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14th International Conference on Fracture, ICF 2017

作者： Bai, Xiaoming Guo, Licheng Shi, Kaikai Zheng, Liangang Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610213 China Department of Astronautic Science and Mechanics Harbin Institute of Technology Harbin150001 China

A mesoscale numerical model for the damage and fracture behavior of particle reinforced composites is proposed in present work. In this model, the digital image technique is used to reconstruct the real microstructure of composite material. The damping boundary condition is applied to absorb the artificial reflected stress wave during the simulation. Thus, the damage and fracture behavior of particle reinforced material under complex impact loads can be investigated. © 2017 ICF 2017 - 14th International Conference on Fracture. All rights reserved.

关键词： Particle reinforced composites

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Investigation of temperature field inside a Rod bundle using two-color laser induced fluorescence 17

Investigation of temperature field inside a Rod bundle using...

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17th International Topical Meeting on Nuclear reactor Thermal Hydraulics, NURETH 2017

作者： Mi, Zhengpeng Li, Xing Huang, YunLong Tan, Sichao Du, Sijia Fundamental Science on Nuclear Safety and Simulation Technology Laboratory Harbin Engineering University Harbin150001 China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610041 China

Two-color laser induced fluorescence (LIF) technique is applied to investigate the temperature distribution in rod bundles with spacer grid in this paper. In order to evaluate the characteristic, dye spectrum was analyzed to study the spectral characteristic of dye, especially temperature-variation characteristic and thermosensitivity. A transparent experimental facility using matching index of refraction (MIR) approach was designed. Various influencing factors were analyzed in calibration experiment, and the point-to-point calibration curves of temperature-light intensity applied to rod bundle were present. Accordingly, using the calibration curves, temperature field was reconstructed downstream of the spacer grid. The results showed that sensitivity of dye according to different temperature and accuracy of experiment can be improved by selecting suitable dye combination and different wavelength range. Dye peculiarity with temperature was verified in this paper. Calibration curves of temperature-light intensity were obtained by point-to-point calibration. The temperature field in rod bundles can be reconstructed, based on calibration relations. Furthermore, the temperature distributions downstream of the spacer grid are obtained. It is concluded that two-color laser-induced fluorescence technique is applicable to non-intrusive and full-field measurement in rod bundles, and it can be used as good provider for data base to validate CFD codes and evaluate the spacer grid performance. © 2016 Association for Computing Machinery Inc. All Rights Reserved.

关键词： Temperature distribution

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A High Efficiency and Precision Interpolation Method for searching Fluid Field Information around Droplets in Sparse Two-phase Flow 17

A High Efficiency and Precision Interpolation Method for sea...

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17th International Topical Meeting on Nuclear reactor Thermal Hydraulics, NURETH 2017

作者： Zhao, Fulong A. Bo, Hanliang B. Zhou, Ya C. Liu, Ying D. Institute of Nuclear and New Energy Technology Tsinghua University Beijing100084 China Science and Technology on Reactor System Design Technology Laboratory Nuclear PowerInstitute of China Chengdu610041 China

In the nuclear power station, the steam-water separator is a crucial appliance, a sequence of droplet lifecycle phenomena take place, including the droplet formation, droplet motion in the steam space, the mutual collisions between droplets, droplet extinction and the phase transformation. Together with the entraining steam, the droplets experiencing above complex processes consist a typical sparse two-phase flow, which can be well investigated by the Euler-Lagrange approach in terms of numerical simulations. With the Euler-Lagrange method, the microscopic behavior of the droplets and the steam-water separating mechanism are promising to be captured. When applying the Euler-Lagrange approach to simulate the droplets motion in the fluid field, one should first obtain the fluid parameters surrounding the droplets by the interpolation method, which may significantly influence the efficiency and precision of subsequent simulation results. In the present work, we examined the performance of four different interpolation schemes in the simulation of the droplet-steam flow inside the steam-water separator, including the k-d tree and the brute force search algorithm, the nearest point and 4-point interpolation method, and the boundary layer meshes refinement and total mesh refinement method. The computational efficiency and precision of the four methods were studied in comparison. The nearest point interpolation scheme takes less computing time, whereas with lower accuracy. Therefore, the sufficiently fine meshes are necessary to improve the calculation accuracy, which in turn lead to the reduced computational efficiency. The accuracy of the four-points interpolation scheme is remarkably higher than that of the nearest point interpolation scheme at the cost of much more (more than 2 folds) CPU time. To make a trade-off between the efficiency and precision, a high efficiency and precision interpolation method is put forward by combining the nearest point interpolation scheme

