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8th International Conference on Pumps and Fans, ICPF 2024

作者： Shen, Xiaobo Li, Rennian Han, Wei Yang, Shiqi Bai, Lu Yang, Tao School of Energy and Power Engineering Lanzhou University of Technology Gansu Province China Key Laboratory of Advanced Pumps Valves and Fluid Control System of the Ministry of Education Lanzhou University of Technology Gansu Province China

The conventional method of fixed boundaries for predicting erosion inadequately reflects the erosion characteristics of centrifugal pumps under realistic operating conditions. In this research, we employ the dynamic boundary method, considering the influence of changes in wall morphology due to erosion on the flow field. We utilize the Euler-Lagrange approach and the E/CRC erosion model, incorporating a dynamic boundary geometry reconstruction strategy, to predict the erosion characteristics of the IS80-50-315 single-stage single-suction centrifugal pump. Solid-liquid two-phase flow calculations are conducted on the pump to predict erosion characteristics under varied operating conditions. The results show that the dynamic boundary-based progressive erosion prediction method realistically forecasts the erosion characteristics of the overflow wall and captures the evolution of blade morphology with erosion time. Erosion intensity on the blade suction surface significantly surpasses that on the pressure surface, guided by particle distribution characteristics in the centrifugal pump flow channel. Particle diameter primarily influences the erosion position of centrifugal pump blades;smaller particles induce erosion in the middle region of the blade, while an increase in particle diameter shifts the severe erosion position towards the impeller outlet direction. At a consistent particle diameter, higher particle concentrations correspond to elevated erosion rates in the blade area. We establish a relationship between the blade mass loss rate and erosion time during 2500 hours of pump operation at the design condition, introducing the blade mass loss rate for convenient assessment and prediction of blade damage in the centrifugal pump. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Two phase flow

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Improving the ductility and toughness of nano-TiC/AZ61 composite by optimizing bimodal grain microstructure via extrusion speed

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Journal of Magnesium and Alloys 2024年第8期12卷 3264-3280页

作者： Lingling Fan Mingyang Zhou Wulve Lao Yuwenxi Zhang Hajo Dieringa Ying Zeng Yuanding Huang Gaofeng Quan Key Laboratory of Advanced Technologies of Materials Ministry of EducationChengdu 610031China School of Materials Science and Engineering Southwest Jiaotong UniversityChengdu 610031China Institute of Material and Process Design Helmholtz-Zentrum HereonGeesthacht 21502Germany Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of ChinaChengdu 610213China School of Civil Engineering Southwest Jiaotong UniversityChengdu 610031China Institute of Metallic Biomaterials Helmholtz-Zentrum HereonGeesthacht 21502Germany

In this study,the nano-TiC/AZ61 composites with different heterogeneous bimodal grain(HBG)structures and uniform structure are obtained by regulating the extrusion *** effect of HBG structure on the mechanical properties of the composites is *** increasing ductility and toughening mechanism of HBG magnesium matrix composites are carefully *** the extrusion speed increases from 0.75 mm/s to 2.5 mm/s or 3.5 mm/s,the microstructure transforms from uniform to HBG *** with Uniform-0.75 mm/s composite,Heterogeneous-3.5 mm/s composite achieves a 116.7%increase in ductility in the plastic deformation stage and almost no reduction in ultimate tensile *** is mainly because the lower plastic deformation inhomogeneity and higher strain hardening due to hetero-deformation induced(HDI)***,Heterogeneous-3.5 mm/s composite achieves a 108.3%increase in toughness compared with the Uniform-0.75 mm/s *** is mainly because coarse grain(CG)bands can capture and blunt cracks,thereby increasing the energy dissipation for crack propagation and improving *** addition,the CG band of the Heterogeneous-3.5 mm/s composite with larger grain size and lower dislocation density is more conducive to obtaining higher strain hardening and superior blunting crack ***,the increased ductility and toughness of the Heterogeneous-3.5 mm/s composite is more significant than that Heterogeneous-2.5 mm/s composite.

关键词： Nano-TiC/AZ61 composite Extrusion speed Heterogeneous bimodal grain structure Increasing ductility mechanism Toughening mechanism

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Study in Gas-Phase Agglomeration Characteristics of Spiral Flow Gas-Liquid Multiphase Pump 8

Study in Gas-Phase Agglomeration Characteristics of Spiral F...

