Thermo-mechanical stress analysis of feed-water valves in nuclear power plants

Li, Wenqing; Zhao, Lei; Yang, Yue; Wu, Jiayi; Jin, Zhi-jiang; Qian, Jin-yuan

doi:10.1016/j.net.2021.09.018

Cited by 8 publications

(5 citation statements)

References 24 publications

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“…This result shows that the fuel valve has the "quick-opening characteristic" [20]; that is, at a small K value, the change in valve opening can cause the outlet gas flow rate to change quickly, and the response is sensitive to the realization of "quick-opening". With a large K value, the opening has little influence on the flow rate, and the stability of the gas pressure before the valve is the main factor affecting the flow rate at the outlet [21]. With a large opening, the outlet gas flow increases by 8% under the limit working condition of a 3.05 MPa inlet pressure.…”

Section: Discussionmentioning

confidence: 99%

A Thermal Fluid–Solid Coupling Simulation of Gas Fuel Control Valves for High-Precision Gas Turbines

Pan

Luo

et al. 2023

Aerospace

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Gas fuel control valves play important roles in the control of gas flow in high-precision gas turbines. To clarify the influence of coupling between the structure and the fluid system, a thermal fluid–solid coupling mechanism is presented based on numerical investigations carried out using a dynamic mesh technique. Valve core deformation can affect the outlet gas flow accuracy. At 2% valve opening, the gas temperature contributes 93% to the deformation. The effect of deformation on the flow accuracy at 6% valve opening and 4% valve opening is increased by 4.8% and 7.3%, respectively. The fluctuation range of the gas temperature and pressure in front of the valve should be strictly controlled to ensure the high precision and high stability of the outlet flow. These results help to clarify the processes that occur in the valve flow path, leading to the flow control instability observed in the control valve.

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Section: Discussionmentioning

confidence: 99%

A Thermal Fluid–Solid Coupling Simulation of Gas Fuel Control Valves for High-Precision Gas Turbines

Pan

Luo

et al. 2023

Aerospace

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“…Feed-Water Valves 52 (FWVs) control the flow of water through steam turbines. Valve bodies may be weakened by overheating and pressure.…”

Section: Approaches Concerning Theoretical Prediction Of Residual Str...mentioning

confidence: 99%

A Review on Thermal Modelling of Residual Stresses during Additive Manufacturing

N. Chethan Kumar,

Jhavar

2023

jmmf

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Additive Manufacturing (AM) has received interest since it is simpler to manufacture complicated 3D component without the requirement for casting moulds than convective fabrication. AM has a lot of significance in fields like aerospace, medicine, and more to make parts of any kind of complex shape. Since the finished products are subjected to repeated cycles of heating and cooling, there will always be some residual stresses present in them. During layer-over-layer deposition, the large difference in temperature between the layers causes residual stresses, which hurt the performance of the products. As far as the author’s knowledge, there is no thorough review of the thermal modelling of residual stress in AM. In this review paper, the goal is to first get a good understanding of how residual stresses are developed, and then to look at how different models measure them. So, residual stresses can be seen as a key factor in controlling costs, performance, and quality standards of the finished component. This paper does a thorough review of the field to give engineers and researchers up-to-date information and advice about residual stresses.

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“…The application of the multiway valve directly decreases the number and length of pipes, which greatly upgrades the efficiency of the whole system. However, since the temperature of the coolant in different loops of the multiway valve is not consistent during operation, the temperature difference inevitably induces heat conduction from high-temperature coolant to low-temperature coolant through the valve body [8], resulting in heat transfer loss in the valve. On the other hand, multiway valves generally possess more intricate flow channel configurations than traditional valves.…”

Section: Introductionmentioning

confidence: 99%

Flow Loss Analysis and Structural Optimization of Multiway Valves for Integrated Thermal Management Systems in Electric Vehicles

Zheng

Wei

2023

Energies

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The multiway valve is the core component of the integrated thermal management system in an electric vehicle, and its heat transfer loss and pressure loss significantly impact the performance of the whole thermal management system. In this paper, heat transfer loss and pressure loss in multiway valves are investigated using three-dimensional unsteady numerical simulations. Heat transfer loss and pressure loss under different operating modes are revealed, and relationships between pressure loss and mass flow rate, inlet temperature, and valve materials are studied. The results show that the significant temperature gradient around the control shaft results in heat transfer loss and pressure loss mainly occurs around the junction of the control shaft and the shell, where the flow direction changes sharply. The pressure loss is nonlinearly and positively correlated with the mass flow rate. Furthermore, the main geometric parameters of the pipeline and the control shaft are optimized. The pressure loss firstly increases and then decreases, with the increasing curvature of the inner walls of the pipe corners in four flow channels. Compared with the structural optimization at the pipe corners, increasing the curvature of the inner wall of the control shaft and the shell corners reduces pressure loss continuously. Moreover, this study obtains an optimal structure with minimum pressure loss using coupled structure optimization at the control shaft and shell corners.

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Thermo-mechanical stress analysis of feed-water valves in nuclear power plants

Cited by 8 publications

References 24 publications

A Thermal Fluid–Solid Coupling Simulation of Gas Fuel Control Valves for High-Precision Gas Turbines

A Thermal Fluid–Solid Coupling Simulation of Gas Fuel Control Valves for High-Precision Gas Turbines

A Review on Thermal Modelling of Residual Stresses during Additive Manufacturing

Flow Loss Analysis and Structural Optimization of Multiway Valves for Integrated Thermal Management Systems in Electric Vehicles

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