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원자로 냉각재 펌프의 과도 상태의 유동 및 열전달 해석 연구
허남건,김성원,유기풍,김승태,Hur, N.,Kim, S.,Yoo, K.-P.,Kim, S. T. 한국유체기계학회 2000 한국유체기계학회 논문집 Vol.3 No.2
The structural analysis of a reactor coolant pump(RCP) of a nuclear power plant is very important for the safety assessment of the plant. Accurate boundary conditions for the heat transfer coefficient are required for reliable thermal stress analysis of the pump casing, especially in transient operations of the pump since the coolant properties are largely dependent on operational conditions. In the present study, a 3D mixed flow type coolant pump was modeled from the RCP drawings and analyzed in the steady state and number of transient flow conditions by using a commercial code STAR-CD. From the result of the computation, it is seen that the average heat transfer coefficients for the cases considered are found to be the suggested values of the manufacturer, Westinghouse Energy System. The unevenness in local heat transfer coefficients, however, is found to be considerable so that the use of average heat transfer coefficients in all boundaries might not give reliable thermal stress predictions.
유동/구조 연성해석 기법에 의한 Foil Bearing 유동특성해석
허남건(N. Hur),이상훈(S.H. Lee),원찬식(C.S. Won),김영규(Y. Kim),전승배(S.B. Jeon) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.9
The leaf type foil bearing is self-acting surface bearing. When in operation, foil bearing support load on an air film between rotating shaft and bearing. But, as system on start-up or shutdown, sliding contact between the shaft and foil surfaces cause wear. Therefore pressure-flow characteristics and deformation of leaf type foil bearing were studied using a flow/structure interaction analysis. With this method, we obtained final shape of foil bearing for various rotating speed. The flow/structure interaction analysis of the present study can be effectively used to design the leaf type foil bearing.
원자로 냉각재 펌프의 과도 상태의 유동 및 열전달 해석 연구
허남건(N. Hur),김성원(S. Kim),유기풍(K.-P. Yoo),김승태(S. T. Kim) 한국유체기계학회 1999 유체기계 연구개발 발표회 논문집 Vol.- No.-
The structural. analysis of a reactor coolant pump(RCP) of a nuclear power plant is very important for the safety assessment of the plant. Accurate boundary conditions for the heat transfer coefficient are required for reliable thermal stress analysis of the pump casing, especially in transient operations of the pump since the coolant properties are largely dependent on operational conditions. In the present study, a 3D mixed flow type coolant pump was modeled from the RCP drawings and analyzed in the steady state and number of transient flow conditions by using a commercial code STAR-CD. From the result of the computation, it is seem that the average heat transfer coefficients for the cases considered are found to be the suggested values of the manufacturer, Westinghouse Energy System. The unevenness in local heat transfer coefficients, however, is found to be considerable so that the use of average heat transfer coefficients in all boundaries might not give reliable thermal stresses.
사각 공동구의 하부 벽면 가진의 진폭 변화에 따른 자연 대류 유동의 공진 현상에 관한 연구
허남건(N. Hur),김욱(W. Kim),김영규(Y. Kim),강병하(B. H. Kang) 한국전산유체공학회 2000 한국전산유체공학회 학술대회논문집 Vol.2000 No.10
In the present study a numerical simulation is performed on a natural convection inside a square cavity with a vibrating bottom wall. The heat transfer coefficients for various amplitudes of the bottom wall vibration were compared to the case without the bottom wall excitation. From the results, it is seen that the local temperature distribution in a cavity becomes more uniform as the amplitude of the bottom wall vibration is increased. Also, it was seen that the heat transfer coefficient increased on the heating wall as the applied amplitude increased.
허남건(N. Hur),윤성영(S. Y. Yoon),조원국(W. K. Cho),김광호(K. H. Kim) 한국자동차공학회 1992 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1992 No.11
Row fields in model engine cooling passages are studied numerically by using TURBO-3D program, a finite volume based 3-D turbulent flow program adopting a general body fitted coordinate system. The effects of exit position on mass flow rate at each gasket hole are examined for a model cooling passage in order to understand the flow distribution inside the water jacket. The results of the present study can be applied to the design of high performance, high reliability engine.
허남건(N. Hur),원찬식(C.-S. Won),손기현(G. Son),유흥선(H.-S. Ryou),신동신(D. Shin) 한국전산유체공학회 2004 한국전산유체공학회 학술대회논문집 Vol.2004 No.-
A general purpose program NUFLEX for the analysis of 3-D heat/fluid flow in complex geometry with pre/post processor have been developed, which consists of a flow solver based on FVM. and a dedicated pre/post processor. The program employs a general non-orthogonal grid system and solve laminar and turbulent flows with standard and RNG k-ε turbulence models. NUFLEX is capable of analysing two-phase flow with topologically complex interface, turbulent diffusion combustion, solidification problems and magnetic flow. For the purpose of verification of the program and testing the applicability, several practical problems are solved and compared with the available data. Comparison of the NUFLEX results with that by the STAR-CD program has been also made for the same flow configuration and grid structure.