Experiments on Free-to-Pivot Hover Motions of Multi-hinged Flat Plates
Experiments on Free-to-Pivot Hover Motions of Multi-hinged Flat Plates
复制标题
多铰平板自由枢转悬停运动实验
DOI：
--
复制
发表时间：
2011
期刊：
影响因子：
--
通讯作者：
L. Bernal
中科院分区：
文献类型：
--
作者：
Kenneth Granlund;M. Ol;L. Bernal
我们最近的工作进行平板的前缘，铰链在前缘和自由枢轴之间的45°角限制器，几个参数的研究。第一个考虑展弦比的影响，发现展弦比影响流场的历史，但不影响气动力的历史（推力产生或阻力）。第二个考虑了前缘加速度的各种占空比，发现在气动力历史上没有可辨别的加速度效应，特别是在板达到其极限冲角后没有记忆效应。第三项研究比较了前缘铰接的单元件板和双元件板，后者具有沿展向沿着中弦延伸的第二个铰链。后者是结构柔性效应初步研究的替代。双元件板产生的推力和阻力都较小，因此在大多数情况下，除了非常小的冲程弦比之外，其品质因数略低于可比的单元件板。
We extend recent work on flat plates undergoing imposed translation of their leading edge, hinged at the leading edge and free to pivot between 45° angle limiters, to several parameter studies. The first considers aspect ratio effects, with the finding that aspect ratio affects flowfield history but not aerodynamic force history (thrust production or resistive force). The second considers various duty cycles of imposed leading edge acceleration, with the finding that there is not a discernable acceleration effect on aerodynamic force history, and in particular no memory-effects after the plate has attained its limiting incidence angle. The third study compares single-element plates hinged at the leading edge, with double element plates, the latter having a second hinge running spanwise along the midchord. The latter is a surrogate for preliminary study of structural flexibility effects. Double-element plates produce both less thrust and have less resistive force, resulting in most cases in slightly lower figure of merit than that of comparable single-element plates, except for very small stroke to chord ratios.