Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : March 14, 2016 - March 15, 2016
Dragonfly wing is passively deformed in the tip side from the nodus in flapping flight. Wing deformation is thought to correspond to feathering motion. However, dragonfly perform a feathering motion actively. In this study, the effect of passive deformation of the wing on aerodynamic force in flapping flight with feathering motions was investigated using fluid-structure interaction analysis. In this analysis, nodus wing models, which can deform passively, and rigid wing model, which cannot deform, are used. Feathering angle is three types: 0, 20, 40 deg. As a result, when the feathering angle is 20 deg or less, the nodus wings reduce drag force by deformation of wing during downstroke. However, when the feathering angle is 20 deg or more, overlarge deformation of wing decreases lift force. Therefore, the wing with the appropriate level of flexibility can reduce drag force without wasting energy of feathering motion.
