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김범석(BeomSeok Kim),남청도(ChungDo Nam),김유택(YouTaek Kim),김진구(JinGu Kim),이영호(YoungHo Lee) 한국마린엔지니어링학회 2005 한국마린엔지니어링학회 학술대회 논문집 Vol.2005 No.-
The optimum design and the performance analysis software called POSEIDON for the HAWT (Horizontal Axis Wind Turbine) was developed by use of BEMT. The Prandtl's tip loss theory was adopted to consider the blade tip loss. The lift and the drag coefficient of S-809 airfoil were predicted via X-FOIL and also the post stall characteristics of S-809 were estimated by the Viterna's equations. All the predicted aerodynamic characteristics are fairly well agreed with the wind tunnel test results, performed by Sommers in Delft university of technology. The rated power of the testing rotor is 20㎾(FIL-20) at design conditions. The experimental aerodynamic parameters and the X-FOIL data were used for the power prediction of the FIL-20 respectively. The comparison results shows good agreement in power prediction.
이승엽(SeungYoub LEE),전현태(HyunTae JEON),남청도(ChungDo NAM),이영호(YoungHo LEE) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.6
The mixers are used in several industrial applications where it is necessary to strongly mix two reactants in a short period of time. However, despite their widespread use, mixing flow characteristics in these systems have not been rigorously investigated. The present study aims to clarify unsteady flow characteristics induced by various impellers in a tank by CFD. In this research, axial and radial type impellers are used. The rotating speed of impellers are 100, 200 and 300 rpm.
CFD에 의한 산업용 교반기내의 비정상 유동특성에 관한 연구
이승엽(SeungYoub LEE),최영도(YoungDo CHOI),김정환(JeongHwan KIM),남청도(ChungDo NAM),이영호(YoungHo LEE) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
The mixers are used in various industrial fields where it is necessary to mix two reactants in a short period of time. However, despite their widespread use, complex unsteady flow characteristics of industrial mixers has not been investigated systematically. This paper presents calculated results of the unsteady flow characteristics in a Industrial Mixer by CFD analysis. The results show that quite different flow patren if found between steady and unsteady calculation.
수평축 풍력발전용 터빈의 유동해석 및 성능예측에 대한 CFD의 적용성 평가에 관한 연구
김범석(BeomSeok Kim),김정환(JeongHwan Kim),김유택(YouTaek Kim),남청도(ChungDo Nam),이영호(Young Ho Lee) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
The purpose of this 3-D numerical simulation is evaluate the application of a commereial CFD code to predict 3-D flow and power characteristics of wind turbines. The experimental approach, which has been main method of investigation, appears to be its limits, the cost increasing with the size of the wind turbines, hence mostly limited to observing the phenomena on rotor blades. Therefore, the use of Computational Fluid Dynamics (CFD) techniques and Navier-Stokes solvers are considered a very serious contender. The flow solver CFX-TASC flow is employed in all computations in this paper. The 3-D flow separation and the wake distribution of 2 and 3 bladed Horizontal Axis Wind Turbines (HAWTs) are compared to Heuristic model and smoke-visualized experimental result by NREL(National Renewable Energy laboratory). Simulated 3-D flow separation structure on the rotor blade is very similar to Heuristic model and the wake structure of the wind turbine is good consistent with smoke-visualized result. The calculated power of the 3 balded rotor by CFD is compared with BEM results by TU-Delft. The CFD results of which is somewhat consist with BEM resulst, under an error less than 10%.