Interaction of the elytra and hind wings of a rhinoceros beetle (trypoxylus dichotomus) during take-off

rhinoceros beetle;flapping wing;wing-wing interaction;insect flight;take-off mode;vortical structures;lift;circulation;621

공과대학 기계항공공학부 ;

University:서울대학교 대학원

关键词: rhinoceros beetle;    flapping wing;    wing-wing interaction;    insect flight;    take-off mode;    vortical structures;    lift;    circulation;    621;   

Others  :  http://s-space.snu.ac.kr/bitstream/10371/123892/1/000000133591.pdf

美国|英语

来源: Seoul National University Open Repository

【 摘 要 】

The elytra are a pair of hardened wings that cover the abdomen of a beetle to protect beetle’s hind wings. During take-off, these elytra open and flap in phase with the hind wings. We investigated the effect of the elytra flapping on the beetle’s aerodynamic performance. Numerical simulations are performed at Re=17,000 (based on the maximum velocity at wing tip and the mean chord length of the hind wing of a rhinoceros beetle during take-off) using an immersed boundary method. The simulations are focused on take-off, and the wing kinematics used are directly obtained from experimental observations using high speed cameras. The simulation results shows the three-dimensional vortical structures generated by the hind wing of the beetle and their interaction with the elytra. The presence of elytra has no effect on the lift generated by the hind wings, and the lift force on the elytra themselves is negligible.