Icone19-43569 Study on Flow Induced Vibration Evaluation for a Large Scale JSFR Piping : (4) Unsteady Flow Characteristics in 1/10 Scale Hot-Leg Piping Experiments Under Undeveloped and Swirl Inflow Conditions

Iwamoto, Yukiharu; Kondo, Manabu; Yasuda, Kazunori; Sogo, Motosuke; Tanaka, Masaaki; Yamano, Hidemasa

doi:10.1299/jsmeicone.2011.19._icone1943_233

Cited by 4 publications

(4 citation statements)

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“…The dependency on the basic computational meshes are confirmed with the grid convergence index (GCI) referring to ASME V&V (ASME, 2009) as described in Appendix B. In addition, applicability of the present CFD calculation method to flow field evaluation is validated comparing with experimental data obtained in elbows (Iwamoto et al, 2011) as described in Appendix C.…”

Section: Cfd Calculationsmentioning

confidence: 59%

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Prediction of flow-accelerated corrosion in single/dual elbow in pipelines considering geometric parameters and layout effect

Yoneda

Uchiyama

Morita

et al. 2023

Mechanical Engineering Journal

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Flow-accelerated corrosion (FAC) is the major pipe wall thinning phenomenon to be managed for its potential of catastrophic pipe rupture. Present management rule for pipe wall thinning in Japanese nuclear power plants is based on pipe wall thickness measurements resulting in large number of measurements in each plant. For future improvement of the plant management in Japan, introduction of prediction method or prediction code for thinning rate and residual lifetime evaluation is expected. To predict the maximum wall thinning rate or minimum wall thickness efficiently for each pipe component, one-dimensionally along the pipelines, relative wall thinning trend of each component type, "geometry factor", combined with the effect of upstream component, "declining effect", are essential, which are both derived from hydraulic features. In this study, the geometry factor and the declining effect for pipeline elbows are evaluated considering specific geometric parameters through series of computational fluid dynamics calculations. For the geometry factor, correlation equation is arranged as a function of curvature radius and bending angle of elbows, showing evident effect of each geometric parameter. And for the declining effect, firstly, the effect of plane angle formed by the upstream and downstream elbows is evaluated that the in-plane configuration with the flow streaming forward would be the most conservative condition. Then, based on the in-plane configuration, correlation equation for the declining effect is arranged as a function of the distance between the two elbows. It is found that even when the distance is very short, the remaining portion of the upstream effect on the downstream elbow would be much less than previous knowledge which may improve the overprediction in proximate condition. By implementing these correlations into author's FAC prediction model, residual wall thickness of plant pipe elbows is shown to be predicted mostly within 20 % from the measured data.

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Section: Cfd Calculationsmentioning

confidence: 59%

“…The applicability of the present CFD calculation method to flow field evaluation is validated comparing with experimental data obtained in elbows by Iwamoto et al (2011). Calculation meshes are created with the same concept as described in chapter 2.3.…”

Section: Appendix A: Number Of Pipe Components Counted In Pwr Plantsmentioning

confidence: 98%

Prediction of flow-accelerated corrosion in single/dual elbow in pipelines considering geometric parameters and layout effect

Yoneda

Uchiyama

Morita

et al. 2023

Mechanical Engineering Journal

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“…The test section was fabricated as 1/3-scaled model of the JSFR hot-leg piping as shown in Fig.1 (b) and diameter of the test section was of 0.41 m. The maximum mean velocity in the experiment was 9.2 m/s which corresponded to that in the operation condition of the JSFR. Iwamoto et al, (3,32) also measured the pressure loss coefficient in 2x10 4 <Re<3.2x10 5 and the axial velocity profiles of water flow with the LDV. The short-elbow pipe test section with diameter of 0.125 m was fabricated as 1/10-scaled model of the JSFR hot-leg piping.…”

Section: Existing Studies For Pipe Elbow Flowmentioning

confidence: 99%

“…The oncoming streams on both sides collided in the inner wall side region and collision point periodically swayed from side to side from moment to moment. Yuki et al(21) and Iwamoto et al(3) suggested such an unsteady swing motion of the secondary flow in downstream of the elbow by the water experiment. In the inner region (r/D<-0.25), the local acceleration of axial flow and the axial velocity fluctuation intensity as shown in Figs.…”

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confidence: 94%

Numerical Investigation on Large Scale Eddy Structure in Unsteady Pipe Elbow Flow at High Reynolds Number Conditions with Large Eddy Simulation Approach

Tanaka

Ohshima

2012

JPES

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Flow induced vibration in primary cooling system of the Japan Sodium cooled Fast Reactor (JSFR) has been investigated. The primary cooling system consists of a large diameter pipe and a pipe elbow with short curvature radius corresponding to its diameter (short-elbow). Flow-induced vibration by flow through the short-elbow is an important issue in design study of the JSFR, because it may affect to structural integrity of the piping. In this paper, numerical simulations for several pipe elbows with different pipe diameters and curvature radii in literature were conducted at Reynolds number conditions from Re=500 to 1.47x10 7 to investigate unsteady flow behavior through the short-elbow, including validation study of an in-house LES code (MUGTHES). Numerical results in each condition were compared with the experimental results in literature. Unsteady flow characteristics and pressure fluctuation generation mechanism in the short-elbow were clarified in relation to the large-scale eddy motion.

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LDV Flow Measurement of a Deflected Inflow Using a 1/10-Scale Hot-Log Piping Test Facility of a Primary Circuit Hot-Leg Piping in a Sodium-Cooled Fast Reactor

Iwamoto

Kondo

Ogawa³

et al. 2012

Trans.JSME, Ser.B

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Icone19-43569 Study on Flow Induced Vibration Evaluation for a Large Scale JSFR Piping : (4) Unsteady Flow Characteristics in 1/10 Scale Hot-Leg Piping Experiments Under Undeveloped and Swirl Inflow Conditions

Cited by 4 publications

References 0 publications

Prediction of flow-accelerated corrosion in single/dual elbow in pipelines considering geometric parameters and layout effect

Prediction of flow-accelerated corrosion in single/dual elbow in pipelines considering geometric parameters and layout effect

Numerical Investigation on Large Scale Eddy Structure in Unsteady Pipe Elbow Flow at High Reynolds Number Conditions with Large Eddy Simulation Approach

LDV Flow Measurement of a Deflected Inflow Using a 1/10-Scale Hot-Log Piping Test Facility of a Primary Circuit Hot-Leg Piping in a Sodium-Cooled Fast Reactor

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