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글라이딩 하는 잠자리 날개 주름의 영향에 대한 수치해석적 연구
김원갑(Won-Kap Kim),변도영(Do-Young Byun),박훈철(HoonCheol Park) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
We investigate the aerodynamic performance of the dragonfly wing which has the cross-sectional corrugation by using the static 2-dimensional unsteady simulation. Computational condition is at Re=150, 1400 and 10,000 with the angles of attack from 0 to 40 degrees. As computational results, lift coefficients are increased by the wing corrugation at all Reynolds number. But corrugation have little influence on the drag coefficients. The flow such as vortex in the valley of corrugation and near the edge of corrugation are locally different from the elliptic wing. But such local flow have little influence on the time averaged wing performance. From the numerical experiment in this study, suction side corrugation of the wing have very little influence on increase of the lift coefficient at the positive angle of attack.
글라이딩 하는 잠자리 날개 주름의 영향에 대한 수치해석적 연구
김원갑(Won-Kap Kim),변도영(Do-Young Byun),박훈철(HoonCheol Park) 한국항공우주학회 2008 韓國航空宇宙學會誌 Vol.36 No.9
단면상에 주름이 있는 잠자리 날개의 공기역학적 성능을 검토하기 위해 정지상태에 있는 2차원 비정상 수치해석을 수행하였다. 해석 조건으로서 레이놀즈수는 150과 1400, 10,000이며 받음각은 0도에서 40도까지 변화시켰다. 해석 결과 임계각 이상의 받음각에서는 주름에 의한 양력의 증가량은 거의 일정하게 유지되며 또한 날개 윗면의 주름은 양력의 증가에 거의 영향이 없음을 알 수 있었다. We investigate the aerodynamic performance of the dragonfly wing which has the cross-sectional corrugation by using the static 2-dimensional unsteady simulation. Computational condition is at Re=150, 1400 and 10,000 with the angles of attack from 0 to 40 degrees. As computational results, the increment of the lift coefficient by corrugation is nearly constant over the critical angle of attack. Also, upper side corrugation of the wing have very little influence on increase of the lift coefficient.
Particle Image Velocimetry (PIV)를 이용한 딱정벌레목 곤충의 날갯짓 연구
유용훈(YongHoon Yoo),김지훈(Jihoon Kim),변도영(Doyoung Byun),홍영선(Youngsun Hong),박훈철(Hooncheol Park),변영환(YoungHwan Byun),김성균(SungKyun Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
To investigate the characteristics of Coleopteran insects flapping, this research is considered. Flow visualization around the wing of beetles is conducted by PIV (Particle imaging velocimetry) method. As a results, at the middle of up-stroke and down-stroke, velocity fields are calculated by PIV. Also using simple calculation program, vorticity fields are analyzed. Vortices generated by previous strokes are found around the wing.