关键词： Mesh generation

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A third order gas-kinetic scheme for unstructured grid

arXiv

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arXiv 2018年

作者： Li, Ji Zhong, Chengwen Zhuo, Congshan National Key Laboratory of Science and Technology on Aerodynamic Design and Research Northwestern Polytechnical University Xi'an Shaanxi710072 China

In our study, a compact third order gas-kinetic scheme is constructed for unstructured grid which is combined the compact least-square reconstruction (CLS) method. The CLS method can achieve arbitrary high order compact reconstruction using the stencil from the whole computational domain implicitly. A large sparse linear system resulted from the CLS reconstruction method is solved by applying the generalized minimal residual algorithm (GMRES), and the Reverse-Cuthill-McKee (RCM) algorithm and the incomplete lower-upper (ILU) factorization method are implemented to accelerate the convergence of the iterative method. Different from the traditional flux solver, the BGK based gas-kinetic scheme is in the nature of spatial and temporal accuracy. Applying the second order expansion to the distribution function, the third order flux solver can be obtained directly. The accuracy of present method is validated by several numerical cases such as the advection of density perturbation problem, Sod shock wave problem, Lax shock tube test case, Shu-Osher problem, shock-vortex interaction, and lid-driven cavity flow. The advantages of this high order gas-kinetic scheme are exhibited in some benchmarks including incompressible flow and supersonic compressible flow, inviscid flow and viscous *** Codes 82C40, 76M12 Copyright © 2018, The Authors. All rights reserved.

关键词： Viscous flow

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A conservative implicit scheme for steady state solutions of diatomic gas flow in all flow regimes

arXiv

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arXiv 2018年

作者： Yuan, Ruifeng Zhong, Chengwen National Key Laboratory of Science and Technology on Aerodynamic Design and Research Northwestern Polytechnical University Xi'an Shaanxi710072 China

An implicit scheme for steady state solutions of diatomic gas flow is presented. The method solves the Rykov model equation in the finite volume discrete velocity method (DVM) framework, in which the translational and rotational degrees of freedom are taken into ac-count. At the cell interface, a difference scheme of the model equation is used to construct a multiscale ux (similar to discrete unified gas-kinetic scheme (DUGKS)), so that the cell size is not constrained by the cell Knudsen (Kn) number. The physical local time step is implemented to preserve the multiscale property in the nonuniform mesh case. The implicit macroscopic prediction technique is adopted to find a predicted equilibrium state at each time level and the implicit macroscopic governing equation is solved along with the implicit microscopic system. Furthermore, an efficient integral error compensation technique is applied, which makes the scheme conservative and allows more exible discretization for particle velocity space. In the test cases, the unstructured velocity-space mesh is used, the present method is proved to be efficient and accurate. Copyright © 2018, The Authors. All rights reserved.

关键词： Degrees of freedom (mechanics)

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Numerical investigations of free surface vortices at hydraulic bottom intakes 17

Numerical investigations of free surface vortices at hydraul...

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17th International Topical Meeting on Nuclear reactor Thermal Hydraulics, NURETH 2017

作者： Shi-wen, Liu Jie, Zhou Wei, Huang Xiang, Cheng Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China 328# Section 1 Changshun Road ShuangliuChengdu610041 China

To study the development mechanisms and flow structure characteristics of the free surface vortices and get a better understanding of the vortices phenomena. Two-phase, three dimensions, transient CFD simulations of free surface vortices at hydraulic bottom intakes have been conducted by using a volume-of-fluid (VOF) method and the scale-adaptive simulation turbulence model with curvature correction (SAS-CC). The flow field distribution and structure in different stages of transient free surface vortices were presented and analyzed. It was found that the movement and development of the vortex was determined by the interactions of main flow transportation, the axial stretching and radial dissipation of vortex. In addition, the flow characteristics on different flow conditions also have been studied, the results showed that a relatively large flow rate and small export size lead to stronger vortex, and increasing the fluid viscosity would to some extent reduce the vortex. © 2016 Association for Computing Machinery Inc. All Rights Reserved.

关键词： Vortex flow

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Research on heat removal capability of secondary passive residual heat removal system for small modular reactor 17

Research on heat removal capability of secondary passive res...

