An Experimental Study on the Lift and Thrust Generation of a Dragonfly-type Model

Kim, Song-Hak; Chang, Jo-Won

Journal of the Korea Institute of Military Science and Technology 2006;9(4):120-127.

Song-Hak Kim, Jo-Won Chang

¹
²

잠자리유형 모델의 추력 및 양력생성에 관한 실험적 연구

김송학, 장조원

¹한국항공대학교 항공우주 및 기계공학과
²한국항공대학교 항공운항학과

Abstract

An experimental study was carried out in order to investigate the effects on the fore- and hind-wings of a dragonfly-type model. A model with two pairs of wing was developed to measure the lift and thrust of a dragonfly-type model. The fore-wing and hind-wing had incidences angle of $0^{circ};and;10^{circ}$. The freestream velocity is 1.6m/sec and the corresponding chord Reynolds number was $Re=2.88{ imes}10^3$. Also, these experiments were carried out with a phase difference of $90^{circ}$ between the fore- and hind-wing, aerodynamic forces caused by fore-wing only and two pairs of wings were investigated according to the reduced frequency. The results show that the model with fore-wings only generates a thrust component; however, the dragonfly-type model with hind-wings with an incidence angle of $10^{circ}$ generates a drag component. The total drag is also increased with reduced frequency due to the increased lift of hind-wings.

Key Words: Dragonfly-Type Model, Phase Difference, Lift, Thrust, Reduced Frequency