开孔结构内压脉动影响因子的试验研究  

Experimental investigation on influence factors for internal pressure fluctuation of opening structure

作　　者：徐海巍[1] 余世策[1] 楼文娟[1] 

机构地区：[1]浙江大学建筑工程学院,浙江杭州310058

出　　处：《浙江大学学报（工学版）》2014年第3期487-491,560,共6页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(50908208)

摘　　要：为了准确描述开孔结构内压脉动响应过程,将不同内压脉动预测公式进行比较,对不同开孔尺寸和内部容积模型进行风洞试验,研究了湍流度、来流风速和开孔位置对开孔结构内压脉动响应的影响,并探讨不同预测公式的适用性.研究结果表明:开孔迎风时内压脉动较大,而斜风向下内外压脉动均方根比达到最大;孔口处湍流强度对内压脉动影响显著,而风速对内压均方根影响并不显著;迎风墙面中心开孔相比偏心开孔具有更大的内压均值和均方根.In order to accurately describe the internal pressure fluctuation in an opening structure,different empirical expressions for prediction of internal pressure were reviewed and compared.Wind tunnel tests were applied to models with different opening sizes and internal volumes to investigate the influence factors of fluctuating internal pressure including：turbulence intensity,wind velocity in approaching flow as well as opening location,and the applicability of different prediction equations were also discussed.The results show that the windward opening under normal onset flow can cause strong fluctuating internal pressure, while the maxima root mean square（RMS）ratio of internal to external pressure appears at oblique wind angle.Turbulence intensity at opening location has significant impact on the fluctuation of internal pressure.However,the effect of wind velocity on the RMS of internal pressure is insignificant.Central opening in windward wall results in bigger average and RMS values of internal pressure than those off-center wall openings.

关 键 词：开孔结构 内压 赫姆霍茨效应 内外压均方根比 

分 类 号：TU311.3[建筑科学—结构工程]