H型截面吊杆气动性能的风洞试验

通过节段的静力和弹簧悬挂动力试验,对H型吊杆的驰振和涡激振动性能进行分析。不做任何措施的H型吊杆在一定的风速下很容易发生驰振。腹板开孔的H型吊杆在横桥向来流时表现出涡激振动,开孔越大,涡激振动的振幅越小,方形孔比圆形孔要小,表明腹板开孔可以抑制该风向的涡激振动。在接近顺桥向来流的作用下,实腹和只在腹板开孔的吊杆在风速不高时表现为弛振。在翼板上加风嘴时,没有发现驰振,但横桥向来流时的涡激振动有较大增加。翼板上开孔能提高吊杆顺桥向来流的驰振临界风速,甚至杜绝该方向驰振的发生,且开孔越大效果越好。

Wind Tunnel Experiment on the Aerodynamic Performances of H-shaped Booms

On the basis of static aerodynamic force tests and dynamic response tests, the galloping and (vortex-induced) oscillation performances of H-shaped booms were investigated. The tests results indicate that (H-shaped) booms without taking any measures have galloping performance in low speed wind. H-shaped booms with holes in web have vortex-induced oscillate performance when the wind from landscape orientation. The (amplitude) of vortex-induced oscillation with square pomes in web is smaller than round ones and is decreasing with the size of hole increasing, which indicate amplitude of vortex-induced oscillation can be decreased by (putting) poles in ventral-board when the wind from landscape orientation, but galloping still happen. Installing fairing on wing, there was no galloping happened, but the amplitude of vortex-induced oscillation increases a lot. By way of putting holes in wing, the galloping critical velocity of can be enhanced. The poles are much (bigger) the effects are much better. It even can prevent galloping from happening.