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하나로(HANARO) NRF 와 중성자 영상법을 이용한 PEM fuel cells 내의 물 배출 특성에 관한 연구
김태주(TaeJoo Kim),김종록(JongRok Kim),심철무(CheulMuu Sim),김무환(MooHwan Kim) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
An investigation into the water discharge characteristics of PEM fuel cells is carried out by using a feasibility test apparatus and the Neutron Radiography Facility (NRF) at HANARO. The feasibility test apparatus was composed of a distilled water supply line, a compressed air supply line, heating systems and single PEM fuel cells which was a 1-parallel serpentine type with a 100 ㎠ active area. Three kinds of methods were used; compressed air supply only, heating only, and a combination of the methods of a compressed air supply and heating, respectively. The resultant water discharge characteristics are different according to the applied methods. The compressed air supply only is suitable for removing the water at a flow field and a heating only is suitable for water at the MEA. Therefore in order to remove all the water at PEM fuel cells, the combination method is needed at the moment.
중성자 영상법을 이용한 PEM Fuel Cell 내의 물 유동 및 분포 가시화
김태주(TaeJoo Kim),정용미(YongMi Jung),김무환(MooHwan Kim),M. Arif,심철무(CheulMuu Sim),이승욱(SeungWoo Lee),전진수(JinSu Jeon) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
The neutron imaging technique was used to visualize the water movement and distribution at the actual operating PEM Fuel Cells. At this study, we changed the inlet humidity conditions (50 and 100 %) and output power to check the effect of water movement and distribution at the PEM Fuel Cell.
헬리콥터 무베어링 로터 허브 복합재 유연보 피로 안전수명 해석
김태주(Taejoo Kim),기영중(Youngjoong Kee),김덕관(Deog-kwan Kim),김승호(Seung-ho Kim) 한국항공우주학회 2013 韓國航空宇宙學會誌 Vol.41 No.7
7,000lb 급 헬리콥터를 위한 무베어링 로터 허브 시스템을 설계한 후, 무베어링 로터허브 시스템의 주요 구성품 중 하나인 유연보에 대해 요구수명 8,000시간을 만족하는지 확인하기 위한 피로해석을 수행하였다. 2차원 탄성 보 모델에 대한 단면 구조해석 방법을 적용하였으며, 정적구조해석을 통해 피로손상에 취약할 것으로 예상되는 두 단면에 대한 피로해석을 수행하였다. 구조해석을 위해 VABS를 사용하여 유연보 단면 형상에 대한 인장, 굽힘 및 뒤틀림 강성을 계산하였고, wohler equation을 적용하여 유연보를 구성하는 두 가지 복합재 소재에 대한 S-N 곡선을 생성하였다. CAMRAD II를 통해 무베어링 로터 시스템의 하중해석을 수행하였으며, 하중해석 결과를 HELIX/FELIX 표준하중 스펙트럼에 적용하여 무베어링 로터 시스템의 하중 스펙트럼을 생성한 후, 이를 통해 피로해석을 수행하였다. After we designed Bearingless rotor hub system for 7,000lb class helicopter, flexbeam fatigue analysis was conducted for validation of requirement life time 8,000 hours. sectional structural analysis method applying elastic beam model was used. Fatigue analysis for two sections of flexbeam which were expected to weak to fatigue damage from result of static analysis was conducted. Extension, bending and torsion stiffness of flexbeam section shape was calculated using VABS for structure analysis. S-N curve of two composite material which composed flexbeam was generated using wohler equation. Load analysis of bearingless rotor system was conducted using CAMRAD II and load analysis result was applied HELIX/FELIX standard load spectrum to generate bearingless rotor system load spectrum which was used flexbeam fatigue safe life analysis.