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17th International Topical Meeting on Nuclear reactor Thermal Hydraulics, NURETH 2017

作者： Zhang, Dan Ran, Xu Zhou, Ke Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Xiehe Community ShuangLiu County Changshun Road No.328 Chengdu China

The transient performance of the Secondary Passive Residual Heat Removal system (SPRHR) for a small modular PWR was studied, the study focused on the thermal hydraulic characteristics at different initial water inventory in natural circulation loop of SPRHR. The result shows that, for SPRHR of SMR, after the short term of reactor scram, the small water inventory could maintain the two phase heat transfer state in the secondary side of Once-Through Steam Generator and the first side of emergency condenser, which will strengthen the heat transfer in SPRHR. However, for long time’s operation such as 72h, the water make up to the SPRHR should be considered as defense in depth for potential water leakage from system in accident situation. © 2016 Association for Computing Machinery Inc. All Rights Reserved.

关键词： Hydraulics

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Radiolytic gas bubbles' model and its application to AHR's transient neutronics analysis

Radiolytic gas bubbles' model and its application to AHR's t...

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2017 Transactions of the American Nuclear Society, ANS 2017

作者： Liangzi, Wang Dong, Yao Yingrui, Yu Shuai, Wang Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China First-section of Chang Shun Avenue No. 328 ChengDu SiChuan610213 China

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Multivariable Feedback Linearizaton Scheme for New Excitation system Based on Full Controlled Device

Multivariable Feedback Linearizaton Scheme for New Excitatio...

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IEEE Conference on Energy Internet and Energy system Integration (EI2)

作者： Jinping He Kai Ji Derong Lin Guozhu Mei Ming Xu Huanjing Xia National Key Laboratory of Science and Technology on Vessel Integrated Power System Wuhan Institute of Marine Electric Propulsion Wu Han China

Excitation system based on full controlled devices converter(FCDES), has not only the ability of ordinary excitation system but can also supply more damping to the synchronous generator and increase the stability of power system through injecting reactive current to the grid. But as the increase of variables and the change of the system structure, the whole system becomes much complicated and harder to design the control scheme. For this complicated nonlinear system, this paper first analyzed that it's equivalent to compensating reactive power in grid side with the compensating shunt impendence. Based on this conclusion, this paper deduced a third-order model of this kind of excitation system. And with the main goal of controlling the rotor angle as well as the terminal voltage, a MIMO nonlinear control strategy was designed through this model. The simulation results show that, comparing to the linear control scheme (AVR+PSS), this nonlinear scheme has better effect in enhancing the system's damping, with the compensation capacity increase, and better effect can be achieved; when system parameters changed, still has a good performance and better suitability.

关键词： Power system stability Reactive power Generators Control systems Equivalent circuits Damping Mathematical model

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Corrigendum: Ethanol-controlled peroxidation in liquid-anode discharges (2019 J. Phys. D: Appl. Phys. 52 425205)

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Journal of Physics D: Applied Physics 2021年第22期54卷

作者： Qiang Chen Jiao Lin Xinyi He Hailong Hu Junshuai Li Qing Xiong Bingyan Chen Zhengyong Song Hai Liu Qing Huo Liu Kostya (Ken) Ostrikov Institute of Electromagnetics and Acoustics Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance Department of Electronic Science Xiamen University Xiamen 361005 People's Republic of China College of Physics and Information Engineering Fuzhou University Fuzhou 350116 People's Republic of China Key Laboratory of Special Function Materials and Structure Design of the Ministry of Education and School of Physical Science and Technology Lanzhou University Lanzhou 730000 People's Republic of China State Key Laboratory of Power Transmission Equipment and System Security and New Technology Chongqing University Chongqing 400044 People's Republic of China Department of Mathematics and Physics Hohai University Changzhou 213022 People's Republic of China School of Civil Engineering Guangzhou University Guangzhou 510006 People's Republic of China Department of Electrical and Computer Engineering Duke University Durham NC 27708 United States of America Institute for Future Environments and School of Chemistry Physics and Mechanical Engineering Queensland University of Technology Brisbane QLD 4000 Australia CSIRO-QUT Joint Sustainable Processes and Devices Laboratory Commonwealth Scientific and Industrial Research Organization PO Box 218 Lindfield NSW 2070 Australia

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