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采用数值模拟方法计算了不同雷诺数苏通桥流线型断面三分力系数,通过风洞试验研究了宽高比为10∶1的流线型桥梁断面的雷诺数效应,分析了雷诺数对阻力系数、表面压力系数、风压功率谱及斯特罗哈数的影响,研究了粗糙度对雷诺数效应的抑制作用。分析结果表明:阻力系数随雷诺数的增大而减小,雷诺数会改变表面压力系数0值出现的位置,斯特罗哈数对雷诺数有平台区存在,低雷诺数风洞试验测得的斯特罗哈数比实桥值小20%,因此,流线型桥梁断面存在明显的雷诺数效应,且粗糙度对雷诺数效应有抑制作用。
The three-component force coefficient of streamlined section with different Reynolds numbers was calculated by numerical simulation. The Reynolds number effect of streamlined bridge section with aspect ratio of 10: 1 was studied by wind tunnel test. The effects of Reynolds number on the drag coefficient, Pressure coefficient, wind pressure power spectrum and Strobot number, the effect of roughness on the Reynolds number effect was studied. The results show that the drag coefficient decreases with the increase of Reynolds number, the Reynolds number changes the position where the surface pressure coefficient 0 appears, and the Strobo number exists in the plateau region with Reynolds number. The Strobel number is 20% less than the real bridge value. Therefore, there is a significant Reynolds number effect on the streamlined bridge cross section, and the roughness has an inhibitory effect on the Reynolds number effect.