中文摘要：

针对流线型断面阻力系数测力法与测压法差异性问题，采用三维数值模拟的方法，以苏通大桥主梁断面为研究对象，研究不同宽高比和风嘴角度的主梁断面总阻力系数与压差阻力系数的变化规律，并进一步讨论摩擦阻力对总阻力贡献率的变化规律。同时，讨论雷诺数对不同工况下摩擦阻力贡献率的影响。研究结果表明：宽高比和风嘴角度变化均对流线型断面摩擦阻力贡献率的影响较显著，宽高比越大，摩擦阻力对总阻力的贡献越大，而风嘴角度越小，摩擦阻力对总阻力的贡献也越大。当来流风速为12m／s，风攻角为0。时，利用最小二乘法拟合得到了流线型断面测压法阻力系数随宽高比和风嘴角度变化的修正系数，研究结论可提高测压法阻力系数的工程应用。

英文摘要：

In view of the difference of drag force coefficient obtained by the global force measurement and pressure distribution methods, the three - dimensional numerical simulations were carried out to investigate the variations of the total drag coefficient and pressure drag force coefficient with aspect ratio and wind fairing angle by taking the Sutong Bridgeg girder section as an example. The changing rules of the contribution ratio of the friction drag to the total drag and the effect of Reynolds numbers on it were discussed. The results show that the changes of aspect ratio and wind fairing angle of streamlined section have a significant influence on the contribution rate of the friction drag. The greater aspect ratio or the smaller wind fairing angle is, the greater contribution ratio of friction drag to the total drag will be. When the wind velocity is 12 m/s and the wind attack angle is 0°, correction coefficient of the drag force coefficient obtained by pressure distribution methods for streamlined section varying with different aspect ratio and wind fairing angle was obtained by the least square method. These findings can provide a reference for its applicability in the engineering practice.