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8th International Conference on Pumps and Fans, ICPF 2024

作者： Han, Wei Guo, Xuanchen Feng, Huiming He, Chunpei Zhang, Yukun Xie, Wenqi College of Energy and Power Engineering Lanzhou University of Technology Lanzhou730050 China Key Laboratory of Advanced Pumps Valves and Fluid Control System of the Ministry of Education Lanzhou University of Technology Lanzhou730050 China

The spiral flow gas-liquid mixed transport pump experiences gas phase accumulation in the impeller flow passage, leading to blockage and a decrease in pumping performance. To understand the rules and mechanisms of gas phase aggregation in the spiral flow gas-liquid mixed transport pump, numerical calculations based on the Eulerian multiphase flow model and SST k - ω turbulent flow model were conducted. The effects of different gas volume fractions, speeds, and liquid phase viscosities on the pump were explored, and the external characteristics, flow characteristics, and gas phase aggregation processes in the impeller were analysed for these three variables. The results indicate that the head and efficiency of the pump gradually decrease with increasing gas volume fraction and liquid phase viscosity, while they increase with increasing speed. When the liquid phase viscosity changes from pure water to 50 times its viscosity, the gas phase aggregation at the impeller outlet decreases, resulting in reduced pressure and a smaller vortex region. The relative gas phase aggregation degree λ decreases from 0.5 to almost 0. When the gas volume fraction increases from 20% to 60%, the gas phase aggregation at the impeller outlet increases, the pressure difference between the impeller hub and the rim increases, and the vortex region expands, leading to an increase in λ by 8 times. When the speed increases from 3000 rpm to 5000 rpm, the gas phase aggregation at the impeller outlet increases, the pressure increases, and the vortex region expands, resulting in a 16-fold increase in λ . © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Vortex flow

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NUMERICAL SIMULATION AND DROPLET BEHAVIOR ANALYSIS OF MICRO-CHANNEL DROPLET GENERATOR 30

NUMERICAL SIMULATION AND DROPLET BEHAVIOR ANALYSIS OF MICRO-...

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30th International Conference on Nuclear engineering, ICONE 2023

作者： Zhao, Yuan Guo, Jia Xie, Lin Zhao, Fulong Tan, Sichao Heilongjiang Provincial Key Laboratory of Nuclear Power System & Equipment Harbin Engineering University Harbin150001 China Key Laboratory of Nuclear Safety and Advanced Nuclear Energy Technology Harbin Engineering University Harbin150001 China

ISBN: (纸本)9784888982566

With the development large-scale space equipment becoming more and more obvious, its power consumption and waste heat generation increase, it is urgent to develop a higher efficient heat transfer system. Liquid droplet radiator (LDR) is a promising new space waste heat export system. LDR has many advantages compared with the existing technology, including small volume of droplet, large specific surface area, internal stability, and more compact storage in the space chamber. It is very important to study and improve the droplet generator that generates droplets, which generate micro-droplet. The rapid development of numerical simulation technology provides a more intuitive, effective and accurate help for predicting and analyzing multiphase flow in microfluidic channels, which is conducive to better research on the generation of droplets. In this study, a 2D model of droplet generator is designed by using VOF model. The droplet uniformity is studied by changing the inlet velocity and two phase surface tension. Breakup behavior and the diameter of droplet show that surface tension takes part in a important role. At the same time, the surface tension also has an impact on the droplet diameter, and when the surface tension reaches a certain threshold, the droplet will produce serious mutual merge. Increasing the jet velocity helps to slow this behavior. © 2023 by JSME.

关键词： Waste heat

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Strategies toward Highly Efficient Monolithic Perovskite/Organic Tandem Solar Cells

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Chinese Journal of Chemistry 2023年第14期41卷 1753-1768页

作者： Shan Jiang Zhiyang Xu Fuzhi Wang Shilei Tian Yang Wang Chenghao Li Zhan'ao Tan State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijing102206 China Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical TechnologyBeijing100029 China Department of Coal and Syngas Conversion Sinopec Research Institute of Petroleum ProcessingBeijing100083 China

Constructing monolithic tandem solar cells (TSCs) is an effective method to break the Shockley–Queisser (S–Q) radiative efficiency limit for single-junction solar cells. Employing the wide bandgap perovskite materials and low bandgap organic materials as absorber layers for front and rear subcells, respectively, to construct perovskite/organic TSCs can complementarily absorb sunlight in ultraviolet-visible (UV-Vis) range by front perovskite and near-infrared (NIR) range by rear organic molecules, thus reducing the thermalization energy losses. Besides the subcells, the interconnection layer (ICL), which physically and electrically connects the front and rear subcells, is also an important tunnel junction to recombine charges. In this review, we summarize the optimization strategies of wide bandgap perovskites for front subcell, narrow bandgap organic material for rear subcell, and the ICLs employed in monolithic perovskite/organic TSCs.

