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원자로공동냉각계통 실험을 위한 표면 처리에 따른 SS400 표면 열방사율 측정
김찬수(C. S. Kim),김종환(J. H. Kim),김응선(E. S. Kim),배윤영(Y. Y. Bae),김민환(M. H. Kim) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
After the Fukushima accident, future nuclear systems are especially focused on a passive safety without additional external electricity. A Very High Temperature gas-cooled Reactor (VHTR) has shown great chance for its inherent safety. Its safety feature is the Reactor Cavity Cooling System (RCCS), which can remove the nuclear residual heat by natural convection and radiation without additional electricity and coolant injection. KAERI is constructing the RCCS thermo-hydraulic experimental facility. In this study, the emissivity with various surface modificiation conditions were measured to simulate the radiation heat transfer between the reactor vessel and RCCS.
김영우(Y. W. Kim),박원규(W. G. Park),김찬수(C. S. Kim) 한국전산유체공학회 1998 한국전산유체공학회 학술대회논문집 Vol.1998 No.-
The numerical methodology for simulating water entry behaviors of the high-speed bodies has been developed. Since the present method assumed the impact occurs within a very short time interval, the viscous effects do not have enough time to play a significant role in the impact forces, that is, the flow around a water-entry object was assumed as an incompressible potential flow and is solved by the source panel method. The elements fully submerged into the water are routinely treated, but the elements intersected by the effective planar free surface are redefined and reorganized to be amenable to the source panel method. To validate the present code, it has been applied to the ogive model and compared with experimental data Good agreement has been obtained. The water entry behavior of the bouncing phenomena from the free surface has been also simulated using the impact forces and two degree of freedom dynamic equation. Physically, acceptable results have been obtained.
고속으로 입수하는 물체에 대한 충격량 및 입수 거동 해석
김영우(Y. W. Kim),박원규(W. G. Park),김찬수(C. S. Kim) 한국전산유체공학회 1999 한국전산유체공학회지 Vol.4 No.1
The numerical methodology for computing the impact forces and water entry behaviors of high speed water entry bodies was been developed. Since the present method assumed the impact occurs within a very short time interval, the viscous effects do not have enough time to playa significant role in the impact forces, that is, the flow around a water-entry object was assumed as an incompressible potential flow and is solved by the source panel method. The elements fully submerged into the water are routinely treated, but the elements intersected by the effective planar free surface are redefined and reorganized to be amenable to the source panel method. To validate the present code, it was applied to disk, cone and ogive model and compared with experimental data. Good agreement was obtained. The water entry behavior such as the bouncing phenomena from the free surface was also simulated using the impact forces and two degree of freedom dynamic equation. Physically acceptable results were obtained.