【摘要】 以圆柱和方柱组合柱体为研究对象，采用二维非稳态RANS数值模拟方法，研究了4种组合柱体在不同攻角下的气动特性和流动特性。研究结果表明：各柱体均有驰振现象发生，1C柱体驰振响应明显低于其他柱体。各柱体在所有攻角下，Strouhal数呈现先上升后降低的趋势，最后趋于平稳；在所研究的各柱体中，1C柱体的气动特性最优，8C柱体气动特性最差；对各柱体的流动模式进行了分析，在5°风向角附近时，各柱体主要为主分离流动模式，在20°～45°之间流动模式由单一次级涡向合并涡转变。更多还原

【Abstract】 The cir-squa prism is taken as research object. The two-dimensional unsteady RANS numerical method is used to study the aerodynamic and flow characteristics of four combined cylinders at different angles of attact. The result of research shows that the galloping phenomenon of each cylinder occurred, and the galloping response of 1C cylinder significantly lower than that of other cylinder. At all angles of attack of each cylinder, the Strouhal number shows a trend of increase firstly, then decrease, and become constant at last. Among the each cylinders of studied, the aerodynamic of the 1C cylinder is the best, and that of the 8C cylinder is the woest. The flow pattern of each cylinder is analyzed. The each cylinders is mainly the main separation flow pattern with 5° wind attack angle. The flow pattern transfers from single secondary vortex to vortex merging with 20° and 45° wind attack angle.更多还原