风攻角对宽高比为5的矩形断面梁气动力特性的影响

Influence of Wind Attacking Angle on Aerodynamic Characteristic of Rectangular Girder with Aspect Ratio 5

针对宽高比为5的矩形断面梁进行了节段模型测压风洞试验,研究了矩形断面梁的气动力特性随风攻角的变化规律.研究结果表明：在0°～6°的风攻角范围内,风攻角对斯托罗哈数的影响很小;不同风攻角下的驰振力系数均大于0;与上表面中间位置的测点相比,上表面边缘位置测点的压力与升力和扭矩的相关性更强;上表面边缘位置测点的压力与升力和扭矩的相关性对风攻角的变化不敏感;随着风攻角的增大,上表面中间位置测点的压力与升力和扭矩的相关性显著增强.

A pressure-measured sectional model wind tunnel test of rectangular girder with aspect ratio 5 was performed.The changing rule of aerodynamic characteristic of rectangular girder versus wind attacking angle was studied.The study results show that when wind attacking angle is in range of 0°~6°, the change of wind attac-king angle has little effect on Strouhal number.The galloping force coefficients under different wind attacking an-gles are greater than zero.Compared with point-pressure in center of upper surface, point-pressure in the edge of upper surface is more correlated with lift force and torque.With the increase of the wind attacking angle, the correlation of point-pressure in edge of upper surface with lift force and torque changes little, while correlation of point-pressure in center of upper surface with lift force and torque increases dramatically.