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유조선 이중선체구역 및 이중저구역의 고정식 가스탐지장치의 유효성 평가
김범석(B. S. Kim),이경우(K. W. Lee),김만응(M. E. Kim) 한국마린엔지니어링학회 2007 한국마린엔지니어링학회 학술대회 논문집 Vol.2007 No.-
The new requirements of fixed gas detection system for adjacent spaces of cargo oil tanks was proposed by IMO MSC 82/21/12. And, the IMO EP Sub-Committee will establish the new requirements by technical approaches and discussion. Therefore, one of the technical approaches, effectiveness of fixed hydrocarbon gas detection system in double hull spaces and double bottom spaces of tanker had been analyzed by computational fluid dynamics.
PIV에 의한 상수도 배관용 틸팅디스크 체크 밸브의 손실저감에 관한 연구
김범석(B.-S. Kim),김정환(J.-H. Kim),이중열(J.-Y. Lee),김진구(J.-G. Kim),이영호(Y.-H. Lee) 한국유체기계학회 2003 유체기계 연구개발 발표회 논문집 Vol.- No.-
In generally, under the influence of over-pressure drop, serious problems such as cavitation, choked flow, flashing and vibration has been coming around the tilting disk check valve. A PIV experiment to examine the cause of energy loss has been performed and the improvement configuration of valve seat based on this visualization results is proposed. In the visualization results, flows in the piping system became instability under the influence of the shape of boss. This unstable flows induces sudden pressure drop in the piping system. So, we change the configuration of boss as a streamlined design to be stabilized the flows. A pressure measurement has been performed to know that the influence of the configuration change. In result, the rate of pressure loss reduction is about 22% at the position of No. 2 and 24.2% at the position of No. 6 in comparison with pre-improved shape.
수평축 풍력발전용 터빈의 유동 해석을 위한 상용 CFD 코드의 적용성 평가에 관한 연구
김범석(B. S. Kim),김정환(J. H. Kim),남청도(C. D. Nam),이영호(Y. H. Lee) 한국유체기계학회 2002 유체기계 연구개발 발표회 논문집 Vol.- No.-
The purpose of this 3-D numerical simulation is evaluate the application of a commercial CFD code to predict 3-D flow characteristics of wind turbine. The experimental approach, which has been main method of investigation, appears to be its limits, the cost increasing disproportionally with the size of the wind turbines, and is hence mostly limited to observing the phenomena. Hence, the use of Computational Fluid Dynamics (CFD) techniques and Navier-Stokes solvers are considered a very serious contender. The flow solver CFX-TASCflow is employed in all computations presented in this paper. The 3-D flow separation and the wake distribution of 2 bladed Horizontal Axis Wind Turbines (HAWTs) are compared to Heuristic model and visualized 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 agree with visualized results.
CFD에 의한 1㎿ 수평축 풍력발전용 로터 설계 및 해석에 관한 연구
김범석(B. S. Kim),김유택(Y. T. Kim),남청도(C. D. NAM),김진구(J. G. Kim),이영호(Y. H. Lee) 한국유체기계학회 2004 유체기계 연구개발 발표회 논문집 Vol.- No.-
In this paper, a 1㎿ HAWT(FIL-1000) rotor blade has been designed by BEMT(Blade Element Momentum Theory) with Prandtl's tip loss. Also, a 3-D flow and performance analysis on the FIL-1000 rotor blade has been carried out by using the 3-D Navier-Stokes commercial solver (CFX-5.7) to provide more efficient design techniques to the large-scale HAWT engineers. The rated power and itsapproaching wind velocity at design point (TSR=7.5) are 1㎿ and 9.99m/s respectively. The rotor diameter is 54.5m and the rotating speed is 26.28rpm. Airfoils such as FFA W-301 , DU91-W-250, DU93-W-210, NACA 63418, NACA 63415 consist of the rotor blade from hub to tip. Recent CFX version, 5.7 was adopted to simulate 3-D flow field and to analyze the performance characteristics of the rotor blade. Entire mesh node number is about 730,000 and it is generated by ICEM-CFD to achieve better mesh quality. The predicted maximum power occurringat the design tip speed ratio is 931.45㎾. Approaching to the root, the inflow angle becomes large, which causesthe blade to be stalled in the region. Therefore, k-ω SST turbulence model was used to predict the quantitative flow information more accurately. Application of commercial CFD code to optimum blade design and performance analysis was proved to be more effective environment to HAWT blade designers.