Experimental Investigation of Pairs of Vortex Filaments in Ground Effect
Experimental Investigation of Pairs of Vortex Filaments in Ground Effect
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DOI：
10.2514/1.32584
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发表时间：
2006-06
影响因子：
2.2
通讯作者：
L. K. Kliment;K. Rokhsaz
中科院分区：
文献类型：
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作者：
L. K. Kliment;K. Rokhsaz
利用水洞研究了地面效应中同向旋转细丝的运动.使用两个平叶片产生涡流，并使用分离板模拟地面。在几个下游位置记录了涡流运动的时间历程。给出了两个地平面位置的数据，并与自由流中的旋涡进行了比较。并利用势流模型对实验数据进行了验证.结果表明，由于地面效应的影响，涡发生了反弹。由于潜在的流动效应，涡流也经历横向运动。一个蛙跳的行为是目前由于在横向运动的差异所造成的地面接近的螺旋涡。此外，细丝形成平面波并沿沿着优选方向移动。B =叶片后缘处的涡展C =弦最大值最小值I I =涡位置的主二阶矩N =涡总数Re =涡雷诺数Re/S =展V =自由流速度z
The motion of co -rotating filaments in ground effect is investigated using a water tunnel. The vortices are generated using two flat blades and the ground is modeled with a splitter plate. The time history of the vortex motion is recorded at several downstream locations. Data is shown for two ground plane positions and compared with the vortex be havior in the free stream. The experimental data is also verified using a potential -flow model. Results show that the vortices undergo a rebound as the result of ground effect. The vortices also undergo a lateral motion due to potential flow effects. A leapfrogging behavior is present due to the differences in the lateral motions caused by the ground proximities of the spiraling vortices. In addition, the filaments form planar waves and move along preferred directions. b = vortex span at the trailing edge of the blades C = chord max min , I I = principal second moments of vortex position N = total number of vortices Re � = vortex Reynolds number = � / � S = span � V = free stream velocity z