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通过风洞试验对变截面正八边形棱柱的风载特性进行研究,试验测得了Re数在3.0×106～8.9×106范围内柱体的表面平均压力及其气动力,总结了平均压力系数沿柱体轴向和周向的分布规律,以及St数随Re数和风向角的变化规律.研究结果表明:平均压力系数沿柱体周向分布变化较大,当柱体侧壁倾角超过一定值时平均压力系数沿轴向呈非均匀分布,且风向角的变化对平均压力系数的周向分布影响较大,不同风向角下St数随Re数的增加趋于稳定值.
Wind tunnel test was used to study the wind load characteristics of a regular octagonal prism. The mean pressure and the aerodynamic force of the cylinder with a Re number between 3.0 × 106 and 8.9 × 106 were obtained. The mean pressure coefficient The axial and circumferential distribution of cylinder and the variation of St number with Re number and wind direction angle.The results show that the average pressure coefficient changes greatly along the circumference of the cylinder.When the inclination angle of cylinder side wall exceeds a certain value The average pressure coefficient is unevenly distributed along the axial direction, and the change of the wind direction angle has a great influence on the circumferential distribution of the average pressure coefficient. The St numbers tend to be stable as the Re number increases under different wind direction angles.