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23rd Pacific Basin Nuclear Conference, PBNC 2022

作者： Hu, Peizheng Xu, Zhen Wang, Junlong Tong, Lili Cao, Xuewu School of Mechanical Engineering Shanghai Jiao Tong University Shanghai China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Sichuan Chengdu China

ISBN: (纸本)9789811988981

The containment spray system is widely used in pressurized water reactor nuclear power plants, which can not only remove the heat in the containment but also remove the fission products suspended in the containment to reduce the discharge of radioactive substances to the environment during accident conditions. The aerosol removal behavior is affected by the spray droplet size distribution. The effect of different spray flow rates on aerosol removal is studied experimentally, and an improved evaluation model is established based on the spray droplet size distribution to analyze the efficiency of removal mechanisms. The experiments are carried out in the CATH (Containment Aerosol Thermal-Hydraulics) test facility with a total volume of 18.5 m3, where aerosols are injected and scrubbed by spray droplets. The spray droplets are generated by a full-cone spray nozzle at the volume flow rate of 0.4 m3/h and 0.6 m3/h, where droplet size distribution is measured by a Laser Diffractometer. Polydisperse particles of TiO2 are used to simulate the solid aerosol, whose diameters are in the range of 0.2 ~ 1.6 μm measured with an Aerosol Spectrometer. Experimental results show that the removal efficiency is higher for the larger particles, and the global removal efficiency of aerosols improved with the increase of spray flow rate from 0.4 to 0.6 m3/h. In addition, the removal efficiency of inertial impaction, interception, Brownian diffusion are quantitatively evaluated by the improved model, which shows that the effect of inertial impaction and interception is more significant for large particles. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Aerosols

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Physics-based battery SOC estimation methods:Recent advances and future perspectives

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Journal of Energy Chemistry 2024年第2期89卷 27-40,I0003页

作者： Longxing Wu Zhiqiang Lyu Zebo Huang Chao Zhang Changyin Wei College of Mechanical Engineering Anhui Science and Technology UniversityChuzhou 233100AnhuiChina Hubei Key Laboratory of Power System Design and Test for Electrical Vehicle Hubei University of Arts and ScienceXiangyang 441053HubeiChina School of Internet Anhui UniversityHefei 230039AnhuiChina School of Mechanical and Electrical Engineering Guilin University of Electronic TechnologyGuilin 541004GuangxiChina

The reliable prediction of state of charge(SOC)is one of the vital functions of advanced battery management system(BMS),which has great significance towards safe operation of electric *** far,the empirical model-based and data-driven-based SOC estimation methods of lithium-ion batteries have been comprehensively discussed and reviewed in various ***,few reviews involving SOC estimation focused on electrochemical mechanism,which gives physical explanations to SOC and becomes most attractive candidate for advanced *** this reason,this paper comprehensively surveys on physics-based SOC algorithms applied in advanced ***,the research progresses of physical SOC estimation methods for lithium-ion batteries are thoroughly discussed and corresponding evaluation criteria are carefully ***,future perspectives of the current researches on physics-based battery SOC estimation are *** insights stated in this paper are expected to catalyze the development and application of the physics-based advanced BMS algorithms.

关键词： Lithium-ion batteries State of charge Electrochemical model Battery management system

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reactor Containment Passive Safety Analysis: Steam Condensation in Presence of Non-condensable Gas Scaled Experiment and Modeling

Reactor Containment Passive Safety Analysis: Steam Condensat...

