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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학위논문
- 저자정보
- 지도교수
- 정재준
- 발행연도
- 2019
- 저작권
- 부산대학교 논문은 저작권에 의해 보호받습니다.
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초록· 키워드
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In the thermal-hydraulic system codes (such as RELAP5/MOD3, MARS, SPACE, TRACE, CATHARE, etc.), the subcooled boiling model consists of a net vapor generation (NVG) and wall evaporation models. In the RELAP5 and MARS codes, the Savannah River Laboratory (SRL) model has been used as the subcooled boiling model for the past 20 years. In this study, the improved subcooled boiling model has been presented to replace the SRL model. To achieve this, extensive subcooled boiling experimental data performed for a vertical upward flow have been collected, and the SRL model has been assessed by comparing the collected experimental data with its MARS simulation results. As results, it was found that the SRL model cannot appropriately consider the effects of liquid velocity and hydraulic diameter on axial void fraction development and, the model causes the computational instability around the boundary between low- and high-velocity region due to the discontinuity of the SRL NVG correlation. To overcome the deficiencies, a new NVG model was developed based on the local Nusselt number for the laminar and turbulent flows of a single phase, and the SRL wall evaporation model is also modified using the collected experimental data which cover a wide range of thermal-hydraulic conditions with pressures ranging from 1.1 to 150 bar, heat fluxes of 97 to 2210 kW/m2, Pe of 3,600 to 371,300, and hydraulic diameters of 5.0 to 25.5 mm. The improved subcooled boiling model was implemented in the MARS code and, the modified code has been assessed against the collected experiments and, validated against integral effect test data for non-regression test. It was shown that the new model can successfully replace the SRL model.
목차
1. Introduction 12. Literature survey 62.1. Subcooled boiling models 62.2. Subcooled boiling experiments 153. Assessment of the SRL model using the MARS code 174. Improvement of the SRL model 284.1. Development of a new NVG model 284.2. Modification of the wall evaporation model 365. Assessment of the improved subcooled boiling model 375.1. Improvement of the deficiencies in Section 3 375.2. Quantitative assessment of the modified code 425.3. Non-regression tests 466. Conclusions 50List of References 52Appendices 56
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