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A data-enabled physics-informed neural network with comprehensive numerical study on solving neutron diffusion eigenvalue problems

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arXiv

arXiv 2022年

作者： Yang, Yu Gong, Helin Zhang, Shiquan Yang, Qihong Chen, Zhang He, Qiaolin Li, Qing ParisTech Elite Institute of Technology Shanghai Jiao Tong University Shanghai200240 China School of Mathematics Sichuan University Chengdu610065 China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610041 China

We put forward a data-enabled physics-informed neural network (DEPINN) with comprehensive numerical study for solving industrial scale neutron diffusion eigenvalue problems (NDEPs). In order to achieve an engineering acceptable accuracy for complex engineering problems, a very small amount of prior data from physical experiments are suggested to be used, to improve the accuracy and efficiency of training. We design an adaptive optimization procedure with Adam and LBFGS to accelerate the convergence in the training stage. We discuss the effect of different physical parameters, sampling techniques, loss function allocation and the generalization performance of the proposed DEPINN model for solving complex eigenvalue problems. The feasibility of proposed DEPINN model is verified on three typical benchmark problems, from simple geometry to complex geometry, and from mono-energetic equation to two-group equations. Numerous numerical results show that DEPINN can efficiently solve NDEPs with an appropriate optimization procedure. The proposed DEPINN can be generalized for other input parameter settings once its structure been trained. This work confirms the possibility of DEPINN for practical engineering applications in nuclear reactor physics. Copyright © 2022, The Authors. All rights reserved.

关键词： Eigenvalues and eigenfunctions

A Data-Enabled Physics-Informed Neural Network with Comprehensive Numerical Study on Solving Neutron Diffusion Eigenvalue Problems

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SSRN 2022年

We present a data-enabled physics-informed neural network (DEPINN) with comprehensive numerical study for solving industrial scale neutron diffusion eigenvalue problems (NDEPs). In order to achieve an engineering acceptable accuracy for complex engineering problems, a small amount of prior data from physical experiments are suggested to be used, to improve the accuracy and efficiency. We design an adaptive optimization procedure with Adam and LBFGS to accelerate the convergence. We discuss the effect of different physical parameters, sampling techniques, loss function allocation and the generalization performance of the proposed DEPINN model for solving complex problem. The feasibility of proposed DEPINN model is tested on three typical benchmark problems, from simple geometry to complex geometry, and from mono-energetic equation to two-group equations. The proposed DEPINN can be generalized for other input parameter settings once its structure been trained. This work confirms the possibility of DEPINN for practical engineering applications in nuclear reactor physics. © 2022, The Authors. All rights reserved.

关键词： Eigenvalues and eigenfunctions

Facility Layout in Horizontal Cylindrical Space Based on Adaptive Gradient Descent Algorithm

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Facility Layout in Horizontal Cylindrical Space Based on Ada...

第40届中国控制会议

作者： Peng Yuan Yiran Miao Deqing Huang Junkai Hao Na Qin School of Electrical Engineering Southwest Jiaotong University Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China

FLP（Facility layout problem） is a common problem in engineering field. The past research tend to focus on the twodimensional space and a small amount of three-dimensional box space as well as vertical cylinder space. The FLP in horizontal cylinder space is less researched. Lots of FLP of box space and vertical cylinder space can transform to FLP of two-dimensional space easily, however, the FLP of horizontal cylinder space need design special calculation method of overlap constraint and boundary constraint. This paper designed the calculation method of overlap constraint and boundary constraint, used adaptive gradient descent algorithm with heuristic strategy to optimize the facility layout in horizontal cylinder space. On this basis,added symmetry constraint, absolute height constraint and relative distance constraint to close to the real engineering *** experiment results confirm the feasible of proposed scheme.

关键词： facility layout problem horizontal cylinder space gradient descent algorithm

Experimental study of heat transfer characteristics of bent high-temperature heat pipe

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International Journal of Thermal sciences 2025年 217卷

作者： Zhipeng Zhang Meng Xue Yugao Ma Kailun Guo Shuhua Ding Chenglong Wang Xiaoming Chai Wenxi Tian Suizheng Qiu Guanghui Su Department of Nuclear Science and Technology Xi'an Jiaotong University Xi'an China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu China

The heat pipe, as a highly efficient heat transfer element, is well adapted to industrial applications with high heat flux. For compact system designs and compatibility with energy converters, bent high-temperature heat pipes are essential. However, the current research on the bending effect of heat pipes mainly focuses on the medium and low-temperature range, and there is a lack of systematic experiments on the heat transfer characteristics of bent high-temperature heat pipes. In this study, high-temperature sodium heat pipes were used as experimental objects, and the bend radius, wick structure type, bend position and bend number were set as variables to examine the changes in heat transfer characteristics of high-temperature heat pipes before and after bending by utilizing the axial temperature distribution, thermal resistance and heat transfer limit. High-temperature heat pipes exhibit performance degradation after bending, with increased thermal resistance and reduced heat transfer limits, significantly influenced by bend radius and wick structure. A bend radius of 250 mm raises temperatures by 40 °C and reduces the heat transfer limit by 10.48 %. Screen wick types show better resistance to bending with less than 10 % performance loss, while artery types deteriorate by 35.21 %. Bend position also affects performance; a lower bend position has better results. The performance of the heat pipe is not significantly degraded by the double bends and the bends near the evaporation section are the main cause of the degradation.

