Autorotating flat-plate wings: the effect of the moment of inertia, geometry and Reynolds number
Autorotating flat-plate wings: the effect of the moment of inertia, geometry and Reynolds number
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DOI：
10.1017/s0022112079000641
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发表时间：
1979-05
影响因子：
3.7
通讯作者：
J. Iversen
中科院分区：
文献类型：
--
作者：
J. Iversen
对先前研究者关于平板自转现象的自由飞行和风洞测量进行了分析。将自转特性随雷诺数以及平板的展弦比、厚度比和惯性矩的变化进行了关联。先前一项研究中对雷诺数作用的解释被证明是不正确的。在所研究的无量纲参数范围内，叶尖速比被证明仅是平板展弦比、厚度比的函数，如果惯性矩足够小，它也是惯性矩的函数。升力系数和阻力系数，以及因此的自由飞行下滑角，被证明是叶尖速比、展弦比以及基于弦长和平板厚度的雷诺数的函数。
Free-flight and wind-tunnel measurements by previous investigators of the flat-plate autorotation phenomenon have been analysed. The variation of the autorotation characteristics with changes in the Reynolds number and the aspect ratio, thickness ratio and moment of inertia of the flat plate have been correlated. The interpretation of the role of the Reynolds number made in a previous investigation is shown to be incorrect. The tip-speed ratio, for the ranges of the dimensionless parameters investigated, is shown to be a function of only the plate aspect ratio, thickness ratio, and also the moment of inertia if the latter is sufficiently small. The lift and drag coefficients, and therefore the free-flight glide angle, are shown to be functions of the tip-speed ratio, the aspect ratio and the Reynolds numbers based on the chord and plate thickness.