Research Progress of Reactor Thermal-Hydraulic Characteristics Under Ocean Conditions in China

Xiao, Jie

doi:10.3389/fenrg.2020.593362

Cited by 7 publications

(3 citation statements)

References 39 publications

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“…Floating nuclear power plants are the best solutions for ocean energy supply problems as they can provide continuous, reliable, and efficient power to offshore oil exploitation platforms, remote islands, as well as for seawater desalination (Buongiorno et al, 2016;Jie, 2020). Helical coil once-through steam generators (OTSG) as the key components of small nuclear power plants are featured with compact structure, high heat transfer efficiency, and tolerance of thermal expansion stress (Yao et al, 2021a).…”

Section: Introductionmentioning

confidence: 99%

Numerical study on flow characteristics in the primary side of a once-through steam generator under ocean conditions

Chen,

Lu,

Gao

et al. 2024

Front. Energy Res.

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The flow characteristics of the primary side of the helical coil once-through steam generator (OTSG) have a significant impact on the safe operation of the reactor. Different from the land-based stationary working conditions, the flow of the primary side of the OTSG is influenced by sea waves and winds under ocean conditions. The rigid body motion model is used to calculate the flow of the primary side under different ocean conditions, including heeling, trimming, rolling, pitching, heaving, and combined conditions. The results show that under heeling and trimming conditions, the static pressure of the primary side is different from that under vertical conditions due to the influence of gravity, but its impact on the flow field is relatively small. Under rolling and pitching conditions, the mean flow velocity and pressure drop change periodically with the movement of the OTSG, and the smaller the sway angle, the smaller the variation amplitude of the mean flow velocity and pressure drop. Under the heaving condition, the variation amplitude of the mean flow velocity is greater than that under rolling and pitching conditions, and reverse flow occurs. Under the combined heaving and rolling condition, the mean flow velocity and pressure drop are influenced by the period and amplitude of both the two motions.

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Section: Introductionmentioning

confidence: 99%

Numerical study on flow characteristics in the primary side of a once-through steam generator under ocean conditions

Chen,

Lu,

Gao

et al. 2024

Front. Energy Res.

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“…Numerous studies have been conducted on thermal hydraulics for reactors in the ocean environment [1][2][3][4]. Recently, there have been several review papers on the thermal-hydraulic properties of reactors in oceanic environments [3][4][5]. Especially the flow heat transfer and instability issues, since these are important for system safety and dependability.…”

Section: Introductionmentioning

confidence: 99%

Study on the Density Wave Instability in Natural Circulation System under Rolling Conditions

Gong

Zhang

Gui

et al. 2023

International Journal of Energy Research

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In the ocean environment, the thermal fluid system installed on the ship moves with the waves. This unsteady transient motion imposes additional body forces on the liquid. Thereby, the thermohydraulic properties of the thermal fluid system are changed, especially for natural circulation systems with a low driving force. Flow instability related to system security is a common two-phase flow system phenomenon. It is an essential subject in the study of thermal-hydraulic characteristics. In this paper, the density wave instability in a low-pressure natural circulation system with several parallel heating channels in the circumstances of rolling motion is studied by PNCMC (Program for Natural Circulation under Motion Condition). PNCMC is a newly developed program by adding extra body force induced by ship motions in two-phase’s momentum equations. The mechanism of rolling motion and its impact on flow oscillation and unstable boundary power are investigated. The supercooled boiling caused by the higher surface heat flux firstly promotes the occurrence of density wave oscillations between parallel heating channels. When enough steam enters the riser, the system density wave oscillation occurs under the gravity pressure drop-flow rate-vapor fraction feedback. A more complicated compound oscillation is created by superimposing the interchannel oscillation and the system density wave oscillation. If the rolling motion has little change to the natural circulation flow, when density wave instability arises, the flux oscillation rule and the instability boundary power are basically consistent with the vertical conditions. When the rolling angle is large, the fairly large amplitude flow oscillation generated by rolling will prevent density wave instability from occurring and force the flow oscillation to obey the law of rolling effects.

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“…As a consequence, the flow rate and the pressure drop of the coolant system fluctuate, which leads to a significant change in flow field and natural circulation, and may even have deleterious effect on the reactor performance (Iyori et al, 1987;Pendyala et al, 2008;Zhang et al, 2009). Previous studies have shown that these additional motions will affect the flow and heat transfer characteristics of reactor coolant (Ishida et al, 1990;Du and Zhang, 2012;Jie, 2020). Overall, the effect of additional motion can be divided into two aspects: one is to change the natural circulation characteristics of the reactor system, resulting in large fluctuation of flow rate (Hiroyuki et al, 2002;Ishida and Yoritsune, 2002;Gong et al, 2014); the other is to change the coolant flow field in the core to form a coolant stagnation zone and a countercurrent zone in the core (Murata et al, 2012;Gong et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Full-Scale Three-Dimensional Fluid Flow in an Oscillating Reactor

Gong

2021

Front. Energy Res.

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Marine reactors are subjected to additional motions due to ocean conditions. These additional motions will cause large fluctuation of flow rate and change the coolant flow field, making the system unstable. Therefore, in order to understand the effect of oscillating motion on the flow characteristics, a numerical simulation of fluid flow is carried out based on a full-scale three-dimensional oscillating marine reactor. In this study, the resistance coefficients of the lattice, rod buddle and steam generator are fitted, and the distribution of flow rate, velocity as well as pressure in different regions is investigated through the standard model. After additional oscillation is introduced, the flow field in an oscillating reactor is presented and the effect of oscillating angle and elevation on the flow rate is investigated. Results show that the oscillating motion can greatly change the flow field in the reactor; most of the coolant circulates in the downcommer and lower head with only a small amount of coolant entering the core; the flow fluctuation period is consistent with the oscillating period, and the flow variation patterns under different oscillating conditions are basically the same; since the flow amplitude is related to oscillating speed, the amplitude of flow rate rises when decreasing the maximum oscillating angle; the oscillating elevation has little effect on the flow rate.

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Research Progress of Reactor Thermal-Hydraulic Characteristics Under Ocean Conditions in China

Cited by 7 publications

References 39 publications

Numerical study on flow characteristics in the primary side of a once-through steam generator under ocean conditions

Numerical study on flow characteristics in the primary side of a once-through steam generator under ocean conditions

Study on the Density Wave Instability in Natural Circulation System under Rolling Conditions

Numerical Simulation of Full-Scale Three-Dimensional Fluid Flow in an Oscillating Reactor

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