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Experimental study of thermal and hydraulic characteristics of pressurizertype heating container during blowdown process

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Experimental study of thermal and hydraulic characteristics ...

2020 International Conference on Nuclear Engineering, ICONE 2020, collocated with the ASME 2020 Power Conference

作者： Ke, Bingzheng Gao, Puzhen Wang, Bo Chen, Bowen Li, Ru Tian, Ruifeng Cheng, Kun Lu, Chuan Fundamental Science on Nuclear Safety and Simulation Technology Laboratory Harbin Engineering University Harbin China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu China

ISBN: (纸本)9780791883785

Blowdown process is an important process in LOCA. Studying the internal thermal hydraulic characteristics of the pressurizer during LOCA blowdown process can help to accurately analyze the process of the whole LOCA, which is of great significance to reduce the hazard of accidents and improve the safety of nuclear power plants. An experiment system of blowdown process under low pressure conditions is built, and it uses a pressure gauge and a differential pressure level gauge to measure the pressure and liquid level in the pressurizer-type heating container, and uses a thermocouple to measure the temperature in the pressurizer-type heating container at different heights and distances from the centerline. The changes of pressure, liquid level and temperature characteristics during the blowdown process were obtained. The research results show that the higher the heating power, the greater the slope of pressure change in the heating container, and the pressure changes from negative to positive growth;The greater the heating power is, the faster the liquid level decreases, and the liquid level decreases sharply after the blowdown inflection point. The greater the heating power is, the greater the rate of temperature change, from negative growth to positive growth. The temperature change rate after the blowdown inflection point is reduced. As the height increases, the temperature inside the container first increases and then decreases;the further away from the container's centerline, the higher the measured temperature. © 2020 American Society of Mechanical Engineers (ASME). All rights reserved.

关键词： Containers

Experimental Study on the Characteristics of Annular Fluid Film in a Locally Deformed Narrow Rectangular Channel

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SSRN 2024年

作者： Wang, Fenze Ren, Quanyao Liu, Haidong Xiao, Yi Chen, Deqi Key Laboratory of Low-grade Energy Utilization Technologies and Systems Chongqing University Ministry of Education Chongqing400044 China Department of Nuclear Engineering and Technology School of Energy and Power Engineering Chongqing University Chongqing400044 China Science and Technology on Reactor System Design Technology Laboratory Chengdu610041 China Liangjiang International College Chongqing University of Technology Chongqing401135 China Chongqing Research Institute of HIT Chongqing401151 China School of Flight Technology Civil Aviation Flight University of China Sichuan618307 China China

The study of the characteristics of the annular flow film in the narrow rectangular channel under the localized deformation can provide a research basis for the heat and mass transfer and the hydrodynamic characteristics of the locally deformed narrow flow channel. In this study, the annular flow liquid film characterization experiments are carried out in a narrow rectangular channel without local deformation, ellipsoidal deformation and pillow-shaped deformation, and different annular flow liquid film parameters liquid film thickness, disturbance wave height, and disturbance wave wavelength are obtained by high-speed camera acquisition system and intelligent image processing technology. Analyze the effects of flow conditions and local deformation on the liquid film parameters of each annular flow. Local deformation impact factor functions for liquid film thickness, disturbance wave height, and disturbance wave wavelength are obtained. The error of the impact factor function is within ±30%. © 2024, The Authors. All rights reserved.

关键词： Liquid films

Experimental Study on the Characteristics of Annular Fluid Film in a Locally Deformed Narrow Rectangular Channel

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SSRN 2024年

The local deformation of plate fuel assembly due to neutron irradiation will lead to the deterioration of heat transfer in the flow channel. Studying the characteristics of annular flow films in narrow rectangular channels under localized deformation provides a foundation for understanding the heat and mass transfer and the hydrodynamic characteristics of the locally deformed narrow flow channel. In this study, the annular flow liquid film characterization experiments were conducted in a narrow rectangular channel under three conditions: no local deformation, ellipsoidal deformation, and pillow-shaped deformation. Various parameters of the annular flow liquid films, including liquid film thickness, disturbance wave height, and disturbance wave wavelength, were obtained using a high-speed camera acquisition system and advanced image processing techniques. The effects of flow conditions and local deformation on the liquid film parameters of each annular flow were analyzed. As the radial size of the local deformation increases relative to the liquid film thickness, the viscous bottom layer of the liquid film disintegrates, resulting in a reduction of the total liquid film thickness. When the gas-phase velocity is low, the local deformation exerts a greater shear force on the disturbance wave, prolonging the action time and increasing the likelihood of wave disintegration. Under conditions of no channel deformation, the disturbance wave wavelength is negatively correlated with the gas-phase velocity;conversely, under localized channel deformation, the wavelength is positively correlated with the gas-phase velocity. Thus, the effect of localized deformation on wavelength is bidirectional. Local deformation impact factor functions for liquid film thickness, disturbance wave height, and disturbance wave wavelength have been derived, with the error of these impact factor functions maintained within ±30%. © 2024, The Authors. All rights reserved.

