditional studies on the grouped-tower interference effect usually emphasized the equivalent static wind load of the tower tubes,while ignored the quantitative analysis on the fluctuating wind pressure distribution patterns.In order to quantify the distribution patterns of the fluctuating wind pressure under the condition of grouped-tower combination,a rectangular arrangement of eight towers with various aerodynamic interference characteristics was selected as the research object.A rigid model synchronizing pressure measurement for the grouped cooling towers was used in the wind tunnel test,and the fluctuating wind pressure on the tower surface at different wind direction angles was obtained.Based on three typical inflow modes,i.e.,"windward flow","crosswind flow"and"leeward flow",the fluctuating wind pressure distribution can be categorized into a"V"type,a"M"type,and a half"V"+half"M"type.The interference mechanism for the fluctuating pressure distribution was explored,and it is found that the interference effect from the fluctuating wind load can be summarized as three types:"weak interference","asymmetric strong interference"and"symmetric strong interference".A 9-term fitting formula for the fluctuating wind pressure was proposed,and recommended expressions were given according for the three distribution patterns of the fluctuating wind pressure.
作者
赵林
陈翰林
钱永丰
李敬生
葛耀君
ZHAO Lin;CHEN Hanlin;QIAN Yongfeng;LI Jingsheng;GE Yaojun(State Key Laboratory of Disaster Reduction in Civil Engineering,Tongji University,Shanghai 20009,China;Key Laboratory of Wind Resistant Technology for Bridges,Ministry of Transport,Tongji University,Shanghai 200092,China;Central-Southern Safety&Environment Technology Institute Co.Ltd,Wuhan 430070,China;Northeast Electric Power Design Institute Co.Ltd,China Power Engineering Consulting Group,Changchun 130021,China)
出处
《空气动力学学报》
CSCD
北大核心
2021年第3期33-43,I0001,共12页
Acta Aerodynamica Sinica
基金
国家重点研发计划(2018YFC0809600,2018YFC0809604)
国家自然科学基金(51678451)。
关键词
冷却塔
群塔组合
干扰效应
脉动风荷载
分布模式
cooling towers
grouped-tower arrangement
interference effect
fluctuating wind load
distribution pattern
作者简介
赵林(1974−),教授,博导,主要从事桥梁与结构风工程研究.E-mail:zhaolin@tongji.edu.cn;通信作者:陈翰林(1994−),硕士,从事桥梁与结构风工程研究.E-mail:2545960181@qq.com。
