| Citation: | LIU Jiajia, ZHENG Mengzong, PAN Tianyu, et al. Numerical study on intermittent flapping flight performance of dragonfly during climbing[J]. Journal of Beijing University of Aeronautics and Astronautics, 2017, 43(10): 2118-2126. doi: 10.13700/j.bh.1001-5965.2016.0766(in Chinese)
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Aerodynamic force generation in a dragonfly intermittent flapping flight with modeled wings was studied using the method of numerical simulation. The computational results show that the average lift coefficient and average thrust coefficient of the modeled wing decrease with the increase of the intermittent proportion at the Reynolds number of 157. They descend faster in the frontal part, while gently in the middle part, and decrease to zero in the latter part. The average thrust coefficient is affected greater than the average lift coefficient. When the continuous flight turns into intermittent flight, the thrust coefficient during the early phase and stable phase of short gliding is significantly weakened with totally 42.7%; For the lift coefficient, it is mainly weakened during the stable phase of short gliding, accounting for 41.4%, but the early phase of short gliding has a contribution of 8% to the increase of average lift coefficient. Intermittent flapping flight is possible to improve the lift-thrust ratio in dragonfly flight. When the the proportion of gliding time to intermittent flight cycle is 0.3, the average lift-thrust ratio is close to 1.
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