http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
권순국(Sun-Guk Kwon),이영신(Yung-Shin Lee),김재훈(Jae-Hoon Kim),이정희(Jung-Hee Lee),윤수진(Su-Jin Yoon) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
The experiment of dome port cover under shock impact is performed with shock tube. The dome port cover blocked intake air duct up from the solid propellant during air breathing vehicle speed reach Mach 2.0. When the air breathing vehicle reach Mach 2.0, the inlet cover is removed and the dome port cover is broken to pieces by detonator or pressure of inlet air. Thus the dome port cover not only must stand the pressure of combustion chamber but also easy to break from the RAM pressure. In this study, a fracture evaluation on the Al₂O₃ ceramic spherical dome and circular plate port under impact has been presented. Ceramic were supported by the rigid body and a couple of O-ring. The Mooney-Rivlin model have been used to describe behaviors of both O-ring. And spherical dome and circular plate fracture results of the LS-DYNA code using Johnson-Holmquist(JH-2) constitutive equation was compared.
스마트 원자로냉각재펌프의 축소모형에 대한 수력성능 예측
권순국(Sun Guk Kwon),박진석(Jin Seok Park),유제용(Je Yong Yu),이원재(Won Jae Lee) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.3
본 연구에서는 SMART 원자로의 사류형 원자로냉각재펌프의 축소모형에 대한 수력성능을 예측하기 위하여 설계점을 포함한 다양한 탈설계점에서의 해석을 수행하였다. 계산시간의 효율성을 위하여 임펠러와 디퓨저 각 1개 유로로 이루어진 계산영역을 해석대상으로 선정하였다. 임펠러와 디퓨저간의 정보교환을 위하여 스테이지 기법을 사용하였다. 정상상태 비압축성 유동조건에서 축소모형의 수력성능특성을 파악하기 위하여 해석영역의 입구와 출구에서 압력차를 측정하여 양정, 효율과 축동력을 산출하였다. 수력성능 곡선은 일반적인 사류펌프의 성능특성을 잘 모사하는 것으로 나타났다. 저유량에서의 펌프 내부유동의 복잡한 흐름을 확인 하였다. An analysis for the hydraulic performance prediction was performed on a reactor coolant pump (RCP) of SMART at the off-design points as well as a design point. In order to save the analysis time efficiently, a single passage composed of an impeller and a diffuser was considered as a computational domain. A stage scheme was used as a mixing model between an impeller and a diffuser interface. A pressure difference between an inlet an outlet was obtained and used to compute the head, efficiency and break horse power (BHP) of a scale-down model under the steady state incompressible flow condition. The predicted curves of a hydraulic performance of a RCP were similar to the typical characteristic curves of a general mixed-flow pump. The complex internal fluid flow of a pump including an internal recirculation loss due to reverse flow, was observed under the low flow-rate condition.
스마트 원자로냉각재펌프의 축소모형에 대한 수력성능 예측
권순국(Sun Guk Kwon),박진석(Jin Seok Park),유제용(Je Yong Yu),이원재(Won Jae Lee) 대한기계학회 2010 大韓機械學會論文集A Vol.34 No.8
본 연구에서는 SMART 원자로의 사류형 원자로냉각재펌프의 축소모형에 대한 수력성능을 예측하기 위하여 설계점을 포함한 다양한 탈설계점에서의 해석을 수행하였다. 계산시간의 효율성을 위하여 임펠러와 디퓨저 각 1개 유로로 이루어진 계산영역을 해석대상으로 선정하였다. 임펠러와 디퓨저간의 정보교환을 위하여 스테이지 기법을 사용하였다. 정상상태 비압축성 유동조건에서 축소모형의 수력성능특성을 파악하기 위하여 해석영역의 입구와 출구에서 압력차를 측정하여 양정, 효율과 축동력을 산출하였다. 수력성능 곡선은 일반적인 사류펌프의 성능특성을 잘 모사하는 것으로 나타났다. 저유량에서의 펌프 내부유동의 복잡한 흐름을 확인하였다. An analysis was conducted to predict the hydraulic performance of a reactor coolant pump (RCP) of SMART at the off-design as well as design points. In order to reduce the analysis time efficiently, a single passage containing an impeller and a diffuser was considered as the computational domain. A stage scheme was used to perform a circumferential averaging of the flux on the impeller-diffuser interface. The pressure difference between the inlet and outlet of the pump was determined and was used to compute the head, efficiency, and break horse power (BHP) of a scaled-down model under conditions of steady-state incompressible flow. The predicted curves of the hydraulic performance of an RCP were similar to the typical characteristic curves of a conventional mixed-flow pump. The complex internal fluid flow of a pump, including the internal recirculation loss due to reverse flow, was observed at a low flow rate.
설계점 및 탈-설계점에서의 SMART 원자로냉각재펌프 축소모형에 대한 수력성능시험
권순국(Sun Guk Kwon),박진석(Jin Seok Park),장기종(Ki Jong Jang),이원재(Won Jae Lee) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
This study presents results of hydraulic performance test carried out with a scaledown pump of SMART reactor coolant pump under various flow conditions. The specific speed of a SMART reactor coolant pump was maintained to achieve hydrodynamic similitude. Operating speed of a scaledown model was fixed at the rated speed for entire performance test process. The hydraulic performance curve of a scaledown pump was obtained with summing the loop differential pressure and pump casing loss. The pump performance curve is almost the same with the pump casing differential pressures.