중성자 영상법을 이용한 Heat Pipe 내의 이상유동 가시화
김태주(TaeJoo Kim),박수지(SuJi Park),김종열(JongYul Kim),도승우(SeungWoo Doh) 한국가시화정보학회 2016 한국가시화정보학회지 Vol.14 No.3
The circular and flat heat pipe were experimentally investigated by using neutron imaging technique. This experimental study was performed at the DINGO of OPAL research reactor, Australia. The diameter of the circular heat pipe is 10 mm and the dimension of flat is 10(width) × 3(thickness) mm2, respectively. We used the distilled water as a coolant. The coolant distributions and 2-phase flow patterns were measured under heating conditions. Experimental results show that neutron imaging technique is a good tool to visualize the 2-phase flow and phenomena in the heat pipe. The coolant distributions and 2-phase flow patterns depend on installation posture of the heat pipe and volume ratio of the coolant. Finally, it was discussed to calculate the void fraction by neutron imaging technique.
중성자 영상법을 이용한 PEMFC 에서의 물 배출 특성에 관한 실험적 연구
김태주(TaeJoo Kim),김종록(JongRok Kim),김무환(MooHwan Kim),심철무(CheulMuu Sim),이승욱(SeungWoo Lee),전진수(JinSoo Jeon) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
The neutron imaging technique was used to investigate the water discharge characteristics at PEMFC. The feasibility test apparatus was consisted of pressurized air and water in order to simulate the actual operating PEMFC. The feasibility tests have been performed at two kinds of flow field type (1-parallel and 3-parallel) with 100 ㎠ active area and different flow rate (200, 400, and 850 ㏄/min). Although the water and pressurized air was supplied only into cathode, the water movement into anode was found by neutron image. The water at cathode is well discharged, but except the 850 ㏄/min at 3-parallel flow field type, the water at the anode was not removed by pressurized air. The total water volume variations at each condition were calculated from the neutron images. This technique can be used for detailed studies on water distribution and transport in the PEMFC.
훨타워 시험 수행을 위한 무힌지 블레이드 플렉셔 굽힘 강성 보강
김태주(Taejoo Kim),기영중(Youngjoong Kee) 한국항공우주학회 2014 韓國航空宇宙學會誌 Vol.42 No.5
BO-105 헬리콥터는 무힌지 로터 허브시스템이 적용되었으며, 블레이드의 루트 영역이 무힌지 허브 시스템의 플렉셔에 해당한다. 따라서 본 블레이드를 이용한 훨타워 시험 수행을 대비하여 굽힘 강성이 낮은 플렉셔 부분에 대한 굽힘 강성 보강을 수행하였다. 플렉셔 굽힘 강성 보강 수행을 위해 플렉셔 부분의 단면 형상을 모델링하여 굽힘 강성을 계산하였으며, 이를 바탕으로 강성 보강을 위한 복합재의 두께를 선정하였다. 보강된 플렉셔의 실제 굽힘 강성을 확인하기 위하여 강성보강 전 형상에 대한 강성 측정 시험과 강성보강 이후 형상에 대한 강성 측정 시험을 수행하여 결과를 비교하였다. BO-105 helicopter applies hingeless rotor hub system and blade root uses a flexure of hingeless rotor hub system. So bending stiffness reinforcement for flexure was conducted for preparation of whirl tower test using BO-105 blade. Bending moment of flexure area was calculated with FE modeling of section shape for stiffness reinforcement of flexure and thickness of composite material for reinforcement was chosen. Flexure bending stiffness reinforcement was conducted and bending stiffness measurement test was performed before and after bending stiffness reinforcement. And the test data are compared with analysis results.
고속 운영을 위한 능동거니플랩 설계 변경 및 고유진동수 예측
김태주(Taejoo Kim),김도형(Do-Hyung Kim),백승길(Seung-Kil Paek) 한국소음진동공학회 2015 한국소음진동공학회 학술대회논문집 Vol.2015 No.4
Working displacement variation by elastic deformation of Active Gurney Flap which was operated on high frequency was observed. Flap-wise natural frequency was lower than mode analysis result and hinge boundary condition was identified to be the cause through the simple modal test. Design modification for increasing natural frequency was conducted for minimizing the elastic deformation at maximum 35Hz operating condition which was design requirement condition. Brass bushing was applied instead of rotating bearing for gap minimization and Gurney Flap design modification was conducted to increase of the flap-wise natural frequency. Design modification effect was validated by natural frequency comparison with mode analysis result and modal test result of design modification model.