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혼합날개가 부착된 6×6 봉다발 부수로에서의 열전달 향상을 위한 실험적 연구
변선준,신용철,민경호,방윤곤,채영종 한국기계기술학회 2015 한국기계기술학회지 Vol.17 No.2
The present experimental study investigates single-phase heat transfer coefficients downstream of support grid in 6×6 rod bundles. Support grid with Split mixing vanes enhance heat transfer in rod bundles by generating turbulence but this turbulence is confined to a short distance. Support grid with large scale vortex flow(LSVF) mixing vanes enhanced heat transfer to a longer distance. In this study, the experiments were performed at reynolds numbers of 50,000. The characteristics of the heat transfer enhancement of the Split mixing vane and those of the LSVF mixing vane were compared. The results showed that the characteristics of the heat transfer enhancement of rods by the Split mixing vane were limited to 10 Dh after the spacer grid, but those by the LSVF mixing vane were maintained until 15 Dh after the spacer grid. For the reynolds number of 50,000, the heat transfer enhancement effect was 3.0% greater when using the LSVF mixing vane than when using the Split mixing vane between the 1 ∼ 15 Dh interval after the spacer grid.
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혼합날개가 부착된 6×6 봉다발 부수로에서의 열전달 향상을 위한 실험적 연구
변선준,신용철,민경호,방윤곤,채영종 한국기계기술학회 2015 한국기계기술학회지 Vol.17 No.2
The present experimental study investigates single-phase heat transfer coefficients downstream of support grid in 6×6 rod bundles. Support grid with Split mixing vanes enhance heat transfer in rod bundles by generating turbulence but this turbulence is confined to a short distance. Support grid with large scale vortex flow(LSVF) mixing vanes enhanced heat transfer to a longer distance. In this study, the experiments were performed at reynolds numbers of 50,000. The characteristics of the heat transfer enhancement of the Split mixing vane and those of the LSVF mixing vane were compared. The results showed that the characteristics of the heat transfer enhancement of rods by the Split mixing vane were limited to 10 Dh after the spacer grid, but those by the LSVF mixing vane were maintained until 15 Dh after the spacer grid. For the reynolds number of 50,000, the heat transfer enhancement effect was 3.0% greater when using the LSVF mixing vane than when using the Split mixing vane between the 1 ∼ 15 Dh interval after the spacer grid.
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전병국,윤은구,배황,양진화,류성욱,방윤곤,이성재,박현식 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.3
A two-phase natural circulation test using SMART integral test loop (SMARTeITL) was conducted toexplore thermo-hydraulic phenomena of two-phase natural circulation in the SMART reactor. Specifically,the test examined the natural circulation in the primary loop under a stepwise coolant inventoryloss while keeping the core power constant at 5% of the scaled full power. Based on the test results, threeflow regimes were observed: single-phase natural circulation (SPNC), two-phase natural circulation(TPNC), and boilerecondenser natural circulation (BCNC). The flow rate remained steady in the SPNC,slightly increased in the TPNC, and dropped abruptly and maintained in the BCNC. Using a natural circulationflow map, the natural circulation characteristic in the SMARTeITL was compared with those inpressurized water reactor simulators. In the SMARTeITL, a BCNC regime appeared instead of siphoncondensation and reflux condensation regimes because of the use of once-through steam generators. © 2021 Korean Nuclear Society, Published by Elsevier Korea LLC. This is an open access article under th
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SMART 원자로 자연대류 현상 모의 개별효과실험 및 해석
박지환(Ji-Hwan Park),한기석(Ki-Seok Han),전병국(Byong Guk Jeon),윤은구(Eun-Koo Yun),방윤곤(Yun-Gon Bang),박현식(Hyun-Sik Park) 한국유체기계학회 2019 한국유체기계학회 논문집 Vol.22 No.1
The SMART is a small modular nuclear reactor that was developed at the Korea Atomic Energy Research Institute and is in the process of being evaluated using intense validation tests for future construction in Saudi Arabia. The system design was based on accidents that include station black out, in which the SMART can assure integrity of nuclear fuels by removing decay heat through natural circulation. Facility to Investigate Natural Circulation in SMART (FINCLS) was constructed to understand single- and two-phase natural circulation phenomena in SMART using a simplified loop. Two single-phase natural circulation tests were performed under two different pressures(i.e., 1.1 MPa and 2.5 MPa). When the heater power was increased, the circulation mass flow rate increased due to the higher density-driven force. The experimental results were compared with those from a force-balance equation and from a code calculation. For the code calculation, the MARS-KS code was employed by considering FINCLS geometry and the heat loss. The error in the flow rate from the force-balance equation improved from 6.2% (1.1 MPa) and 10.7% (2.5 MPa) to 2.7% (1.1 MPa) and 3.0% (2.5 MPa), respectively, when the core to steam generator elevation difference was defined based on the density distribution rather than the geometry. In the MARS-KS code calculation, the error was 1.1 % at 1.1 MPa, but the error increased to 5.5% at 2.5 MPa. At 2.5 MPa, the temperature profile inside the steam generator was not well reproduced, which led to higher driving force. Further analysis is required using a wider range of test data.
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