권순국(Sun-Guk Kwon),이영신(Young-Shin Lee),배용채(Yong-Chae Bae) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
In this study, loosely coupled fluid-structure analysis has been conducted for the low-pressure (LP) final stage rotor blade. 3-D finite element model of rotor was composed entirely of the span-wise section data that were measured by the 3-D contour measuring instrument. For achieving modeling correlation, the impact test was performed with LP 6 rotor blade in order to compare to modal analysis for 3-D FE model with the Block-Lanczos method. Computational fluid dynamics (CFD) and computational structure dynamics (CSD) solvers were loosely coupled to obtain the static aeroelastic results of the LP 6 rotor blade. To solve fluid domain Reynolds-Averaged Navier-Stokes (RANS) equations and SST turbulence model were used for steady fluid flow. Two stators and three rotors with pitch ratio of 1.04 were modeled to achieve the numerical efficiency.
발전용 저압터빈 최종단 블레이드의 정적 유체-구조 연계해석
권순국(Sun Guk Kwon),이영신(Young Shin Lee),배용채(Yong Chae Bae) 대한기계학회 2010 大韓機械學會論文集A Vol.34 No.8
본 논문에서는, 운전조건에서의 저압최종단 블레이드에 대하여 약결합 유체-구조 연계해석기법을 이용한 해석이 수행되었다. 저압터빈 최종단에 대한 해석이전에 경계조건에 대한 검증을 위하여 15도 후퇴익과 NASA Rotor 37을 대상으로 예비해석이 수행되었다. 각각의 해석결과들을 기존 문헌들과 비교하였다. 15도 후퇴익에 대한 안정상태와 불안정상태에서 동적 FSI해석이 수행되었다. 해석결과 변위가 일정한 안정상태에 비하여 고속에서는 0.05 초 만에 발산하는 결과를 산출하였다. NASA Rotor 37의 정상상태 해석결과를 바탕으로 정적·동적 FSI 해석을 수행하여 뒷전의 변형크기에 대하여 정적 FSI 결과와 동적 FSI간의 차이가 있음을 확인하였다. 저압 최종단 블레이드의 형상측정 및 동특성시험을 바탕으로 해석모델을 생성하였다. 이를 바탕으로, 운전조건에서 저압 최종단 블레이드에 대한 정적 유체-구조 연계해석을 성공적으로 수행하였다. In this study, a loosely coupled fluid-structure interaction (FSI) analysis was conducted for a low-pressure (LP) final-stage rotor blade. Preliminary FSI analyses of a 15° sweptback wing and a NASA Rotor 37 compressor blade were performed for verifying the boundary conditions. The results were compared with the established literatures for each model. The FSI analysis of the 15° sweptback wing was carried out under both stable and unstable conditions. The excessive deformation of the wing was observed within 0.05 s under the unstable condition which is higher than the divergence speed of a wing compared with the stable condition. On the basis of the results of a steady-state study, an unsteady state FSI analysis was conducted for a NASA Rotor 37. Different deformations were observed at trailing edge of the blade in the static FSI and dynamic FSI analysis. A 3D FE model of a LP rotor was generated from the span-wise section data. In order to develop a reasonable model, an impact test was performed and compared to the FE model. Using this FE model, the steady-state FSI analysis was performed successfully.
APR1400 노내하류효과 시험장치 관내 유동안정기 설치 형상에 따른 내부유동 해석
권순국(Sun-Guk Kwon),김재원,서정관(Jeong-Kwan Suh) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
Flow analyses were performed to investigate the effects of flow straightener geometry on the uniformity of internal flow by changing the number of holes for a APR1400 Downstream Effect Test Facility. The flow straightening device is installed in the inlet of fuel assembly(FA) test column. In order to uniformly build up of debris in FA test column, the uniformity of internal flow is important. In this study, the flow straightener 8×8 and 9×9 hole were adopted to evaluate flow velocity characteristics. Calculated velocity distributions at the inlet of the FA test column were compared with the condition without flow straightener.
충격파에 의한 세라믹 구형 돔의 파괴시뮬레이션에 관한 연구
권순국(Sun-Guk Kwon),이영신(Young-Shin Lee),김재훈(Jae-Hoon Kim),황권태(Kwon-Tae Hwang) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
In this study, a fracture simulation on a ceramic spherical dome port under shock wave was carried out with the finite element method by LS-DYNA which is non-linear explicit code. Simultaneously, the experiment was carried out with shock tube device. The pressures behind the reflected shock and incident shock wave were predicted by analytic equations from initial conditions and compared between analytic solutions and resulting pressures. The ideal air with constant specific heat and no heat transfer were used to basic assumptions of the analytic solution. The ceramic spherical dome was made of MACOR ceramic. For failure simulation, the failure strain value was designated as 0.00116 ㎜/㎜. The quarter model was adopted for analysis efficiency.