小型昆虫に倣った一対の羽ばたき翼の動特性に関する基礎研究

Some small insects can fly by using a pair of flapping wing. These flight performance is much higher than that of any existing artificial small flying objects like so-called drones which have rotary wings. Therefore, it is believed that using a pair of flapping wing following small insects makes flight performance of artificial small flying objects higher. In this report, we performed the numerical simulation of flow around flapping rectangular wing model treated as an immersed solid. We used the software “ANSYS CFX” for thermo-fluid analyses which using finite volume method. The knowledge learned from calculation results are as below. The generated forces (lift and thrust) on the wing model indicates the tendency that both positive and negative peak value increased with increasing the flapping frequency. The flapping frequency has no influence on the waveform of time variation of lift and thrust. If the wing model is down stroke, lift shows positive value and thrust shows negative value. If the wing model is up stroke, lift shows negative value and thrust shows positive value. The mounting angle of wing model has an influence on the thrust when it is less than 30°.