3941 羽ばたき翼によって発生する非定常流体力の計測(G05-5 生物流体,G05 流体工学)  [in Japanese] 3941 Measurement of unsteady aerodynamic force generated by flapping airfoils  [in Japanese]

The purpose of this research is to clarify the generation mechanism of aerodynamic lifting force of a flying insect. For this purpose, aerodynamic force and flow field were measured with a micro load-cell system and dynamic PIV system. As a result, negative pressure caused by leading-edge vortices makes large lifting-force in the downstroke process. Although the leading-edge vortices can be observed even in the case of upstroke process, lifting-force was not generated. Because of the distance between the vorticity core and wing was larger than that of the downstroke process. Therefore, the distance between the core and wing plays an important role with aerodynamic force generation.