中文摘要：

为了研究矩形断面、倒直角断面、倒内凹圆弧断面和倒外凸圆弧断面等4种断面的单个和多个钝体存在气动干扰效应的问题，基于有限体积法和SIMPLE算法，对均匀粘性定常流体的雷诺数在亚临界区域的绕流流动进行计算流体动力学（CFD）数值模拟。计算其在不同风攻角、不同倒角尺寸和不同柱体间距情况下的三分力系数，并分析其在不同情况下的气动力系数的变化规律。结果表明：对单个钝体而言，各断面在不同风攻角情况下的阻力系数、升力系数和扭矩系数整体上依照矩形断面、倒直角断面、倒内凹圆弧断面和倒外凸圆弧断面的顺序依次减小，而倒直角断面、倒内凹圆弧断面和倒外凸圆弧断面阻力系数、升力系数和扭矩系数随着倒角尺寸的增大，呈减小的趋势；对这2个钝体而言，由于气动干扰效应，下游钝体无论是在变化趋势上还是在数值大小上和上游钝体相比都发生了较大的变化。

英文摘要：

In order to study the aerodynamic interference effect of single and multiple blunt body for rectangular section, reverse right angle section, reverse inter convex arc section and reverse outer convex arc section, based on the finite volume method and the SIMPLE algorithm, the uniform viscous and incompressible fluid around blunt bodies when Reynolds number was in the subcritieal area was simulated by computation fluid dynamics （CFD） technology. The aerodynamic coefficients under different conditions such as different wind angles of attack, different chamfer dimensions and different cylinder spacings, etc. were calculated and the change of aerodynamic coefficient was analyzed. The results show that （ 1 ） the drag and lift as well as torque coefficients of each section of single blunt body decrease in accordance with the sequence of rectangular section, reverse right angle section, reverse concave arc section and reverse convex arc section as a whole during different wind angles of attack, while the drag and lift as well as torque coefficients of reverse right angle section, reverse concave arc section and reverse convex arc section decrease successively when chamfer dimension increases; （2） the downstream blunt body produced bigger change than upstream blunt body both in variation trend and value due to aerodynamic interference effect.