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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。
In order to study the aerodynamic interference effects of single and multiple bluff bodies on four kinds of cross sections such as rectangular section, inverted square section, inverted concave section and inverted convex section, the finite volume method and SIMPLE algorithm are used to study the uniformity Computational Fluid Dynamics (CFD) Numerical Simulation of Flow Around the Reynolds Number of Viscous Conventional Fluid in a Subcritical Region. The third part force coefficient under different wind attack angles, different chamfer sizes and different cylinder spacing is calculated, and the change rule of the aerodynamic coefficient under different conditions is analyzed. The results show that for a single bluff body, the drag coefficient, lift coefficient and torque coefficient of each section under different angles of wind attack are generally in accordance with the rectangular section, the inverted square section, the inverted concave circular section and the inverted convex convex arc The order of the cross section decreases, and the drag coefficient, the lift coefficient and the torque coefficient of the cross section, the inverted concave section and the inverted convex section decrease with the increase of the chamfer size; In the case of two bluff bodies, the downstream bluff body undergoes a large change both in the trend of change and in the magnitude of the value as compared with the upstream bluff body due to the aerodynamic interference effect.