한국압력기기공학회 논문집 (Transactions of the Korean Society of Pressure Vessels and Piping)

한국압력기기공학회 (Korean Society of Pressure Vessels and Piping)
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초음속 증기제트의 충돌하중 특성에 대한 수치해석 연구

Numerical Analysis on the Characteristics of Supersonic Steam Jet Impingement Load

  • 투고 : 2018.08.24
  • 심사 : 2018.09.27
  • 발행 : 2018.12.30
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초록

Structures, systems and components of nuclear power plants should be able to maintain safety even in the event of design-basis accidents such as high-energy line breaks. The high-pressure steam jet ejected from the broken pipe may cause damage to the adjacent structures. The ANSI/ANS 58.2 code has been adopted as a technical standard for evaluating the jet impingement load. Recently, the U.S. NRC pointed out the non-conservativeness of the ANSI/ANS 58.2, because it does not take into account the blast wave effect, dynamic behavior of the jet, and oversimplifies the shape and load characteristics of the supersonic steam jet. Therefore, it is necessary to improve the evaluation method for the high-energy line break accident. In order to evaluate the behavior of supersonic steam jet, an appropriate numerical analysis technique considering compressible flow effect is needed. In this study, numerical analysis methodology for evaluating supersonic jet impingement load was developed and verified. In addition, the conservativeness of the ANSI/ANS 58.2 model was investigated using the numerical analysis methodology. It is estimated that the ANSI jet model does not sufficiently reflect the physical behavior of under-expanded supersonic steam jet and evaluates the jet impingement load lower than CFD analysis result at certain positions.

키워드

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Fig. 1 Typical structure of supersonic free-jet(7)

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Fig. 2 Qualitative behavior of critical mass flux

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Fig. 3 Contour of Mach number (Free jet, test 5)

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Fig. 4 Free jet test comparison

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Fig. 5 Contour of Mach number (Impinging jet, test 11)

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Fig. 6 Impinging jet test comparison

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Fig. 7 Contour of Mach number

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Fig. 8 Pressure distribution along jet centerline

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Fig. 9 Contour of Mach number (P0=10 bar)

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Fig. 10 Radial distribution of impinging pressure (P0=10 bar)

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Fig. 11 Impinging pressure at center of target plate(P0=10 bar)

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Fig. 12 Impinging force acting on the target plate(P0=10 bar)

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Fig. 13 Contour of Mach number (=44 bar)

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Fig. 14 Radial distribution of impinging pressure (P0=44 bar)

HGHRB5_2018_v14n2_1_f0015.png 이미지

Fig. 15 Impinging pressure at center of target plate (P0=44 bar)

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Fig. 16 Impinging force acting on the target plate (P0=44 bar)

참고문헌

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  2. Choi, C., Oh, S., Choi, D. K., Kim, W. T., Chang, Y. and Kim, S. H., 2016, "CFD Analysis for Steam Jet Impingement Evaluation," Trans. of the KPVP, Vol. 12, No. 2, pp. 58-65.
  3. ANS, 1998, "Design Basis for Protection of Light Water Nuclear Power Plants against the Effects of Postulated Pipe Rupture," ANSI/ANS-58.2-1988(W1998).
  4. Wallis, G., 2004, The ANSI/ANS Standard 58.2-1988: Two Phase Jet Model.
  5. Ransom., V., 2004, Comments on GSI-191 Models for Debris Generation.
  6. USNRC, 2007, "Determination of Rupture Locations and Dynamics Effects Associated with the Postulated Rupture of Piping(Rev.2)," U.S. Nuclear Regulatory Commission, Washington, D.C., NUREG-0800.
  7. Kim, H. and Shin, H., 1994, "Numerical Study on Under-Expanded Jets through a Supersonic Nozzle (II)," Trans. of the KSME(B), Vol. 20, No. 6, pp.1994-2004.
  8. Krothapalli, A., Hsia, Y. Baganoff, D. and Karamcheti, K., 1986, "The Role of Screech Tones in Mixing of an Underexpanded Rectangular Jet," J. Sound Vib., Vol. 106, No. 1, pp.119-143. https://doi.org/10.1016/S0022-460X(86)80177-8
  9. ANSYS, Inc., 2010, ANSYS Fluent User Guide.
  10. KAERI, 1993, "A State-of-the-Art Report on Two-Phase Critical Flow Modeling," Korea Atomic Energy Research Institute, KAERI/AR-377/93.
  11. Johnson, R. W., 1998, The Handbook of Fluid Dynamics, Springer, pp.17-32 - 17-33.
  12. Healzer, J. M. and Elias, E., 1986, "Two-Phase Jet Modeling and Data Comparison," Electric Power Research Institute, Palo Alto, CA, EPRI NP-4362.