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분리하중에 대한 항공기용 외부연료탱크 구조 건전성 평가
김현기(Hyun-gi Kim),김성찬(Sungchan Kim),박민수(Min-su Park),안수홍(Su-hong An) 항공우주시스템공학회 2024 항공우주시스템공학회지 Vol.18 No.1
The external fuel tank of an aircraft is a main component that can increase the cruising range of the aircraft. It must be able to be stably separated from the pylon in an emergency situation. At this time, a separation load is applied to the fin and the pivot of the external fuel tank. To stably separate the external fuel tank, the structural soundness of the fin and the pivot must be confirmed. In this study, structural tests were conducted to verify the structural integrity of the external fuel tank pin and pivot when the external fuel tank was separated from the aircraft. Results are then presented. In this paper, a test configuration diagram consisting of the hydraulic and load control equipment, data acquisition system, and pneumatic supply unit used in the structural test was explained. Test installation and test load application plan for each test condition were provided. As results of the structural test, it was found that test load and internal pressure of the test specimen were properly controlled within the allowable range in each test. It was confirmed that serious structural defects in the test specimen did not occur under required load conditions. In conclusion, through structural test for design limit load and design ultimate load, it was proven that the fin and pivot of the external fuel tank for aircraft covered in this study had sufficient structural strength.
문성목(Seong-Mok Moon),조남경(Nam-Kyung Cho),전성복(Sung-Bok Jun),안수홍(Su-Hong An),이경훈(Kyoung-Hoon Lee),김동환(Dong-Hwan Kim) 한국추진공학회 2014 한국추진공학회 학술대회논문집 Vol.2014 No.5
본 연구에서는 추진기관 시험설비 화염유도로 기본 설계안에 대한 열적 안전성을 검토하기 위하여 3차원 화염냉각 해석을 수행하였으며, 화염냉각을 위한 최적의 냉각수 유량을 도출하였다. 화염과 냉각수 간의 열전달 및 상변화 과정을 모사하기 위하여 Mixture 다상유동모델을 이용하였으며, 단일 화학종 비반응 플룸모델을 적용하여 화염냉각 해석을 수행하였다. 본 해석결과를 통하여 냉각수 유량에 따른 화염유도로 벽면에서의 최고 온도값을 도출하였으며, 콘크리트 내화 최고온도에 해당하는 최적의 냉각수 유량을 확인하였다. In this study, a 3-D flame cooling analysis is conducted to examine a thermal safety for the flame deflector design of the propulsion test facility, and the optimal flow rate of coolant for the flame cooling is evaluated from the numerical results. The mixture multiphase model is applied for the simulation of heat transfer and phase exchange process between flame and cooling water, and a numerical analysis using the single species unreacted model for the exhaust plume is carried out for the flame cooling. The numerical analysis for the flame cooling predicts maximum temperature on the flame deflector wall for the different coolant flow rate, and shows the optimal flow rate of coolant corresponding to the maximum fireproof temperature of concrete.