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논문 기본 정보

자료유형
학술저널
저자정보
저널정보
한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제42권 제4호
발행연도
2010.1
수록면
382 - 393 (12page)

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Thermal mixing by steam jets in a pool is dominantly influenced by a turbulent water jet generated by the condensing steam jets, and the proper prediction of this turbulent jet behavior is critical for the pool mixing analysis. A turbulent jet flow induced by a steam jet discharged through a vertical upward single hole into a subcooled water pool was subjected to computational fluid dynamics (CFD) analysis. Based on the small-scale test data derived under a horizontal steam discharging condition, this analysis was performed to validate a CFD method of analysis previously developed for condensing jet-induced pool mixing phenomena. In previous validation work, the CFD results and the test data for a limited range of radial and axial directions were compared in terms of profiles of the turbulent jet velocity and temperature. Furthermore, the behavior of the turbulent jet induced by the steam jet through a horizontal single hole in a subcooled water pool failed to show the exact axisymmetric flow pattern with regards to an overall pool mixing, whereas the CFD analysis was done with an axisymmetric grid model. Therefore, another new small-scale test was conducted under a vertical upward steam discharging condition. The purpose of this test was to generate the velocity and temperature profiles of the turbulent jet by expanding the measurement ranges from the jet center to a location at about 5% of Um and 10 cm to 30 cm from the exit of the discharge nozzle. The results of the new CFD analysis show that the recommended CFD model of the high turbulent intensity of 40% for the turbulent jet and the fine mesh grid model can accurately predict the test results within an error rate of about 10%. In this work, the turbulent jet model, which is used to simply predict the temperature and velocity profiles along the axial and radial directions by means of the empirical correlations and Tollmien’s theory was improved on the basis of the new test data. The results validate the CFD model of analysis. Furthermore, the turbulent jet model developed in this study can be used to analyze pool thermal mixing when an ellipsoidal steam jet is discharged under a high steam mass flux in a subcooled water pool.
#Steam Jet #Turbulent Jet #CFD #Pool Thermal Mixing

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참고문헌 (17)

참고문헌 신청
ANSYS Inc. / 2008 / CFX-11 Manual google schola Adrian Bejan / 1995 / Convection Heat Transfer, 2nd / John Wiley & Sons, Inc. google schola C.-H. SONG / 2009 / OECD/NEA Experts’ Activities on the Application of CFD Codes to Nuclear Reactor Safety Problems: Issues and Future Direction / Trans. the Korean Nuclear Societ google schola C.-H. Song / 1998 / Characterization of Direct Contact Condensation of Steam Jets Discharging into a Subcooled Water / IAEA Technical Committee Meeting google schola C.-H. Song / 2006 / Development of the PIRT for Thermal Mixing Phenomena in the APR1400 IRWST / 5th Korea-Japan Symposium on Nuclear Thermal-Hydraulics and Safety (NTHAS5) google schola

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