The Autorotation Boundary in the Flight of Samaras
The Autorotation Boundary in the Flight of Samaras
复制标题
萨马拉斯飞行中的自转边界
DOI：
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
A. Azuma
中科院分区：
文献类型：
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作者：
Kunio Yasuda;A. Azuma
摘要通过在垂直风洞中对自由下落的旋转翅果进行试验，可以精确地分析翅果的飞行特性。它们自由地悬浮在垂直喷射的气流中，并由频闪灯照亮。通过对模拟的翅果模型（由苯乙烯泡沫塑料和轻木切片制成的具有简化几何构型的薄纸形式）进行类似的试验，可以结合模型的几何构型确定重心的自转边界。模型的下降速度和自转尾旋速率等飞行特性与模型的重心位置、盘载荷或翼载荷、中弦线或弧面曲线以及前缘表面粗糙度的组合密切相关。
Abstract The flight behaviour of the samaras can be analysed precisely by performing tests on free-falling rotary samaras in a vertical wind tunnel. They are freely suspended in vertically ejected air flow and lit up by a stroboscopic lamp. By performing similar tests with simulated models of samaras (which are made of styrene foam and sliced balsa in the form of a thin paper with simplified geometrical configuration), the autorotation boundary of the center of gravity can be determined in connection with the geometrical configuration of the models. The flight characteristics such as descending speed and spinning rate of autorotation depend strongly on the combination of the location of center of gravity, the disc loading or wing loading, the curve of mean chord line or camber and the surface roughness near the leading edge of the model.