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[특집 : 연구실 소개] 한국항공우주연구원 공기역학분야 연구 소개
이장연(J.Y.Lee),김인선(I.S.Kim) 한국전산유체공학회 2002 한국전산유체공학회지 Vol.7 No.3
한국항공우주연구원의 공기역학 분야 연구는 주로 항공기 및 발사체 개발에 관련되어있으며 형상 설계로부터 유동해석, 성능해석 및 비행시험에 이르기까지 개발사업의 중요한 부분을 담당하고 있다. 본 기고에서는 스마트 무인항공기와 성층권 비행선, 그리고 3단형과학로켓(KSR-Ⅲ) 등 주요 국가 항공우주 연구개발사업과 관련한 향공우주연구원 공기역학분야의 연구소개 및 연구개발 추진방향을 기술하였다.
이장연(J. Y. Lee) 한국전산유체공학회 2001 한국전산유체공학회지 Vol.6 No.2
Hypersonic analysis on the KSR-Ⅲ payload configuration has been performed using an axisymmetric Navier-Stokes code. A numerical code based on the Harten and Yee's upwind TVD scheme with simplified curve fits in the chemically reacting equilibrium air was developed. The carbuncle phenomenon on detached shock in front of the payload is controlled by using pressure gradients to tune the dissipation. Chemically reacting equilibrium computations for the reentry flight conditions of Mach No. 10.2, 8, 4.9 are presented and compared with the results of calorically perfect gas.
비정렬 적응격자 기법을 이용한 전진비행하는 헬리콥터 로터 블레이드의 수치 해석
박영민(Y.M. Park),이장연(J.Y. Lee),권오준(O.J. Kwon) 한국전산유체공학회 2003 한국전산유체공학회 학술대회논문집 Vol.2003 No.-
A three dimensional inviscid parallel flow solver has been developed for the simulation of rotor blades in forward flight. The computational domain is divided into stationary and rotating zones for the more efficient mesh adaptation. The conservative mesh treatment algorithm is used for the convection of flow variables and fluxes across the sliding boundary. A deforming mesh algorithm using modified spring analogy is used for the blade motion. In the present paper, detail descriptions of numerical analysis for forward flight are introduced. Some results are presented for a two bladed AH-1G rotor and compared with experimental data.
CFD를 이용한 풍동 시험 모델 지지대의 공력 특성 해석
김철완(C.W. Kim),박영민(Y.M. Park),이장연(J.Y. Lee) 한국전산유체공학회 2003 한국전산유체공학회 학술대회논문집 Vol.2003 No.-
The effect of the external balance strut on the wind tunnel model is investigated with simplified geometries. For this study, flat plate and elliptic wing are simulated with and without a cylinder. Pressure and wall shear stress distribution are analyzed to understand the effect of the cylinder.<br/>
김철완(C.W. Kim),이융교(Y.G. Lee),이장연(J.Y. Lee) 한국전산유체공학회 2007 한국전산유체공학회 학술대회논문집 Vol.2007 No.-
In the present paper, some difficulties encountered in predicting airfoil characteristics are described and solutions for those problems are discussed Since drag is determined by the amounts of pressure and, especially, shear stress, accurate estimation of shear stress is very crucial. However shear stress computation is dependent on the grid density and turbulence model, it should be consistent in preparing grid and turbulence model. When the transition from laminar to turbulent happens at the middle of airfoil, CFD solver should divide the region into laminar and turbulent region based on the transition location.
김철완(C. W. Kim),정진덕(J. D. Chung),이장연(J. Y. Lee) 한국전산유체공학회 2004 한국전산유체공학회 학술대회논문집 Vol.2004 No.-
CFD simulation for Smart-UAV(TR-E2S1) is performed to analyze its aerodynamic characteristics. Base geometry and several cases, decided by control surfaces being deflected, are simulated. To obtain the better lift characteristics, the elevator should be deflected between 10o and 20o with the incidence angle of the wing 1o.
김철완(C. W. Kim),박영민(Y. M. Park),권기정(K. J. Kwon),이장연(J. Y. Lee) 한국전산유체공학회 2004 한국전산유체공학회 학술대회논문집 Vol.2004 No.-
Drag prediction is sought for the airfoil having laminar and turbulent flow characteristics with CFD code being unable to predict transition to turbulent flow. Laminar flow simulation presents some insight to the transition position. Separate simulations with laminar and turbulent flow and their combination estimate the drag of the airfoil containing laminar and turbulent flow characteristics.
CFD를 이용한 Frisbee의 공기역학적 특성에 대한 고찰
김철완(C. W. Kim),장병희(B. H. Chang),이장연(J. Y. Lee) 한국전산유체공학회 2004 한국전산유체공학회 학술대회논문집 Vol.2004 No.-
CFD simulation is performed for 2D and 3D frisbees flying at l0m/s. For convenience of simulation, rotation of 3D model is not considered. CFD results show that pitching moment makes the nose down and holes at the leading and trailing edges improve the lift characteristics of the frisbee.