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오세홍 전주대학교 1999 論文集 Vol.24 No.1
이 논문은 어려운 경제위기를 맞고 있는 북한의 장래에 대해 그들의 붕괴를 막고 연착륙을 통한 통일방안으로 북한의 정보화를 위한 경제지원과 협력에 관한 연구이다. 현재 정부는 각종 경제 지원을 통해 북한의 경제위기를 해소하고 그들의 적화 야욕을 포기하도록 노력하고 있지만 북한의 모호한 태도 변화로 별로 성과를 얻지 못하고 있다. 따라서 북한이 가장 필요로 하고 있고 한국에서도 경제적 지원을 하는 데 별 무리가 없으며 파급효과가 가장 큰 정보화 지원사업을 현재 북한의 정보화 실태에 의한 가능성에 따라 장·단기 별로 분석하고자 한다.
전산유체역학 기반의 고에너지배관 파단 시 초음속 증기제트의 충돌하중 평가 방법론 개발 및 특성 평가
오세홍,최대경,박원만,최청렬,김원태,장윤석 대한기계학회 2019 大韓機械學會論文集B Vol.43 No.5
Recently, the U.S. Nuclear Regulatory Commission indicated the non-conservativeness of ANSI/ANS 58.2, which is a technical standard for evaluating the jet impingement load owing to the high-energy line break accident in a nuclear power plant. Therefore, it is necessary to develop a new methodology that can accurately evaluate the characteristics of jet impingement load caused by a supersonic steam jet. In this study, a numerical analysis methodology for evaluating this load was developed and verified. In addition, the conservativeness of the ANSI jet model was investigated using the developed methodology. The results showed that the ANSI jet model could not sufficiently consider the physical behavior of the under-expanded steam jet and predicted a lower jet impingement load than the numerical analysis results at certain conditions. Thus, it is necessary to improve the jet impingement load evaluation model or introduce a new evaluation technique. 최근 고에너지배관 파단 영향 평가에 사용되는 제트충돌하중 평가 모델의 비보수성 문제가 미국 NRC로부터 제기됨에 따라 초음속 증기제트의 충돌하중 특성을 정확하게 평가할 수 있는 평가 방법론의 개발이 필요한 실정이다. 본 연구에서는 고에너지배관 파단 시 형성되는 부족팽창 제트의 거동 및 충돌하중 특성을 평가하기 위한 수치해석 기법을 수립/검증하였으며, 이를 활용하여 기존의 제트충돌하중 평가 모델(ANSI/ANS 58.2)에 대한 타당성 및 보수성 평가를 수행하였다. 평가결과, 기존의 제트충돌하중 평가 모델은 초음속 제트의 복잡한 물리적 특성을 충분히 고려하지 못함에 따라 비보수적인 평가 결과를 도출할 가능성이 있음을 확인하였고, 제트충돌하중 평가 모델의 개선 또는 신규 평가 기법의 도입이 필요한 것으로 판단된다.
LES 난류모델을 이용한 초음속 증기 충돌제트의 과도하중특성에 대한 수치해석 연구
오세홍,최대경,박원만,김원태,장윤석,최청렬 한국압력기기공학회 2018 한국압력기기공학회 논문집 Vol.14 No.2
In the case of high-energy line breaks in nuclear power plants, supersonic steam jet is formed due to the rapid depressurization. The steam jet can cause impingement load on the adjacent structures, piping systems and components. In order to secure the design integrity of the nuclear power plant, it is necessary to evaluate the load characteristics of the steam jet generated by high-energy pipe rupture. In the design process of nuclear power plant, jet impingement load evaluation was usually performed based on ANSI/ANS 58.2. However, U.S. NRC recently pointed out that ANSI/ANS 58.2 oversimplifies the jet behavior and that some assumptions are non-conservative. In addition, it is recommended that dynamic analysis techniques should be applied to consider transient load characteristics. Therefore, it is necessary to establish an evaluation methodology that can analyze the dynamic load characteristics of steam jet ejected when high energy pipe breaks. This research group has developed and validated the CFD analysis methodology to evaluate the transient behavior of supersonic impinging jet in the previous study. In this study, numerical study on the transient load characteristics of supersonic steam jet impingement was carried out and amplitude and frequency analysis of transient jet load was performed.
오세홍,최대경,박원만,김원태,장윤석,최청렬 한국압력기기공학회 2018 한국압력기기공학회 논문집 Vol.14 No.2
Structures, systems and components of nuclear power plants should be able to maintain safety even in the event of design-basis accidents such as high-energy line breaks. The high-pressure steam jet ejected from the broken pipe may cause damage to the adjacent structures. The ANSI/ANS 58.2 code has been adopted as a technical standard for evaluating the jet impingement load. Recently, the U.S. NRC pointed out the non-conservativeness of the ANSI/ANS 58.2, because it does not take into account the blast wave effect, dynamic behavior of the jet, and oversimplifies the shape and load characteristics of the supersonic steam jet. Therefore, it is necessary to improve the evaluation method for the high-energy line break accident. In order to evaluate the behavior of supersonic steam jet, an appropriate numerical analysis technique considering compressible flow effect is needed. In this study, numerical analysis methodology for evaluating supersonic jet impingement load was developed and verified. In addition, the conservativeness of the ANSI/ANS 58.2 model was investigated using the numerical analysis methodology. It is estimated that the ANSI jet model does not sufficiently reflect the physical behavior of under-expanded supersonic steam jet and evaluates the jet impingement load lower than CFD analysis result at certain positions.