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2024 Pacific Basin Nuclear Conference, PBNC 2024

作者： Bhowmik, Palash K. Schlegel, Joshua P. Sabharwall, Piyush Division of Reactor System Design and Analysis Idaho National Laboratory Idaho FallsID United States Department of Nuclear Engineering and Radiation Science Missouri University of Science and Technology RollaMO United States

ISBN: (纸本)9798331307653

This study presents steam condensation scaled experiments and semi-empirical models in presence of nitrogen (N)—a noncondensable gas (NCG), simulating air in the reactor containment—to support water-cooled small modular reactors (SMRs) passive containment cooling system (PCCS) design and analysis. Previous experimental studies on PCCS are focused on fixed and smaller tube (mostly 2-in.) geometries and specific test condition variations, bringing challenges with geometric scaling and mismatching with SMR prototypic design. To address these challenges, this study presents steam condensation test dataset obtained from three scaled test sections of 1-, 2-, and 4-in.-diameter steam condensers with an annular/ jacket cooling of 2-, 3-, and 6 in.-diameter tubes, respectively. Test data were collected for steam ranges from 58 to 63 kg/hr., and NCG flow of to 13.3 kg/hr. Annular cooling water flow was varied to obtain required testing conditions of saturated steam 4.4 inlet and fully condensed outlet. Axial temperature test data of bulk cooling water, steam and condensate were collected by thermocouples for three test sections and various steam-NCG mixing/testing conditions. A standard data reduction method was adopted—utilizing iterative and nodalized mass and heat transfer calculation—to estimate axial local heat fluxes, heat transfer coefficients (HTCs), condensation rates, film thickness, and Nusselt number. Based on the obtained dataset semi-empirical model results—a ratio of experimental and Nusselt’s theoretical HTC are presented. Such results and findings are supportive of developing scaled-up testing facility, to model validations and accelerate next generation of reactors development and deployment. © 2024 Pacific Basin Nuclear Conference, PBNC 2024. All rights reserved.

关键词： Thermocouples

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Multi-Level Robotic Pouring Using Offline Reinforcement Learning

Multi-Level Robotic Pouring Using Offline Reinforcement Lear...

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2024 IEEE International Conference on Robotics and Biomimetics, ROBIO 2024

作者： Zhang, Xiaoxiong Liu, Junwei Zhang, Wei School of System Design and Intelligent Manufacturing Southern University of Science and Technology Shenzhen Key Laboratory of Control Theory and Intelligent Systems Shenzhen518055 China

ISBN: (纸本)9781665481090

This paper presents a novel learning-based method for a robotic manipulator to achieve liquid pouring across different liquid levels using only visual sensors. Previous works have relied on either online reinforcement learning or imitation learning, which are limited by sim-to-real gaps or data efficiency. In this paper, we propose to combine supervised learning and offline reinforcement learning, utilizing a human demonstration dataset containing only successful pouring at the highest level. Specifically, our approach employs supervised learning for a visual classifier, transforming the visual input into a categorical distribution over liquid levels. The offline reinforcement learning method is applied to a binary-conditioned control policy, which takes a binary signal and the robot's proprioception as inputs to determine the action. The binary signal indicates whether the desired liquid level has been reached based on the target liquid level. Through experiments, our method demonstrates superior effectiveness compared to a state-of-the-art imitation learning algorithm. Moreover, tests in unseen scenarios and multiple liquid level commands verify the generalization and transferability of our approach. © 2024 IEEE.

关键词： Self-supervised learning

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Research and design on the Control Rod Drive Mechanism Power Supply and Control Strategy for the Nuclear Power Plants Based on Silicon-Controlled Rectifier

Research and Design on the Control Rod Drive Mechanism Power...

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International Conference on Power Electronics and Motion Control (IPEMC)

作者： A. Mingzhou Xu B. Gao Zheng C. Zerun Zhao D. Ping Yang E. Yusheng Peng Science and Technology on Reactor System Design Technology Laboratory China Southwest Jiaotong University China

ISBN: (数字)9798350351330

ISBN: (纸本)9798350351347

Due to the characteristics of large output current ripple and long current rise and fall times in the current rod control power supply basedsilicon-controlled rectifier, a decoupling nonlinear adaptive control is *** proposed control strategy can improve the rod control power supply of the speed of respond and the steady-state current accuracy. Practical application has shown that this method solves the output current ripple and the rise and fall time of the current, meeting the working requirements of rod control power supply in nuclear power plants.

