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김영주(Y.J. Kim),우남섭(N.S. Woo),권재기(J.K. Kwon),정소걸(S.K. Chung),박의섭(U.S. Park),배상은(S.E. Bae),박수한(S.H. Park) 한국전산유체공학회 2011 한국전산유체공학회 학술대회논문집 Vol.2011 No.5
The seawater lift pump system is responsible for maintaining the open canal level to provide the suction flow of circulating water pump at the set point. The objective of this paper is to design a 2-stage mixed flow pump(for seawater lifting) by inverse design and to evaluate the overall performance and the local flow fields of the pump by using a commercial CFD code. Rotating speed of the impeller is 1,750 rpm with the flow rate of 2,700 ㎥/h. Finite volume mehtod with structured mesh and Realizable κ-ε turbulent model is used to guaranty more accurate prediction of turbulent flow in the pump impeller. The numerical results such as static head, brake horse power and efficiency of the mixed flow pump are compared with the reference data. Also, the periodic condition calculation method for the mixed flow pump was carried out in order to investigate the pump performance characteristics with the modification of impeller geometry.
김준섭(J.S. Kim),김규철(K.C. Kim),김기혁(G.H. Kim),장성철(S.C. Jang),우남섭(N.S. Woo),김영주(Y.J. Kim) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
This study have goal with conceptual design for offshore structures of high pressure drop control valve for localization valve for development accomplished with flow analysis based on provision of ANSI B16.34, ANSI B16.10, ANSI B16.25 In order to localize the Offshore structures high pressure drop control valve. This study is numerical analysis for zambil offshore project of high pressure drop control valve. The solver which ANSYS workbench used for offshore structures analysis. The working fluids assumed the glycerin(C3H8O3). The structural analysis used ANSYS which is a commercial code. Stress analysis result of internal pressure in valve showed lower than yield strength. This is expect to need more detail design and verification for stem and disk structure.
심해 환경 조건에서의 Drilling Riser System 해석
김영주(Y.J. Kim),우남섭(N.S. Woo),권재기(J.K. Kwon),윤상웅(S.W. Yoon),김병우(B.W. Kim) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.5
The development of deepwater oil and gas reserves constantly faces the challenge to reduce costs of all components and activities. With an increase in drilling operations in harsh environments, drilling riser requirements and limits have become more onerous due to uncertainties involved in response prediction and prolonged drilling programs. A high level of understanding is required of the response of the system to various conditions, and the design issues that govern the system. This paper presents an overview of the engineering challenges faced in designing drilling riser system for drill ship in water depths of 3,000m. Also, Static and dynamic analysis of drill riser system are carried out for the development of drill riser joint.
김영주(Y.J. Kim),우남섭(N.S. Woo),권재기(J.K. Kwon),정소걸(S.K. Chung),박의섭(E.S. Park),김정식 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
The seawater lift pump system is responsible for maintaining the open canal level to provide the suction flow of circulating water pump at the set point. The objective of this paper is to design a 2-stage mixed flow pump (for seawater lifting) by inverse design method and to evaluate the overall performance and the local flow fields of the pump by using a commercial CFD code. Rotating speed of the impeller is 1,750 rpm with the flow rate of 2,700 ㎥/h. Finite volume method with structured mesh and Realizable k-ε turbulent model is used to guaranty more accurate prediction of turbulent flow in the pump impeller. The numerical results such as static head, brake horse power and efficiency of the mixed flow pump are compared with the experimental results. The simulated results are good agreement with the experimental results less 3% error.
김영주(Y. J. Kim),우남섭(N. S. Woo),황영규(Y. K. Hwang) 한국에너지학회 2003 한국에너지공학회 학술발표회 Vol.2003 No.-
This study concerns the characteristics of helical flow in a concentric annulus with a diameter ratio of 0.52 and 0.9, whose outer cylinders are stationary and inner ones are rotating. Pressure losses and skin friction coefficients have been measured for fully developed flows of water and 0.2% aqueous of sodium carboxymethyl cellulose(CMC), respectively, when the inner cylinder rotates at the speed of 0~5OOrpm. The effect of rotation on the skin friction is significantly dependent on the flow regime. In all flow regimes, the skin friction coefficient is increased by the inner cylinder rotation. The change of skin friction coefficient corresponding to the variation of rotating speed is large for the laminar flow regime, whereas it becomes smaller as He increases for the transitional flow regime and, then, it gradually approach to zero for the turbulent flow regime.