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RANS 방정식을 이용한 HAWT 로터 블레이드의 회전 유동장 해석
김태승(T.S. Kim),이철(C. Lee),손창호(C.H. Son),조창열(C.Y. Joh) 한국전산유체공학회 2008 한국전산유체공학회지 Vol.13 No.2
The Reynolds-Averaged Navier-Stokes(RANS) analysis of the 3-D steady flow around the NREL Phase Ⅵ horizontal axis wind turbine(HAWT) rotor was performed. The CFD analysis results were compared with experimental data at several different wind speeds. The present CFD model shows good agreements with the experiments both at low wind speed which formed well-attache flow mostly on the upper surface of the blade, and at high wind speed which blade surface flow completely separated. However, some discrepancy occurs at the relatively high wind speeds where mixed attached and separated flow formed on the suction surface of the blade. It seems that the discrepancy is related to the onset of stall phenomena and consequently separation prediction capability of the current turbulence model. It is also found that strong span-wise flow occurs in stalled area due to the centrifugal force generated by rotation of the turbine rotor and it prevents abrupt reduction of normal force for higher wind speed than the designed value.
Landsat TM 영상자료를 이용한 대청호의 영양상태 평가
한의정,김태근,정동환,천세억,김신조,유순주,황종연,김태승,김명희,Han, E.J.,Kim, K.T.,Jeong, D.H.,Cheon, S.Y.,Kim, S.J.,Yu, S.J.,Hwang, J.Y.,Kim, T.S.,Kim, M.H. 한국환경영향평가학회 1998 환경영향평가 Vol.7 No.1
The objective of this study was to use remotely sensed data, combined with in situ data, for the assessment of trophic state for Daecheong reservoir. Three Landsat TM(Thematic Mapper) imagery data were processed to portray trophic state conditions. The remotely sensed data and the measured data were obtained on 20 June 1995. Regression models have been developed between the chlorophyll-a concentration and reflectance which was converted to Landsat TM digital data. The regression model was determined based on the correlation coefficient which was higher than 0.7 and was applied to the entire study area to generate a distribution map of chlorophyll-a and trophic state. The equation, providing estimates of chlorophyll-a concentration, represented the year-to-year spatial variation of trophic zones in the reservoir. Satellite remote sensing data derived from Landsat TM had been successfully used for trophic slate mapping in Daecheong reservoir.
류정호(J.H.You),김태승(T.S.Kim),정일록(I.R.Chung),임철수(C.S.Lim),최용택(Y.T.Choi),유관식(K.S.Yoo) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_1
Several Pt-based oxidation catalyst were prepared with different methods of preparing the metal precursor solution and characterized its Pt metal size with H2 chemisorption and TEM. To evaluate the catalytic activity, the model-gas tests were performed using micro-reactor system and on-line analyzer. In addition, a prototype of diesel oxidation catalyst were made for light-duty diesel passenger car, and tested the emission reduction performance with Korean regulation test mode (CVS-75 mode) using Chassis dynamometer.<br/>
정현주(H.-J. Jung),김태승(T.-S. Kim),손창호(C.-H. Son),조창열(C.-Y. Joh) 한국전산유체공학회 2006 한국전산유체공학회지 Vol.11 No.3
Euler and Navier-Stokes flow analyses for helicopter rotor in hover were performed as low and high fidelity analysis models respectively for the future multidisciplinary design optimization(MDO). These design-oriented analyses possess several attributes such as variable complexity, sensitivity-computation capability and modularity which analysis models involved in MDO are recommended to provide with. To realize PC-based analyses for both fidelity models. reduction of flow domain was made by appling farfield boundary condition based on 3-dimensional point sink with simple momentum theory and also periodic boundary condition in the azimuthal direction. Correlations of thrust. torque and their sensitivities between low and high complexity models were tried to evaluate the applicability of these analysis models in MDO process. It was found that the low-fidelity Euler analysis model predicted inaccurate sensitivity derivatives at relatively high angle of attack.