The Wind-tunnel Test and Unsteady CFD of an Ornithopter Formation
學年 104
學期 2
發表日期 2016-02-22
作品名稱 The Wind-tunnel Test and Unsteady CFD of an Ornithopter Formation
作品名稱（其他語言）
著者 Lung-Jieh Yang
作品所屬單位
出版者
會議名稱 2nd International Conference on "Innovative Design and Development Practices in Aerospace and Automotive Engineering"(I-DAD 2016)
會議地點 Chennai, India
摘要 According to Lissaman and Shollenberger’s article published in Science in 1970, birds fly in formation to reduce the overall energy expenditure for flight. Thus, this work adopted the same principle of flight formation to ornithopters to save energy. Two experiments and one numerical simulation try are described herein. In the first experiment, a rigid frame housing three ornithopters was made and a tethered flight of it around a fixed suspension point was performed to evaluate the cruise performance of the ornithopter formation and check for energy saving by monitoring the endurance against a known reference value. In the second experiment, a jig housing three ornithopters was subject to a wind tunnel test at the Wind Engineering Center of Tamkang University. The aerodynamic force evaluation of the formation was done. From the preliminary examination, it is found that 3 m/s, 10° angle of attack was the best case for ornithopter formation subject to 14 Hz flapping to generate largest lift and thrust. In the unsteady numerical simulation using COMSOL-Multiphysics, the simple case of two-flapping wings dogging streamwisely was demonstrated. The upstream condition of 1 m/s and 20° angle of attack was formulated and the output instantaneous resultant force on the flapping wings reveal the obvious difference from the single-flapping case. When compared to the real birds flying in a formation, the energy saving of ornithopters may be further improved by replicating the dynamic adjustments of frequency, phase change, and separation among neighboring ornithopters, to obtain best energy-saving results in the future.
關鍵字 Wind tunnel;Formation flight;Ornithopter;Comsol-Multiphysics
語言 en
收錄於
會議性質 國際
校內研討會地點 無
研討會時間 20160222~20160224
通訊作者 Lung-Jieh Yang
國別 IND
公開徵稿
出版型式
出處 Prof. of IDAD 2016
相關連結

機構典藏連結 ( http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/109237 )