본 가시화 연구는 잠자리 유형 모델의 위상차에 관한 후류의 변화를 관찰함으로써 위상차 효과를 정성적으로 조사하기 위해 수행되었다. 본 가시화 실험에 사용된 잠자리 유형 모델은 잠자리의 날개 형상을 모방한 앞뒤 날개를 가진 쌍으로 구성되어 있으며, 잠자리의 플래핑 날개를 확대하여 제작하였다. 본 연구는 smoke-wire 기법을 통한 가시화 실험이 수행되었고, 정확한 날개위치각도를 찾기 위하여 동기화 조정장치가 사용되었다. 이때 날개위치각도의 불확실성은 약 $\pm$$1^{\cire}$정도이며, 순간 날개 위치각도는 $-16.5^{\cire}$에서 $22.8^{\cire}$까지 변한다. 본 실험은 앞ㆍ뒤 날개의 위상차가 $0^{\cire}$, $90^{\cire}$, $180^{\cire}$, $270^{\cire}$인 경우 수행되었다. 본 연구 결과 위상차 $90^{\cire}$, $180^{\cire}$, $270^{\cire}$에서는 Karman Vortex가 발생되지만, 위상차 $0^{\cire}$에서는 Karman Vortex 현상이 관찰되지 않는다.
본 가시화 연구는 잠자리 유형 모델의 위상차에 관한 후류의 변화를 관찰함으로써 위상차 효과를 정성적으로 조사하기 위해 수행되었다. 본 가시화 실험에 사용된 잠자리 유형 모델은 잠자리의 날개 형상을 모방한 앞뒤 날개를 가진 쌍으로 구성되어 있으며, 잠자리의 플래핑 날개를 확대하여 제작하였다. 본 연구는 smoke-wire 기법을 통한 가시화 실험이 수행되었고, 정확한 날개위치각도를 찾기 위하여 동기화 조정장치가 사용되었다. 이때 날개위치각도의 불확실성은 약 $\pm$$1^{\cire}$정도이며, 순간 날개 위치각도는 $-16.5^{\cire}$에서 $22.8^{\cire}$까지 변한다. 본 실험은 앞ㆍ뒤 날개의 위상차가 $0^{\cire}$, $90^{\cire}$, $180^{\cire}$, $270^{\cire}$인 경우 수행되었다. 본 연구 결과 위상차 $90^{\cire}$, $180^{\cire}$, $270^{\cire}$에서는 Karman Vortex가 발생되지만, 위상차 $0^{\cire}$에서는 Karman Vortex 현상이 관찰되지 않는다.
A visualization study was carried out to investigate the effects of phase difference qualitatively by examining wake pattern on the phase difference of a dragonfly type wing model. The model was built with scaled-up, flapping wings composed of a paired wing with fore- and hind-wings in tandem that m...
A visualization study was carried out to investigate the effects of phase difference qualitatively by examining wake pattern on the phase difference of a dragonfly type wing model. The model was built with scaled-up, flapping wings composed of a paired wing with fore- and hind-wings in tandem that mimick the wing form of a dragonfly. The present study was conducted by using the smoke-wire technique and an electronic device below the tandem wings was mounted to find the exact wing position angles. Uncertainties in wing position angle are about $\pm$$1.0^{\cire}$ and instantaneous wing positional angle varies from $-16.5^{\cire}$ to $+22.8^{\cire}$. The tests were made at phase differences between the fore-wing and hind-wing at $0^{\cire}$, $90^{\cire}$, $180^{\cire}$ and $270^{\cire}$. The results show that Karman vortex structures were produced at phase differences of $90^{\cire}$, $180^{\cire}$ and $270^{\cire}$, but Karman vortex structures were not observed at the phase difference of $0^{\cire}$.
A visualization study was carried out to investigate the effects of phase difference qualitatively by examining wake pattern on the phase difference of a dragonfly type wing model. The model was built with scaled-up, flapping wings composed of a paired wing with fore- and hind-wings in tandem that mimick the wing form of a dragonfly. The present study was conducted by using the smoke-wire technique and an electronic device below the tandem wings was mounted to find the exact wing position angles. Uncertainties in wing position angle are about $\pm$$1.0^{\cire}$ and instantaneous wing positional angle varies from $-16.5^{\cire}$ to $+22.8^{\cire}$. The tests were made at phase differences between the fore-wing and hind-wing at $0^{\cire}$, $90^{\cire}$, $180^{\cire}$ and $270^{\cire}$. The results show that Karman vortex structures were produced at phase differences of $90^{\cire}$, $180^{\cire}$ and $270^{\cire}$, but Karman vortex structures were not observed at the phase difference of $0^{\cire}$.
Ellington, C. P., 'The Novel Aerodynamics of Insect Flight: Applications to Micro-Air Vehicles,' The Journal of Experimental Biology, Vol. 202. 1999, pp.3439-3448
Alexander, D. E., 'Studies on Flight Control and Aerodynamics in Dragonflies.' Ph. D. Dissertation. Duke University. Durham, NC., 1982
Alexander, D. E., 'Unusual Phase Relationships between the Forewings and Hindwings in Flying Dragonflies,' The Journal of Experimental Biology. Vol. 109. 1984, pp.379-383
Mittal, R., Utturkar, Y. and Udaykumar, H. S.,'Computational Modeling and Analysis of Biomimetic Flight Mechanisms.' 2002, AIAA Paper 2002-0865
Somps, C. and Luttges, M., 'Dragon Flight: Novel Uses of Unsteady Separated Flows,' Science, Vol. 228, 1985, pp. 1326-1328
Chasman, D. and Chakravarthy, S., 'Computational and Experimental Studies of Asymmetric Pitch/Plunge Flapping The Secret of Biological Flyers,' 2001 AIAA paper 2001-0859
김송학, 장조원, '잠자리 유형 날개의 무차원 진동수에 따른 가시화 연구.' 한국가시화정보학회지, 제2권, 제2호, 2004년 12월,pp. 58-65
Corke, T., Koga, D., Deubka, R., and Nagbib, H., 'A New Technique for Introducing Controlled Sheets of Smoke Streaklined in Wind Tunnels.' roceedings of International Congress on Instrumentation in Aerospace Simulation Facilities, 1985, pp.74-80
손명환. 백동기. 임기철. 박민우. 'Smoke Wire 기법을 사용한 3차원 날개릐 소용돌이후류 흐름가시화,' 한국항공우주학회지, 제18권, 제1호, 1990년 3월, pp.81-91
Chang. J. W., and Park, S. O., 'Measurements in the Tip Vortex Roll-up Region of an Oscillating Wing.' AIAA Journal, Vol, 38. No.6, 2000, pp. 1092-1095
Chang, J. W., and Eun. H. B., 'Reduced Frequency Effects on the Near-Wake of an Oscillating Elliptic Airfoil,' KSME International Journal, Vol. 17. No.8. 2003. pp.1234-1245
※ AI-Helper는 부적절한 답변을 할 수 있습니다.