지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학위논문
- 저자정보
- 지도교수
- 최상헌
- 발행연도
- 2023
- 저작권
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Acoustic-induced vibration in piping system leads to premature wear and failure of
the system and equipments. If a vortex shedding frequency due to the dead-end pipe
branch is overlapped with a pipe natural frequency, the magnitude of the amplitude is
increased, allowing for a fatigue failure. This paper has investigated computational
fluid dynamics (CFD) based assessment to predict the vortex shedding frequencies of
the Main steam Atmosphere Dump Valve (MSADV) and the Main Steam Safety Valve (MSSV)
in the main steam line of nuclear power plants. The CFD-based evaluation method has
been validated by measuring the vibration of the branch pipe under the 100% power
operation of the nuclear power plant, as well as by reviewing the deviation from the
evaluation result. The major vibration frequencies were predicted to be 171.4 Hz and
185.7 Hz in the MSADV branch pipe and four MSSV branch pipes of the main steam piping
through CFD analysis. The major vibration frequencies from the vibration measurements
were found to be 172.8 Hz and 193.2 Hz, showing a difference of approximately 3.9%
between the CFD analysis and measurement results. It is concluded that the difference
between the design drawings and the actual installation, as well as differences in
vibration measurement location and method, may have caused the discrepancy.
Therefore, reducing the discrepancy between the modeled and actual installed pipe
shapes, and minimizing the difference between the monitoring location in the CFD
analysis and the actual measurement location, would lead to a decrease in the
discrepancy between the analysis and measurement results.
the system and equipments. If a vortex shedding frequency due to the dead-end pipe
branch is overlapped with a pipe natural frequency, the magnitude of the amplitude is
increased, allowing for a fatigue failure. This paper has investigated computational
fluid dynamics (CFD) based assessment to predict the vortex shedding frequencies of
the Main steam Atmosphere Dump Valve (MSADV) and the Main Steam Safety Valve (MSSV)
in the main steam line of nuclear power plants. The CFD-based evaluation method has
been validated by measuring the vibration of the branch pipe under the 100% power
operation of the nuclear power plant, as well as by reviewing the deviation from the
evaluation result. The major vibration frequencies were predicted to be 171.4 Hz and
185.7 Hz in the MSADV branch pipe and four MSSV branch pipes of the main steam piping
through CFD analysis. The major vibration frequencies from the vibration measurements
were found to be 172.8 Hz and 193.2 Hz, showing a difference of approximately 3.9%
between the CFD analysis and measurement results. It is concluded that the difference
between the design drawings and the actual installation, as well as differences in
vibration measurement location and method, may have caused the discrepancy.
Therefore, reducing the discrepancy between the modeled and actual installed pipe
shapes, and minimizing the difference between the monitoring location in the CFD
analysis and the actual measurement location, would lead to a decrease in the
discrepancy between the analysis and measurement results.
목차
Ⅰ. 서론 1Ⅱ. CFD 해석 32.1 CFD 해석 절차 32.2 CFD 해석 모델 생성 42.3 격자 생성 52.4 CFD 경계조건 및 해석 72.5 CFD 해석 결과 10Ⅲ. 실험 측정 183.1 측정 위치 선정 및 측정 183.2 측정 결과 183.3 측정 결과 분석 22Ⅳ. CFD 해석 결과와 측정 결과 비교 244.1 CFD 해석 결과와 측정 결과 비교 244.2 CFD 해석 결과와 측정 결과 편차 발생 요인 분석 27Ⅴ. 결론 28참고문헌 29
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