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수중폭발 이론을 사용한 노심폭주사고 시 노심 팽창 및 에너지 거동 수치해석
강석훈(S.H. Kang) 한국전산유체공학회 2016 한국전산유체공학회지 Vol.21 No.3
A numerical analysis is conducted to estimate the core expansion and the energy behaviors induced by a core disruptive accident in a sodium-cooled fast reactor. The numerical formulation based on underwater explosion theory is carried out to simulate the core explosion inside the reactor vessel. The transient pressure, temperature and expansion of the core are examined by solving the equation of state and nonlinear governing equation of momentum conservation in one-dimensional spherical coordinates. The energy balance inside the computation domain is examined during the core expansion process. Heat transfer between the core and the sodium coolant, and the bubble rise during the expansion process are briefly investigated.
금속연료 소듐냉각고속로 중대사고 고유안전특성 SAS4A/SASSYS-1 코드 전산해석
강석훈(S.H. Kang),Adrian Tentner 한국전산유체공학회 2021 한국전산유체공학회지 Vol.26 No.1
The inherent safety characteristics of the metal fuel core sodium-cooled fast reactor (SFR) are investigated using the SAS4A metal fuel version code, originally developed for the analysis of postulated severe accidents in oxide fuel SFR and significantly extended to allow the mechanistic analysis of severe accidents in metallic fuel SFRs. The paper provides an overview of the SAS4A key metal fuel models and the safety characteristics of the metal fuels. The analysis is performed for a postulated unprotected fuel assembly inlet blockage accident in the metal fuel Prototype Gen-IV Sodium Fast Reactor (PGSFR). The evolution of local fuel components during the pre-transient irradiation, molten fuel relocation behavior inside and outside of cladding, and their impacts on reactivity and power history during the transient are numerically analyzed. The favorable characteristics of the metal fuel, significant decreases in reactivity and power due to favorable molten fuel relocation and the fuel thermo-physical property change, are analyzed in the results.
3차원 연소장에서의 베타 형태의 스털링엔진 고온 열교환기 설계를 위한 수치해석 연구
강석훈(S.H. Kang),김혁주(H.J. Kim),정대헌(D.H. Chung) 한국전산유체공학회 2011 한국전산유체공학회지 Vol.16 No.2
Numerical study is conducted to design the high temperature heat exchanger of Stirling engine by using the commercial CFD solver, FLUENT. The Fin-tube type of heat exchanger is designed as a reference model by considering the type of engine which is β-configuration. To .find the optimal design of heat exchanger in heat transfer capacity numerical calculation is conducted by changing the shape, the number, and material of reference model in three-dimensional combustion field. Adjusted one-way constant velocity of working fluid that is helium is considered as the representative velocity of oscillating flow. The optimal design of heat exchanger considering the heat transfer capability is suggested by using the calculation results.
신동옥,최재철,강석훈,박영삼,이영기,D.O. Shin,J. Choi,S.H. Kang,Y.S. Park,Y.-G. Lee 한국전자통신연구원 2024 전자통신동향분석 Vol.39 No.1
There have been continuous requirements for developing more reliable energy storage systems that could address unsolved problems in conventional lithium-ion batteries (LIBs) and thus be a proper option for large-scale applications like energy storage system (ESS). As a promising solution, aqueous metal-ion batteries (AMIBs) where water is used as a primary electrolyte solvent, have been emerging owing to excellent safety, cost-effectiveness, and eco-friendly feature. Particularly, AMIBs adopting mutivalence metal ions (Ca<sup>2+</sup>, Mg<sup>2+</sup>, Zn<sup>2+</sup>, and Al<sup>3+</sup>) as mobile charge carriers has been paid much attention because of their abundance on globe and high volumetric capacity. In this research trend review, one of the most popular AMIBs, zinc-ion batteries (ZIBs), will be discussed. Since it is well-known that ZIBs suffer from various (electro) chemical/physical side reactions, we introduce the challenges and recent advances in the study of ZIBs mainly focusing on widening the electrochemical window of aqueous electrolytes as well as improving electrochemical properties of cathode, and anode materials.