关键词： Accuracy Power supplies Conferences Asia Rectifiers Power electronics Steady-state

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Skeleton-Based Volumetric Parameterizations for Lattice Structures

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Computer Modeling in Engineering & sciences 2023年第4期135卷 687-709页

作者： Long Chen Shuxun Liang Nan Yan Xiangqian Yang Baotong Li School of Mechanical Engineering University of Shanghai for Science and TechnologyShanghai200093China School of Optical-Electrical and Computer Engineering University of Shanghai for Science and TechnologyShanghai200093China Key Laboratory of EducationMinistry for Modern Design&Rotor-Bearing System Xi’an Jiaotong UniversityXi’an710049China

Lattice structures with excellent physical properties have attracted great research *** this paper,a novel volume parametric modeling method based on the skeleton model is proposed for the construction of threedimensional lattice *** skeleton model is divided into three types of *** the corresponding algorithms are utilized to construct diverse types of volume parametric *** unit-cell is assembled with distinct nodes according to the geometric *** final lattice structure is created by the periodic arrangement of *** different types of volume parametric lattice structures are constructed to prove the stability and applicability of the proposed *** quality is assessed in terms of the value of the Jacobian ***,the volume parametric lattice structures are tested with the isogeometric analysis to verify the feasibility of integration of modeling and simulation.

关键词： Lattice structure volumetric parameterization skeleton model node modeling

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Effect of Different Laser Energy Nitriding on the Fretting Wear Performance of Zr Alloy

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摩擦学学报（中英文） 2024年第9期44卷 1306-1321页

作者： NING Chuangming TANG Guocan YU Shijia ZHOU Junbo REN Quanyao ZENG Bing CAI Zhenbing Key Laboratory of Advanced Technologies of Materials Tribology Research InstituteSouthwest Jiaotong UniversitySichuan Chengdu 610031China School of Mechanical and Electrical Engineering Chengdu University of TechnologySichuan Chengdu 610031China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of ChinaSichuan Chengdu 610213China

The zirconium(Zr)alloy fuel cladding is one of the key structural components of a nuclear reactor and the first and most important line of defense for accommodating fission *** the operation of nuclear reactors,Zr alloy fuel cladding is subjected to extreme harsh environments,such as high temperature,high pressure and high flow rate for a long period of *** wear and corrosion resistance of Zr alloys is important for the safe operation of nuclear *** modification can effectively improve the corrosion and wear resistance of fuel *** with coating technology,nitriding technology does not have problems for bonding between the coating and the *** research on surface nitriding of Zr alloys mainly focuses on plasma nitriding and ion implantation *** on laser nitriding of Zr alloy surfaces and their fretting wear characteristics is *** this study,the surface of Zr alloy was treated with laser nitriding at different laser *** microstructure of Zr alloy treated with different laser energies and its fretting wear performance were *** results showed that after nitriding with different laser energies,the surface of the Zr alloy showed a typical molten state after melting,vaporizing and cooling under the thermal effect of the laser,and this state was more obvious with the increase of the laser *** the same time,doping of N atoms and formation of the ZrN phase led to different cooling rates in the molten zone that produced large tensile stresses after *** led to cracks on the surface of Zr alloys after laser nitriding at different energies,and the crack density increased with increasing laser *** also led to an increase in the surface roughness of the Zr alloy with increasing laser energy after laser nitriding *** to the presence of water in the industrial nitrogen,nitrides were generated on the surface of the sample along with some *** the laser

关键词： zirconium alloy fretting wear laser nitriding delamination laser energy

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Modelling Analysis of Non-uniform Flow and Heat Transfer in Parallel Rectangular Channels During Flow Blockage Condition 23rd

Modelling Analysis of Non-uniform Flow and Heat Transfer in ...

