Development of flow-induced vibration evaluation methodology for large-diameter piping with elbow in Japan sodium-cooled fast reactor

Yamano, Hidemasa; Tanaka, Masaaki; Kimura, Nobutada; Ohshima, Hiroyuki; Kamide, Hideki; Watanabe, Osamu

doi:10.1016/j.nucengdes.2011.06.005

Cited by 19 publications

(10 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This Strouhal number was in good agreement with separately measured velocity data by Kawamura et al (6) , who indicated periodic turbulence with about 0.5 of Strouhal number in the downstream from the elbow. In normalizing the pressure-fluctuation PSDs, the experiments indicated no dependence on velocity and viscosity (water temperature), (7) which agreed with the experimental data obtained by Kawamura et al (6) , who reported no effect of Reynolds number (from 5 × 10 4 to 10 6 ) on the power spectra of turbulence.…”

Section: Introductionsupporting

confidence: 88%

“…This U-RANS simulation technique would be applied to development of a simulation-based flow-induced vibration evaluation methodology. (7) These results shown in this paper reveal that the flow pattern and overall pressure fluctuation PSDs can be basically simulated by the U-RANS approach. Given that the pressure fluctuation PSDs are important for the flow-induced vibration, further improvement for the amplitude of pressure fluctuation is necessary.…”

Section: Analytical Resultssupporting

confidence: 53%

See 1 more Smart Citation

Effect of Swirl Inflow on Flow Pattern and Pressure Fluctuation onto a Single-Elbow Pipe in Japan Sodium-Cooled Fast Reactor

Yamano

Sago

Hirota

et al. 2012

JFST

Self Cite

View full text Add to dashboard Cite

As part of the development of a flow-induced vibration evaluation methodology for the primary cooling piping in Japan sodium-cooled fast reactor, important factors were discussed in evaluating the flow-induced vibration for the hot-leg piping. To investigate a complex flow near the inlet of the hot-leg piping, a steady-state numerical analysis was carried out for the reactor upper plenum flow, which was simulated in a 1/10-scale reactor upper plenum experiment. Based on this analysis, experimental conditions on swirl inflow and deflected inflow that were identified as important factors were determined for flow-induced vibration experiments simulating only the hot-leg piping. In this study, the effect of the swirl inflow on flow pattern and pressure fluctuation onto the pipe wall was investigated in a 1/3-scale hot-leg pipe experiment. The experiment has indicated less significant for the pressure fluctuations, while the flow separation region was slightly influenced by the swirl inflow. Computational fluid dynamics simulation with a U-RANS approach results also appear in this paper. Through the simulations under the swirl inflow conditions of 0% and 5%, the validity of the U-RANS simulation was confirmed by comparison to the 1/3-scale hot-leg piping experiments.

show abstract

Section: Introductionsupporting

confidence: 88%

Section: Analytical Resultssupporting

confidence: 53%

Effect of Swirl Inflow on Flow Pattern and Pressure Fluctuation onto a Single-Elbow Pipe in Japan Sodium-Cooled Fast Reactor

Yamano

Sago

Hirota

et al. 2012

JFST

Self Cite

View full text Add to dashboard Cite

show abstract

“…7. The figure includes results for R e = 3.2 × 10 5 , 5.0 × 10 5 and of the 1/3 scale model (Yamano, et al, 2011). Fig.…”

Section: Experimental Methodsmentioning

confidence: 99%

Unsteady wall pressure characteristics of a 90 degree elbow in high Reynolds numbers

Iwamoto

Yamano

2014

JFST

Self Cite

View full text Add to dashboard Cite

“…In the present work, the vibration of a pipe induced by internal turbulent flow will be studied experimentally. Predictive models such as the transfer matrix method (TMM) for threedimensional pipes [55] with bends and elastic constraints [56], the eliminated-element Galerkin method for natural frequency analysis [57], the vibration evaluation method for large-diameter piping with an elbow [58], the structural impedance method [59] and Glimm's method for transient analysis of piping systems containing fluid flows [60] are outside the scope of the current work and are only mentioned here for reference purposes.…”

Section: The Development Of Tbl Induced Vibrationmentioning

confidence: 99%

In-Situ Modal Response Characterization of Pipe Structures Through Reynolds Number Variation

Chen

Hugo

Park

2018

Volume 3: Operations, Monitoring, and Maintenance; Materials and Joining

View full text Add to dashboard Cite

The modal response characterization of structures is a proven and reliable technique used to monitor system behavior and change, providing information for condition assessment and damage identification. In traditional modal response characterization procedures, an external mass excitation source is used to excite the system, and this is modeled as an impact function. This provides system forcing across a broad range of frequencies. In this investigation, an in-situ method of system excitation is explored. The modal characteristics of externally-supported pipe structures are investigated by varying the flow Reynolds number (Red). Given the increase in flow turbulence with Reynolds number, hydrodynamic pressure fluctuations on the pipe wall provide a varying excitation source. This removes the requirement for an external excitation source. A comparative analysis of data sets collected for both Acrylic and ABS pipe material show similar pressure spectra, while vibration spectra change significantly. Pressure spectra reveal a character whereby the spectral energy increases with increasing Reynolds number. A comparison of in-situ results to those obtained using traditional impact response tests show that vibration spectra collected through Reynolds number variation successfully capture the modal characteristics of the pipe-structure.

show abstract

Development of flow-induced vibration evaluation methodology for large-diameter piping with elbow in Japan sodium-cooled fast reactor

Cited by 19 publications

References 8 publications

Effect of Swirl Inflow on Flow Pattern and Pressure Fluctuation onto a Single-Elbow Pipe in Japan Sodium-Cooled Fast Reactor

Effect of Swirl Inflow on Flow Pattern and Pressure Fluctuation onto a Single-Elbow Pipe in Japan Sodium-Cooled Fast Reactor

Unsteady wall pressure characteristics of a 90 degree elbow in high Reynolds numbers

In-Situ Modal Response Characterization of Pipe Structures Through Reynolds Number Variation

Contact Info

Product

Resources

About