工程结构雷诺数效应的研究进展

Research Progress of Reynolds Number Effect of Engineering Structures

工程结构的雷诺数效应一直是风工程界关注的重要基础问题.随着建筑高度的增加和桥梁跨径的增大,抗风研究要求更为精细化,因而在研究中考虑雷诺数效应就更显重要.为此,归纳了国内外有关圆形和矩形结构以及桥梁模型抗风研究中的雷诺数效应的基础研究成果及其工程应用成果,涉及的内容主要包括建筑物的平均风压、静三分力系数和Strouhal数的雷诺数效应;还讨论了脉动风压和脉动风力的雷诺数效应;总结了在低雷诺数风洞中模拟高雷诺数效应的措施,这些措施包括改变模型表面粗糙度和增大来流湍流度.最后,对今后的相关研究方向提出了一些建议.

The Reynolds number effect of engineering structures has always been a fundamental problem in wind engineering. With the increasing of the building height and the bridge span, the wind resistance research needs to be more precise, which makes the Reynolds number effect becoming more and more significant. This paper presents an overview of the basic research achievements and the engineering applications of circular cylinder, rectangular prism and bridge models. The related contents include the surface pressure distribution, the three component forces coefficients, the Strouhal number, the fluctutating pressure and the fluctutating wind force. Two methods of high Reynolds number effect simulation in low Reynolds-wind tunnels are summarized, for instance, changing model surface roughness and increasing the flow turbulence. Finally, some recommendations for future researches are put forward.