摘要
常规低雷诺数风洞试验得到的试验结果可能因为结构存在雷诺数效应产生误差,风洞试验时,紊流风特性参数的不当模拟可能导致这种误差进一步增大.本文在风洞中采用格栅紊流,分别形成了紊流强度相同但积分尺度不同与积分尺度相同但紊流强度不同的几种局部紊流风场,以此来研究矩形结构表面风压雷诺数效应,以及紊流强度与积分尺度对表面风压雷诺数效应的影响.结果表明:平均风压与脉动风压雷诺数效应在迎风面最小,背风面最大,侧风面次之.积分尺度与紊流强度增大会导致雷诺数效应敏感区域的平均风压数值变化幅度进一步增大.积分尺度对脉动风压雷诺数效应的影响较平均风压小,尤其在背风面.紊流强度对脉动风压雷诺数效应影响很小.
The experimental results obtained from the conventional low Reynolds number wind tunnel test may name errors due to the Reynolds number effect.And the improper simulation of turbulent wind parameters may lead to further increase of the error in the wind tunnel test.By using grille turbulence in the wind tunnel,a serial of local turbulent wind fields were formed with the same turbulence intensity but different integral scale and with the same turbulence integral scale but different intensity.This paper examined the Reynolds number effect for the surface wind pressure of rectangular structure and the effect of turbulence intensity and integral scale on the Reynolds number effect for the surface wind pressure.The results showed that the Reynolds number effect of the mean wind pressure and the fluctuating wind pressure was the lowest in the windward side,the maximum in the leeward side and the second in the crosswind.The increase of the turbulence integral scale and intensity would lead to the further increase of the mean wind pressure’s rangeability in the sensitive region of the Reynolds number effect.The influence of the integral scale on the Reynolds number effect of the fluctuating wind pressure wass smaller than that of the mean wind pressure,especially on the leeward side.And the turbulence intensity had little effect on the Reynolds number effect.The fluctuating wind pressure on the structure surface was mainly dependent on the turbulence intensity of the inflow,which was independent of the scale of the model.
作者
白桦
郭聪敏
刘健新
BAI Hua;GUO Congmin;LIU Jianxin(Research Center of Highway Large Structure Engineering on Safety,School of Highway,Chang'an University,Xi′an 710064,China)
出处
《郑州大学学报（工学版）》
CAS
北大核心
2018年第2期73-79,共7页
Journal of Zhengzhou University（Engineering Science）
基金
中国博士后科学基金资助项目(2014M560737)
中国博士后科学基金特别资助项目(2016T90876)
桥梁结构抗风技术交通行业重点实验室开放基金资助(KLWRTBMC10-01)
关键词
土木工程
风洞试验
雷诺数效应
紊流积分尺度
紊流强度
civil engineering
wind tunnel test
Reynolds number effect
turbulence integral scale
turbulence intensity
作者简介
白桦（1979-），男，甘肃西和人，长安大学高级工程师，博士后，长安大学公路学院，从事桥梁抗风研究，Email:baihua9810@163.com.
