Evaluation Charts of Thermal Stresses in Cylindrical Vessels Induced by Thermal Stratification of Contained Fluid

Furuhashi, Ichiro; Kawasaki, Nobuchika; Kasahara, Naoto

doi:10.1299/jcst.2.547

Cited by 5 publications

(6 citation statements)

References 3 publications

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“…The cylindrical shell theory, which is used in the previous work [2], is a theory that estimates the thermal stress in a thin cylinder caused by an axisymmetric load. This method evaluates thermal stress based on the temperature difference and the thickness of the thermal stratification.…”

Section: Summary Of the Previous Methodsmentioning

confidence: 99%

“…In the modification of the thermal stress analysis, a bending stress model with unsteady thermal conduction through the wall thickness, an effect of edge and an effect of the stress concentration due to the flow hole are taken into account based on the previous simplified thermal stress analysis [2].…”

Section: Modification Of the Thermal Stress Analysismentioning

confidence: 99%

“…However, a detail coupling of them requires much computational cost. As for a thermal stress analysis caused by the thermal stratification, a simplified model has been proposed [2]. However, a steady-state temperature distribution is taken into account and bending stresses caused by temperature distribution across a wall thickness are not considered in the previous model.…”

Section: Introductionmentioning

confidence: 99%

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Numerical study on structural integrity of inner barrel caused by thermal stratification in upper plenum of Monju

Kodama

Takata

Yamaguchi

2015

Journal of Nuclear Science and Technology

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In Japanese prototype fast reactor, Monju, an inner barrel with several flow holes is placed at an upper plenum adjacent to a core outlet. When the reactor scram occurs, a cold coolant flows into the bottom of the upper plenum through the core outlet and thermal stratification will appear at the upper plenum. And thus, the inner barrel may be damaged by a thermal stress due to thermal stratification. In this study, a structural integrity assessment method is developed based on fluid-structure interaction analysis and cumulative damage rule. First, a three-dimensional thermal-hydraulics analysis is conducted to simulate a turbine trip test from 40% power operation. Full power output conditions are also simulated by modifying conditions of 40% power output conditions. Next, the thermal stress analysis is modified by adding a practical condition, such as a bending stress. Then, the thermal stress is calculated at each location of the inner barrel. Finally, cumulative damage is evaluated by using the present method. It is concluded that a main factor of cumulative damage is a stress near flow holes that causes stress concentration. It is also found that thermal transient within several hundred seconds after the reactor scram is an important factor.

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Section: Summary Of the Previous Methodsmentioning

confidence: 99%

Section: Modification Of the Thermal Stress Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical study on structural integrity of inner barrel caused by thermal stratification in upper plenum of Monju

Kodama

Takata

Yamaguchi

2015

Journal of Nuclear Science and Technology

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“…They are necessary to simulate properly the bending behavior of cylindrical vessels containing a highly stratified axial fluid temperature [10,11]. A time step of 1 hour is used.…”

Section: Tank Wall Modelmentioning

confidence: 99%

“…The torsion phenomenon caused by large axial temperature gradients generates a wave-perturbation in hoop and vertical stress, as it is illustrated in [10,11]. Therefore, vertical stress might be present although there is not a restriction of vertical displacement.…”

Section: Thermoelastic Stressesmentioning

confidence: 99%

Dynamic Thermoelastic Analysis of Thermocline-like Storage Tanks

et al. 2015

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Thermocline storage system is considered as a cheaper alternative to the common two-tank molten salt approach. However, its configuration and performance might lead to a catastrophic structural failure known as thermal ratcheting. It may occur when a tank filled with particulate solids is cyclically heated and cooled. This paper aims at studying the transient evolution of thermocline tank wall stresses, taking into account both thermal and mechanical loads. A complete numerical methodology to deal with the fluid-structure interaction problem, based on a thermoelastic model for the shell, is used. For validation purposes and getting better understanding of the stress-strain response of the structure, Solar One Pilot Plant thermocline case is reproduced. Although some experimental data obtained from the literature suffers of large uncertainty, the numerical results show consistent good agreement.

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Thermo-mechanical parametric analysis of packed-bed thermocline energy storage tanks

et al. 2016

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© 2016. This version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/A packed-bed thermocline tank represents a proved cheaper thermal energy storage for concentrated solar power plants compared with the commonly-built two-tank system. However, its implementation has been stopped mainly due to the vessel’s thermal ratcheting concern, which would compromise its structural integrity. In order to have a better understanding of the commercial viability of thermocline approach, regarding energetic effectiveness and structural reliability, a new numerical simulation platform has been developed. The model dynamically solves and couples all the significant components of the subsystem, being able to evaluate its thermal and mechanical response over plant normal operation. The filler material is considered as a cohesionless bulk solid with thermal expansion. For the stresses on the tank wall the general thermoelastic theory is used. First, the numerical model is validated with the Solar One thermocline case, and then a parametric analysis is carried out by settling this storage technology in two real plants with a temperature rise of 100 °C and 275 °C. The numerical results show a better storage performance together with the lowest temperature difference, but both options achieve suitable structural factors of safety with a proper design.Peer ReviewedPostprint (author's final draft

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Evaluation Charts of Thermal Stresses in Cylindrical Vessels Induced by Thermal Stratification of Contained Fluid

Cited by 5 publications

References 3 publications

Numerical study on structural integrity of inner barrel caused by thermal stratification in upper plenum of Monju

Numerical study on structural integrity of inner barrel caused by thermal stratification in upper plenum of Monju

Dynamic Thermoelastic Analysis of Thermocline-like Storage Tanks

Thermo-mechanical parametric analysis of packed-bed thermocline energy storage tanks

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