关键词： Perovskite solar cells Wide bandgap perovskite Low bandgap organic molecule Tandem solar cells Subcells Interconnection layer Efficiency Open-circuit voltage

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Deformation Mechanism of Bimodal Structured 2205 Duplex Stainless Steel in Two Yield Stages

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Journal of Wuhan University of Technology(Materials Science) 2023年第1期38卷 184-191页

作者：盛捷 DU Mingchen LI Yufeng MA Guocai CHEN Weiqian ZHENG Yuehong ZHAN Faqi REN Junqiang G I Raab 喇培清 State Key Laboratory of Gansu Advanced Non-Ferrous Metal Materials Lanzhou University of TechnologyLanzhou 730050China Jiuquan Iron and Steel(Group)Co. Ltd.Jiayuguan 735100China Key Laboratory of Solar Power System Engineering Jiuquan Vocational and Technical CollegeJiuquan 735000China Institute of Physics of Advanced Materials Ufa State Aviation Technical University12 K.Marx StreetUfa 450008Russia

A kind of micro/nanostructured 2205 duplex stainless steel(DSS)with uniform distribution of nanocrystals was prepared via aluminothermic reaction *** analysis of stress-strain curve showed that the fracture strength and elongation of the specimen were 946 MPa and 24.7%,*** present,the research on microstructure of bimodal 2205 DSS at room temperature(RT)mainly depended on scanning electron microscope(SEM)observation after loading *** test result indicates that there are two different yield stages in stress-strain curve of specimen during tensile *** microstructure of duplex bimodal structured stainless steel consists of two pairs of soft hard regions and *** studying deformation mechanism of bimodal structured stainless steel,the interaction between soft phase and hard phase are *** principle of composition design and microstructure control of typical duplex stainless steel is obtained,which provides an important research basis for designing of advanced duplex stainless steel.

关键词： 2205 duplex stainless steel bimodal structure in-situ tensile test deformation mechanism two different yield stages

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Circuit Model with Current Interruption for Hybrid High Voltage DC Circuit Breakers to Achieve Precise Current Experiments

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CSEE Journal of power and Energy systems 2022年第4期8卷 1250-1260页

作者： Zhonghao Dongye Lei Qi Bing Ji Xiaoguang Wei Xiang Cui State Key Laboratory of Altermate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijing 102206China School of Engineering University of LeicesterLE17RH LeicesterU.K State Key Laboratory of Advanced Power Transmission Technology Global Energy Interconection Research Institute Co.Ld.Beijing 102209China

The current interruption test based on an LC resonance circuit for hybrid DC circuit breakers(HVDC CBs)is widely employed to characterize the current interruption capability of *** order to ensure a high-fidelity replica of the fault current in a high voltage application,this paper first proposes an equivalent model of the test circuit,where not only parasitic resistances but also the threshold voltages and on-state resistances of various semiconductor devices are ***,the analytical formula of the test current is derived by including the working principle of the HVDC ***,the parameter extraction method,which combines finite element analysis and measurements by an impedance analyzer,is given in this *** extracted result implies that,in current interruption transients,equivalent resistances of 500 kV CB are as large as 535 mS,which have a significant influence on current ***,the 34 kV/25 kA current interruption test for the 500 kV CB is *** measured results are proved to be consistent with the analytical results obtained from the proposed model,and the relative error is less than 2%.

关键词： Current interruption test high voltage DC circuit breaker

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RESEARCH ON ACCIDENT PREDICTION OF NUCLEAR power PLANTS BASED ON DEEP LEARNING 31

RESEARCH ON ACCIDENT PREDICTION OF NUCLEAR POWER PLANTS BASE...

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2024 31st International Conference on Nuclear engineering, ICONE 2024

作者： Wei, Lv Tong, Li Bo, Wang Sichao, Tan Jiangkuan, Li Ruifeng, Tian Heilongjiang Provincial Key Laboratory of Nuclear Power System and Equipment College of Nuclear Science and Technology Harbin Engineering University Harbin150001 China Key Laboratory of Nuclear Safety and Advanced Nuclear Energy Technology School of Nuclear Science and Technology Harbin Engineering University Harbin150001 China

ISBN: (纸本)9780791888261

Based on the bidirectional long short-term memory network (BILSTM) and the long short-term memory network (LSTM), this paper uses the rolling update mechanism (RU) to obtain the time series training set data and test set data of the original data, and predicts the water level and pressure changes of the Pressurizer after the LOCA accident in nuclear power plants, so as to provide a certain reference for the prediction of LOCA accidents in nuclear power plants. Specifically, the following conclusions are obtained: Compared with the LSTM model, the BILSTM model has better prediction results and less prediction loss. Although the average error of the prediction results of the two models is 10-3 orders of magnitude, the average error of BILSTM is reduced by more than 20% compared with LSTM. © 2024 by ASME.

