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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.
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.
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.
허남건(N. Hur),윤성영(S. Y. Yoon),조원국(W. K. Cho),김광호(K. H. Kim) 한국자동차공학회 1993 한국 자동차공학회논문집 Vol.1 No.1
Flow 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.<br/>
승용차 탑승부내의 난방, 냉방 및 성애제거 모드에 대한 3차원 유동해석
허남건(N. G. Hur),조원국(W. K. Cho) 한국자동차공학회 1993 한국 자동차공학회논문집 Vol.1 No.2
Flows inside a passenger compartment of a 1/5 scale model vehicle have been simulated by using a general purpose FVM code, TURBO-3D. Three HV AC modes of heating, air-conditioning, and defrosting are simulated by defining three different inlets. Comparisons are made with the published experimental and computational results, giving a good agreement A method of predicting the defrosting contours on the wind shield is also proposed in the present study, which enables design modifications in design stages.<br/>
거리 · 시간 측정에 의한 고정도 타행시험법 : I . 관련이론 및 정밀도 향상방법 고찰
허남건(N. K. Hur),안이기(I. K. Ahn) 한국자동차공학회 1995 한국 자동차공학회논문집 Vol.3 No.2
A coast down test mothod has been used to determine the resistance forces on running vehicle due to the aerodynamic drag, rolling resistance and driveline resistance. Most of the tests, however, are based on the Velocity-Time measurements, which require a sophisticated velocity measuring device and contain much error by nature. In the present study a coast down test method based on Distance-Time measurements is introduced, which contains the original idea of Russian scientist Prof. Petrushov along with the suggestions for improvement of the accuracy.
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.