大自然界的各種飛行生物，昆蟲、鳥類、哺乳類等，均選擇了撲翼的方式來飛行，這些飛行生物為了產生更大的推進力量與更好的操控性，共同特點是具有低雷諾數、高的表面積/體積比以及飛行動作複雜，而撲翼飛行比起傳統固定翼飛行更能適合這種飛行方式。本研究的主旨在於深入瞭解蝴蝶之飛行動作，歸納蝴蝶在不同飛行模式下的撲翼動作，對自然飛行(free flight)作更深入的分析，希望可以證實創新的升力/推進力理論。歸納出撲翼攻角(angle of attack)、撲翼頻率(wing beat frequency)、撲翼幅度(wing beat amplitude)等相關參數與升力及推進力之間的關係，同時也探討其動作與飛行操控性之關係，分析蝴蝶飛行動作以及飛行時產生的流場。透過仿生拍撲機構的實驗，進一步討論展弦比(aspect ratio)、雷諾數(Re)、史卓赫數(St)、尾凸(tail)、翼縫(wing gap)對於飛行的影響，得到往復雷諾數與轉動雷諾數有正比的關係，展弦比對轉動雷諾數沒有太大影響；史卓赫數接近最佳效率時均為小展弦比，證實小展弦比的蝴蝶適合拍撲飛行，大展弦比的蝴蝶適合滑翔；發現蝴蝶在飛行時也使用間隙效應的高升力機制，利用自行設計的機構加以驗證；在翼片加入尾突結構會使轉動雷諾數增大，原因為尾突可以影響翼片所打出的渦流環中心射流的角度，增加有效推進力。

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