Abstract
The purpose of this research is to clarify generation mechanism of aerodynamic force of flying insects such as the dragonfly. To understand the mechanism of insect flight is important to develop Micro Air Vehicles (MAV) for rescue inquiry devices of disaster area. The aim of this investigation is a quantitative correlation analysis between vortex structure around a dragonfly and aerodynamic force. Unsteady aerodynamic force and flow field were measured by micro load-cell system and dynamic PIV system. As a result, the continuous vortex tubes were observed such as the U-shaped separation. The topology of the separated flow is almost two dimensional without near wing-tip. When the distance of vortex core was small, the large amounts of aerodynamic forces were generated. The experimental results showed strong interaction between the vortices and wings occurred when the distance of vortex core was almost same as the chord length.