关键词： Neutron irradiation

Synthetic subnanochannels in porous aromatic frameworks accelerate selective water permeation in membrane desalination

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science China Materials 2022年第7期65卷 1920-1928页

作者： Lei Wang Panpan Zhang Kaikai Chen Junchao Dong Feng Luo Qinglin Huang Zhixia Sun Xiaoqin Zou Guangshan Zhu Key Laboratory of Polyoxometalate and Reticular Material Chemistry of Ministry of Education Faculty of ChemistryNortheast Normal UniversityChangchun 130024China Institute of Chemical and Industrial Bioengineering Jilin Engineering Normal UniversityChangchun 130052China State Key Laboratory of Separation Membranes and Membrane Processes Tiangong UniversityTianjin 300387China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of ChinaChengdu 610213China

Creation of freeways in a membrane accelerates water transport for efficient desalination;however,the synthesis of target membrane materials is very *** the present study,the molecular-design strategy is developed for the synthesis of porous aromatic framework(PAF)membranes with rigid and open networks to regulate water ***-based monomers in triangle shape are designed for the construction of PAF-98 and its sister frameworks,and these PAF membranes are formed through trifluoromethanesulfonic acid *** rigidity and geometry of the monomers endow PAFs with unique structures of connected pores with edging size(4.5–6.7Å)between water(2.8Å)and hydrated sodium molecules(7.2Å),enabling effective differentiation of water and *** fabricated membranes with high flexibility and continuity are ideal for water desalination,and reverse osmosis experiments demonstrate that the three PAF membranes are selective for permeation of water molecules over hydrated sodium *** water flux of 547.1 L m^(-2) h^(-1) and high rejection degree of 90%are obtained on a representative membrane of PAF-98-E;and the desalination performance is superior to currently available membrane ***,PAF-98-E membrane is capable of rejecting various cations with high efficiency in real seawater,holding great promise in practical water desalination application.

关键词： porous aromatic framework water sieving reverse osmosis molecular design membrane desalination

Chemical Speciation Distribution and Thermal Stability of Heavy Metals Along Flue Gas Cleaning systems in a Hazardous Waste Incinerator

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SSRN 2022年

作者： Li, Wenhan Ma, Zengyi Deng, Lilin Huang, Qianming Zhai, Zian Huang, Bochen Liu, Ting Wang, Shuang Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610213 China State Key Laboratory of Clean Energy Utilization Institute for Thermal Power Engineering Zhejiang University Hangzhou310027 China

In this study, chemical speciation distribution and thermal stability of heavy metals (As, Cd, Cr, Cu, Pb, Se, Zn, and Hg) along flue gas cleaning systems were investigated in a hazardous waste incinerator located in Zhejiang, China. The chemical speciation and thermal stability of heavy metals, environmental risk evaluation, and morphological and mineralogical characteristics of incineration residues were assessed before and after heat treatments at different temperatures. The results showed that As and Cr in the raw incineration residues mainly fractionated as the residual form with the proportion of over 48.9% and 74.5%, respectively, whereas most of Se was associated with the oxidizable and residual fraction. The chemical speciation of Cu and Pb in bag filter ashes was related to the chlorine content in the waste, and high chlorine availability favored the formation of acid soluble Cu and Pb. The residual fraction of Hg (over 68.0%) was the most dominant in bag filter ashes, which might exist in the form of HgS. During heat treatments at different temperatures, the vaporization of heavy metals increased with increasing temperature. As, Cr and Se showed high thermal stability due to the fact that As, Cr and Se were involved in the crystallization reaction, and heat treatment would promote the transformation from the mobile fractions into residual fraction. Hg and Cd displayed the worst thermal stability, and high temperature heat treatment would contribute to secondary volatilization from the incineration residues. Cu, Pb and Zn had moderate thermal stability, and heat treatment would cause the volatilization of the mobile fractions or transformation from the mobile fractions into residual fraction. With the increase of heat treatment temperature, the environmental risk of incineration residues displayed a decreasing trend and reached the medium risk level or below after heat treatment at 1200 °C without any additives or pretreatments. © 2022, The Authors. All ri

关键词： Heavy metals