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원전 배관 파단전누설 평가를 위한 탄소성 파괴역학 평가 프로그램 개발
박준근,허남수,김예지,이상민,Park, Jun-Geun,Huh, Nam-Su,Kim, Ye-Ji,Lee, Sang-Min 한국압력기기공학회 2020 한국압력기기공학회 논문집 Vol.16 No.2
In this paper, a fracture mechanics evaluation system which can be used to assess the leak-before-break (LBB) of nuclear piping is developed. Existing solutions for calculating the fracture mechanics parameters (J-integral and crack opening displacement) required for LBB evaluation were firstly presented. Then a module for calculating J-integral and COD was developed, with an additional module for predicting the critical load based on the crack driving force diagram to finally develop a fracture mechanics evaluation system. To confirm the validity of the proposed evaluation system, finite element (FE) analysis was performed, and the FE J-integral and COD results were compared with prediction results using the J-integral and COD estimations program. Furthermore, the critical load assessment module was verified by comparing the actual pipe test results (Battelle test data) with prediction results using the proposed program.
박준근(Park, Joon-Guen),이신구(Lee, Shin-Ku),임성광(Lim, Sung-Kwang),배중면(Bae, Joong-Myeon) 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.05
Characteristics of an autothermal reformer at various operating parameters have been studied in this paper. Numerical method has been used, and simulation model has been developed for the analysis. Full Combustion reaction, Steam Reforming(SR) reaction, Water-Gas Shift(WGS) reaction, and Direct Steam Reforming(DSR) reaction are assumed as dominant chemical reactions in the autothermal reformer. Simulation results are compared with experimental results for code validation. Operating parameters of the autothermal reformer are inlet temperature, Oxygen to Carbon Ratio(OCR), Steam to Carbon Ratio(SCR), and Gas Hourly Space Veolcity(GHSV). SR reaction rate decreases with low inlet temperature. If OCR is increased, H₂ yield is increased but optimal point is suggested. WGS reaction is activated with high SCR. When GHSV is increased, reforming efficiency is increased but pressure drop may decrease the system efficiency.
금속지지체형 고체산화물연료전지의 스택 매니폴드 구조에 의한 열 및 물질전달 연구
박준근(Joonguen Park),배중면(Joongmyeon Bae) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.5
본 논문에서는 연료전지 스택에 수소 및 산소를 공급하기 위한 매니폴드를 설계하고 매니폴드 구조에 따른 열 및 물질전달 변화를 분석하고자 한다. 전기화학반응식, 물성식, 지배방정식을 통합한 전산해석 코드를 개발하고, 단전지의 전류밀도 분포 및 온도분포를 해석한다. 6장의 단전지가 적층된 스택을 설계하고 매니폴드 구조를 변화시킨다. 병렬구조, 직렬구조, 확장구조, 축소구조를 비교한 결과 병렬구조가 가장 균일한 전류밀도 분포를 가지고 압력강하도 가장 작다. 직렬구조는 온도 및 전류밀도 분포 차이가 크고 차압이 병렬구조의 50 배 이상 발생한다. In this paper, the manifold design in order to supply hydrogen and oxygen to fuel cell stacks is studied and heat and mass transfer according to the manifold design is investigated. The numerical simulation code which incorporates electrochemical reactions, physical property equations and governing equations is developed. And then, the single cell is analyzed to present the current density and temperature distribution. The stack which laminates 6 single cells is designed and the manifold shapes are changed. Parallel type, serpentine type, spread out type and taper off type are compared with each other. The parallel type has the most regular current density distribution and the lowest pressure drop. The pressure drop of serpentine type is 50 times bigger than that of parallel type and the serpentine type has the largest difference in the current density and temperature distribution.