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23rd Pacific Basin Nuclear Conference, PBNC 2022

作者： Chen, Jiayue Chen, Huandong Wang, Xiaoyu Wang, Zefeng Sino-French Institute of Nuclear Engineering and Technology Sun Yat-Sen University Zhuhai610213 China Science and Technology On Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610213 China

ISBN: (纸本)9789811987793

In order to establish the non-uniform flow and heat transfer modelling method in parallel rectangular channels, as an additional technique and tool for safety analysis of plate-type fuel, one dimensional two-fluid model coupled with two-dimensional heat conduction of fuel are used to develop a special code for non-uniform flow and heat transfer simulation during flow blockage condition. The flow distribution and fuel temperature field are obtained under different blockage conditions. The two-dimensional heat conduction model are testes under four different power distributions. The simulation results show that mass flow and heat transfer between parallel channels would redistribute after blockage. And the two-dimensional heat conduction model predicted more uniform temperature profile of fuel plate cross-section. Thus, the modelling method used in this paper can be used in the parallel rectangular channels prediction in non-uniformly flow and heat transfer phenomenon. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Two phase flow

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Study on the operating characteristics of Stirling engine based on an optimized analysis method

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Nuclear science and Techniques 2025年第9期36卷 1-17页

作者： Yang, Shang-Dong Feng, Wen-Pei Ma, Yu-Gao Gu, Zhi-Xing College of Nuclear Technology and Automation Engineering Chengdu University of Technology Chengdu China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu China

The Stirling engine, as a closed-cycle power machine, exhibits excellent emission characteristics and broad energy adaptability. Second-order analysis methods are extensively used during the foundational design and thermodynamic examination of Stirling engines, owing to their commendable model precision and remarkable efficiency. To scrutinize the effect of Stirling engine design parameters on the cyclical work output and efficiency, this study formulates a series of differential equations for the Stirling cycle by employing second-order analysis methods, subsequently augmenting the predictive accuracy by integrating considerations of loss mechanisms. In addition, an iterative method for the convergence of the average pressure was introduced. The predictive capability of the established model was validated using GPU-3 and RE-1000 experimental data. According to the model, parameters such as the operational fluid, porosity of the regenerator, and diameter of the wire mesh and their influence on the resulting work output and cyclic efficiency of the Stirling engine were analyzed, thereby facilitating a broader understanding of the engine’s functional characteristics. These findings suggest that hydrogen, owing to its lower dynamic viscosity coefficient, can provide superior output power. The loss due to flow resistance tends to increase with the rotational speed. Additionally, under conditions of elevated rotational speed, the loss from flow resistance declines in cases of increased porosity, and the enhancement of the porosity to diminish flow resistance losses can boost both the output work and the cyclic efficiency of the engine. As the porosity increased further, the hydraulic diameter and dead volume in the regenerator continued to expand, causing the pressure drop within the engine to become the dominant factor in the gradual reduction of output power. Furthermore, extending the length of the regenerator results in a decrease in the output work, although the the

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Molecular transport under extreme confinement

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science China(Physics,Mechanics & Astronomy) 2022年第6期65卷 1-10页

作者： FengChao Wang JianHao Qian JingCun Fan JinChuan Li HengYu Xu HengAn Wu CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern MechanicsCAS Center for Excellence in Complex System MechanicsUniversity of Science and Technology of ChinaHefei 230027China

Mass transport through the nanoporous medium is ubiquitous in nature and *** the macroscale transport phenomena which have been well understood by the theory of continuum mechanics,the relevant physics and mechanics on the nanoscale transport still remain *** developments in fabrication of slit-like nanocapillaries with precise dimensions and atomically smooth surfaces have promoted the fundamental research on the molecular transport under extreme *** this review,we summarized the contemporary progress in the study of confined molecular transport of water,ions and gases,based on both experiments and molecular dynamics *** liquid exhibits a pronounced layered structure that extends over several intermolecular distances from the solid surface,which has a substantial influence on static properties and transport behaviors under *** studies have also shown that those molecular details could provide some new understanding on the century-old classical theory in this field.

关键词： confined mass transport nanocapillary solid-liquid interface confinement effect

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