关键词： Nuclear reactor accidents

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Design,preparation,microstructure and mechanical property of the lightweight radiation-shielding Mg-Ta-Al composites basing differential temperature hot rolling

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Journal of Magnesium and Alloys 2024年第6期12卷 2433-2446页

作者： Wenbo Luo Songya Feng Xiuzhu Han Li Zhou Qinke Kong Zhiyong Xue Jianzhao Wang Mei Zhan Xianhua Chen Fusheng Pan Institute for Advanced Materials North China Electric Power UniversityBeijing 102206China Beijing Institute of Spacecraft System Engineering Beijing 100094China Sinosteel Equipment&Engineering Co Ltd.Beijing100080China State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization Inner Mongolia 014030China School of Materials Science Northwestern Polytechnical UniversityXi’an 710072China College of Materials Science and Engineering Chongqing UniversityChongqing 400045China

A novel lightweight,radiation-shielding Mg-Ta-Al layered metal-matrix composite(LMC)was successful designed by doping the extremely refractory metal(Ta)into Mg *** Mg-based LMCs sheets shows excellent radiation-dose shield effect,about 145 krad·a^(−1),which is about 17 times of traditional Mg alloy,while its surface density is only about 0.9 g·cm^(−2),reducing by 60%than that of pure *** quantitate relationship between radiation-dose and the materials’thickness was also confirmed to the logistic function when the surface density is in the range of 0.6-1.5 g·cm^(−2).Meantime,the rolling parameters,interface microstructure and mechanical properties in both as-rolled and annealing treated samples were *** sheets possess a special dissimilar atoms diffusion transitional zone containing an obvious inter-diffusion Mg-Al interface and the unique micro-corrugated Ta-Al interface,as well as a thin Al film with a thickness of about 10μ*** special zone could reduce the stress concentration and enhance the strength of Mg-Ta-Al *** interface bonding strength reaches up to 54-76 *** ultimate tensile strength(UTS)and yield strength(TYS)of the Mg-Ta-Al sheet were high to 413 MPa and 263 MPa,respectively,along with an elongation of 5.8%.The molecular dynamics(MD)analysis results show that the two interfaces exhibit different formation mechanism,the Mg-Al interface primarily depended on Mg/Al atoms diffusion basing point defects movement,while the Ta-Al interface with a micro-interlock pining shape formed by close-packed planes slipping during high temperature strain-induced deformation process.

关键词： Dissimilar metals composites Mg based alloys Radiation shielding Hot rolling Lightweight

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PREDICTION OF SENSOR DATA ACCURACY IN THERMAL EXPERIMENTAL BENCHES USING GRU-GCN NEURAL NETWORK MODEL 31

PREDICTION OF SENSOR DATA ACCURACY IN THERMAL EXPERIMENTAL B...

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2024 31st International Conference on Nuclear engineering, ICONE 2024

作者： Linjun, Yang Tong, Li Yongchao, Liu Bo, Wang Jiangkuan, Li Jiming, Wen Sichao, Tan Ruifeng, Tian Heilongjiang Provincial Key Laboratory of Nuclear Power System and Equipment College of Nuclear Science and Technology Harbin Engineering University Harbin150001 China Key Laboratory of Nuclear Safety and Advanced Nuclear Energy Technology School of Nuclear Science and Technology Harbin Engineering University Harbin150001 China

ISBN: (纸本)9780791888261

As a large-scale facility with multi-system coupling, the operation safety of nuclear power plant is of great importance to the environment and human society. Accurate monitoring of the overall operation status of nuclear power plants (NPP) is not only the key to ensure its safe operation, but also an important means to improve energy efficiency and reduce potential risks. In order to solve the problem of simultaneous prediction of multiple operating parameters of nuclear power plant, this study proposes a deep learning model combining Graph Convolution Network (GCN) and Gated Cycle Unit (GRU), which have the advantages of processing complex network data and time series data respectively. In order to verify the validity of the proposed model, a series of experiments are carried out on the thermal test-bed simulating the operation characteristics of nuclear power plants. The experimental results show that compared with the existing methods, GRU-GCN model has significantly improved the prediction accuracy. This result not only shows the potential of the deep learning model combining GCN and GRU in processing complex system data, but also provides a new idea for the safety monitoring and operation management of nuclear power plants in the future. © 2024 by ASME.

关键词： Nuclear power plants

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