高层建筑风荷载减阻的吹气方法数值研究  

Numerical investigation of wind-load reduction for a high-rise building by blowing control

作　　者：郑朝荣[1] 张耀春[1] 

机构地区：[1]哈尔滨工业大学土木工程学院,黑龙江哈尔滨150090

出　　处：《建筑结构学报》2010年第S2期176-181,共6页Journal of Building Structures

基　　金：国家自然科学基金重大项目(59895410)

摘　　要：建筑结构的风致阻力主要来源于流动的分离,采用数值方法研究了吹气孔位置、吹气角、开孔宽度和吹气流量系数等参数对高层建筑风荷载减阻性能的影响及对分离的控制。结果表明:吹气角、开孔宽度和吹气流量系数对阻力折减系数CDR的影响显著,当吹气角大于120°时,CDR随吹气流量系数的增加先增大后减小。分析了吹气减阻的控制机理,得到了与吸气控制主要依赖于吸气流量系数不同的结论,即影响吹气控制减阻效果的直接因素是顺风向吹气动量系数Cmo。最后,拟合了风压折减系数关于Cmo的经验公式,为高层建筑吹气控制的实际应用提供参考。As the wind-induced drag of a building is mainly generated by the flow separation,effects of the influence parameters of blowing control,such as the slot position,blowing angle,slot size and flux coefficient,on performance of the wind-load reduction and the separation control for a high-rise building are analyzed through numerical simulations.It shows that the coefficient of drag reduction(CDR) is greatly changed when blowing control has different parameters listed above.When the blowing angle is larger than 120°,the CDR increases firstly and decreases afterwards as the flux coefficient is increased.Mechanism of the drag reduction is discussed,and it is found that the direct reason to bring different CDR is the along-wind coefficient of blowing momentum(Cmo),which is different from the suction control whose CDR is mainly determined by the flux coefficient.Lastly,the formulae between the coefficients of pressure reduction and the Cmo are regressed to be referred to for practical application.

关 键 词：高层建筑 吹气控制 风荷载减阻 数值模拟 风压折减系数 

分 类 号：TU973.213[建筑科学—结构工程]