Lifetime evaluation of cracked shaft sleeve of reactor coolant pump under thermal striping

Young, Lih-Jier

doi:10.1016/s0020-7683(01)00116-0

Cited by 6 publications

(5 citation statements)

References 4 publications

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“…It is worth emphasizing that Figure 26 corresponds to the cumulated value of the hydraulic losses between the origin x = 0 and a given x location. A dramatic increase in the hydraulic loss is observed in the canned motor parts (2) and 3and the latter part of (7) and (8) (x/x max = (0.03, 0.23), (0.87, 1)). However, the increase in the hydraulic loss in the canned motor parts (1), (4), (5), and (6) is slower than the previous parts.…”

Section: Local Hydraulic Loss Analysismentioning

confidence: 97%

“…Generally, shaft forces in similar canned motors are calculated either from empirical formulae of material mechanics or integrated directly from the pressure distribution on the shaft surfaces by computational fluid dynamics (CFD) simulation. Young 2 analyzed the integrity and lifespan of a shaft sleeve based on fracture mechanics, subject to surface temperature fluctuation. Zhang et al 3 investigated a propeller shaft system using Hamilton's principle in conjunction with the finite element method.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of shaft forces in a vertical canned motor through local hydraulic loss analysis

Guo

Liu

Tang

et al. 2018

Advances in Mechanical Engineering

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In order to improve the stability and the lifespan of rotating components in a canned motor of a centrifugal pump, a local hydraulic loss analysis has been performed based on detailed flow field analysis by Reynolds-averaged Navier-Stokesbased re-normalization group k-e turbulence model simulation. An energy balance equation was applied to analyze the local hydraulic loss distribution. The stator flow channel in the motor was modeled as a porous medium, by utilizing the Ergun equation. Due to the complex structure and the velocity gradient in the complicated flow field, a strong circulation flow exists in the thrust bearing outer ring. Moreover, circumferentially asymmetric Taylor vortices in the vicinity of the hydrodynamic bearing and unsymmetrical Taylor vortices in the transitional region after the thrust bearing were predicted. Dean vortices in the distributary pipes are also captured. These complex vortices are accompanied with high dissipations. A strong increase in hydraulic losses are observed in the corresponding canned motor parts (x/x max = (0.03, 0.23), (0.87, 1)). Moreover, a strong increase in the radial force and the axial force are predicted in the relative parts of canned motor (x/x max = (0.84, 0.97), x/x max = (0.24, 0.17), (0.84, 0.97), respectively).

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Section: Local Hydraulic Loss Analysismentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Evaluation of shaft forces in a vertical canned motor through local hydraulic loss analysis

Guo

Liu

Tang

et al. 2018

Advances in Mechanical Engineering

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“…However, the fatigue fracture fractography may not be exactly alike due to variance in the materials, loads and environmental mediums. For example, the thermal fatigue is generally represented by the multi-source, secondary crack or fatigue sidestep [3][4][5][6] . As the mechanical fatigue fracture with the different load types, sizes and degrees of stress concentration, the position of the fatigue crack initiation, area of the stable extension zone as well as the beach shape will also go through changes [7][8][9] .…”

Section: Introductionmentioning

confidence: 99%

Analysis of Failure Mode and Construction Improvement of Spray Tubes in Boiler Desuperheater

Chen

Shen

Zheng³

et al. 2013

AMM

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With macrographic examination, SEM observation and fracture quantitative analysis technology, the fracture fractography of a spray tube with both the mechanical stress and the thermal stress in a boiler desuperheater of a power plant was interpreted, and the failure mode and the cause were researched. Results showed that rupture of the spray tube was due to the fatigue, and further, the thermal mechanical fatigue. The alternating bending stress and thermal stress were main factors of the fracture failure. The shallow surface thermal fatigue cracks in tube inner wall were induced by thermal stress. When the thermal mechanical fatigue crack grew up steadily to the shallow surface cracks zone, fast growth occurred and the local fast fracture zone generated which had different fractographies with final fast fracture zone of the normal fatigue fracture.

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“…Prediction of thermal fatigue in mixing tees is a challenging subject that is needed for life cycle management of nuclear power plant piping systems. Thermal striping is one phenomenon that has been identified as a cause of thermal fatigue failures [2,3]. Thermal striping characterizes the phenomenon where hot and cold fluid mixing results in temperature fluctuations of the mixing fluids near a wall.…”

Section: Introductionmentioning

confidence: 99%

Large-eddy simulations (LES) of temperature fluctuations in a mixing tee with/without a porous medium

Lü

Jiang

Guo

et al. 2010

International Journal of Heat and Mass Transfer

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Lifetime evaluation of cracked shaft sleeve of reactor coolant pump under thermal striping

Cited by 6 publications

References 4 publications

Evaluation of shaft forces in a vertical canned motor through local hydraulic loss analysis

Evaluation of shaft forces in a vertical canned motor through local hydraulic loss analysis

Analysis of Failure Mode and Construction Improvement of Spray Tubes in Boiler Desuperheater

Large-eddy simulations (LES) of temperature fluctuations in a mixing tee with/without a porous medium

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