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2상 격자 볼츠만 방법을 이용한 상승하는 기포 유동 수치 모의
유승엽(Seungyeob Ryu),박천태(Cheontae Park),한승열(Seungyeul Han),고성호(Sungho Ko) 한국유체기계학회 2009 유체기계 연구개발 발표회 논문집 Vol.2009 No.-
Free energy based lattice Boltzmann method (LBM) has been used to simulate the rising bubble flows with large density ratio. LBM reduce the spurious current of the static bubble test and satisfy with the Laplace law. The terminal rise velocity and shape of the bubbles are dependent on Eotvos number, Morton number and Reynolds number. For single bubble flows, simulations are executed for various Eotvos number, Morton number and Reynolds number, and the results are agreed well with the experiments. For multiple bubbles, the bubble flow characteristics are related by the vortex pattern of the leading bubble. The coalescence of the bubbles are simulated successfully and the subsequent results are presented.
냉각재상실사고 시 안전주입탱크 유로저항계수가 일체형 원자로에 미치는 영향
신수재(Soo Jai Shin),유승엽(Seungyeob Ryu),김영인(Young In Kim) 대한기계학회 2020 대한기계학회 춘추학술대회 Vol.2020 No.12
Since the Fukushima accident, research on passive safety systems has been conducted steadily to improve the safety of nuclear power plants. Passive safety system means a safety system that operates without operator action in the event of a reactor accident, and is operated as passive by natural forces such as gravity even without safety grade alternating current power supply. In the event of a reactor accident, such as a loss of coolant accident (LOCA), various types of injection systems may be operated to inject emergency coolant into the reactor vessel. AP1000, a passive loop type reactor, adopts core makeup tanks and nitrogen pressurized safety injection tanks, while SMART, an integral reactor, adopts core makeup tanks and pressure balanced safety injection tanks as the main injection systems during a LOCA. In this study, a numerical study was conducted to investigate the effect of the flow path resistance coefficient of the pressure balanced safety injection tank on the integral reactor during a LOCA.
냉각재상실사고 시 3단 안전주입탱크 주입 성능이 소형모듈원자로에 미치는 영향
신수재(Soo Jai Shin),유승엽(Seungyeob Ryu),김영인(Young In Kim) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Since the Fukushima accident, researches on passive safety systems have been conducted to improve the safety of nuclear power plants. Passive safety systems are operated passively by natural forces such as gravity water head. In the event of a loss of coolant accident, various types of injection systems may be operated to inject emergency coolant into the reactor coolant system. AP1000, a passive loop type reactor, adopted core makeup tanks and nitrogen pressurized safety injection tanks, while SMART, a small modular reactor, adopted core makeup tanks and pressure-balanced safety injection tanks as the passive injection systems. Researches on nitrogen-pressurized safety injection tanks and core makeup tanks have already been actively conducted, but few studies have been conducted on three-stage safety injection tank. This numerical study examines the effect of the injection performance of the three-stage safety injection tank on the small modular reactor during a loss of coolant accident.