摘要
利用热线风速仪对两种极端桥梁断面的尾迹区的脉动风风速进行了测量,以模型高度为特征尺寸换算得到Strouhal数,并利用天平测得模型的三分力系数.以此为基础,分析了以梁高为特征尺寸的雷诺数与上述参数的关系.试验结果表明,在以П形梁为代表的钝体桥梁断面中雷诺数效应很小,可以忽略不计;在以南京二桥为代表的流线形断面的雷诺数效应不可以忽略,同时,试验表明传统的低雷诺数风洞试验给出的三分力系数结果偏于保守.
The characteristics of Reynolds number vs Strouhal number,the drag coefficient CD,the lift coefficient CL and the moment coefficient CM have been investigated experimentally on the basis of three-component-forces measurements and of the hot-wire velocity-fluctuations measurement in the models wake Deck height of the model is set as characeristic size The Reynolds number effect of blunt bridge section (as the П-shaped bridge section) is so slight that the effect can be ignored,while for the streamline bridge section as the model 1 in this paper,the Reynolds effects are greatThe results obtained from low Reynoldswind tunnel testing and applied in the bridge design appear conservative.
出处
《郑州大学学报（工学版）》
CAS
2003年第2期22-25,共4页
Journal of Zhengzhou University（Engineering Science）
基金
国家自然科学基金资助项目(59895410)
