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Stress wave analysis of high-voltage pulse discharge rock fragmentation based on plasma channel impedance model

Plasma Science and technology 2023年第6期25卷 52-64页

作者：黄仕杰刘毅赵勇徐尤来林福昌李化张钦李柳霞 School of Electrical and Electronic Engineering Huazhong University of Science and TechnologyWuhan 430074People's Republic of China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan 430074People's Republic of China Key Laboratory of Pulsed Power Technology(Huazhong University of Science and Technology) Ministry of EducationWuhan 430074People's Republic of China

High-voltage pulse discharge(HVPD)rock fragmentation controls a plasma channel forming inside the rock by adjusting the electrical parameters,electrode type,*** this work,an HVPD rock fragmentation test platform was built and the test waveforms were *** the effects of temperature,channel expansion and electromagnetic radiation,the impedance model of the plasma channel in the rock was *** parameters and initial values of the model were determined by an iterative computational *** model calculation results can reasonably characterize the development of the plasma channel in the rock and estimate the shock wave *** on the plasma channel impedance model,the temporal and spatial distribution characteristics of the radial stress and tangential stress in the rock were calculated,and the rock fragmentation effect of the HVPD was analyzed.

关键词： stress wave shock wave plasma channel impedance model rock fragmentation high-voltage pulse discharge

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Clustering Optimization Method for Liquid Metal Battery Screening Requirements 11

Clustering Optimization Method for Liquid Metal Battery Scre...

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11th International Conference on Power Electronics - ECCE Asia, ICPE 2023-ECCE Asia

作者： Zhang, A.E. Kangli Wang, B. Jiang, C. Kai Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Hubei Wuhan430074 China

ISBN: (纸本)9788957083505

Liquid metal battery (LMB) exhibits the potential to appear as a cost-effective solution for grid-scale energy storage to improve the stability and flexibility of new power systems. In order to improve the consistency and reliability of liquid metal battery packs, a novel classification method is proposed in this paper. Firstly, a feature vector for battery screening is established from the key influencing factors of battery pack performance. Secondly, the density-based spatial clustering of applications with noise (DBSCAN) algorithm whose input parameters have been optimized by the elbow method is used to detect outliers among sample data. Then, the remaining data are screened by the Mean shift algorithm and the Davies-Bouldin Index (DBI) as the optimized objective. Finally, an experimental of 216 laboratory-made LMBs with the proposed method is presented and the clustering optimization results verify that the proposed method can automatically determine the number of clustering and improve the accuracy of clustering with outlier detection. © 2023 The Korean Institute of Power Electronics.

关键词： Cost effectiveness

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Development of Trigger Source for Surface-triggered Vacuum Switch 4

Development of Trigger Source for Surface-triggered Vacuum S...

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4th IEEE China International Youth Conference on Electrical engineering, CIYCEE 2023

作者： Yao, Yuhui Dai, Ling Wang, Shiqi Lv, Jing Lin, Fuchang Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology Wuhan430074 China Huazhong University of Science and Technology School of Electrical and Electronic Engineering Wuhan430074 China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan430074 China

ISBN: (纸本)9798350305562

This article focuses on the development of a trigger source for a three-electrode flat triggering vacuum switch with a small electrode gap of less than 10mm. The selection and verification of circuit components for the trigger source were conducted, and it was found that the trigger source circuit can output a peak pulse voltage of up to 12.25kV and a rise time of 7.9μs under no-load conditions. Subsequently, the trigger source was connected to the trigger electrode, resulting in a breakdown voltage of approximately 9.5kV at the trigger electrode. Through multiple repeated experiments, it was determined that the trigger source can reliably trigger the trigger electrode at a trigger voltage peak exceeding 9.5kV. © 2023 IEEE.

关键词： Electrodes

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Transient Stability Analysis and Damping Enhanced Control of Grid-Forming Wind Turbines Considering Current Saturation Procedure

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IEEE Transactions on Energy Conversion 2024年 1-11页

作者： Zhu, Donghai Ma, Yumei Li, Xiangjinwen Fan, Liuyang Tang, Binwei Kang, Yong State Key Laboratory of Advanced Electromagnetic Technology School of Electrical Engineering Huazhong University of Science and Technology Wuhan China China-EU Institute for Clean and Renewable Energy Huazhong University of Science and Technology Wuhan China Mingyang Smart Energy Group Ltd. Zhongshan China

The grid-forming wind turbine (GFM-WT) is prone to transient instability during grid fault, due to the control switch of current limitation. However, the existing work ignores the transient instability issues caused by current saturation procedure, failing to fully reveal the instability mechanism. To deal with the problem, this article analyzes the current saturation procedure of GFM-WT after grid faults. It is pointed out that there exist two current saturation conditions, i.e., the current saturation mode instantaneously (CSMI) and the current saturation mode subsequently (CSMS). Then, the transient stability of GFM-WT is analyzed considering above new operational modes. It indicates that the transient characteristic of power angle will be reshaped during current saturation procedure. Based on it, a damping enhanced control method is proposed to improve the transient stability, by damping the power angle overshoot during current saturation procedure. Finally, the analysis and proposed control method are verified by the experiments. IEEE

关键词： Transient stability

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Experimental Investigations of Quasi-Coherent Micro-Instabilities in J-TEXT Ohmic Plasmas

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Chinese Physics Letters 2024年第5期41卷 47-52页

作者：石鹏庄革程芝峰高丽周乙楠刘永罗景庭李景春 Institute of Plasma Physics Chinese Academy of SciencesHefei 230031China International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and TechnologySchool of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China Department of Engineering and Applied Physics School of Physical Sciences University of Science and Technology of ChinaHefei 230026China Shenzhen Key Laboratory of Nuclear and Radiation Safety Institute for Advanced Study in Nuclear Energy&SafetyCollege of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 510640China

Quasi-coherent micro-instabilities is one of the key topics of magnetic confinement fusion. This work focuses on the quasi-coherent spectra of ion temperature gradient(ITG) and trapped-electron-mode instabilities using newly developed far-forward collective scattering measurements within ohmic plasmas in the J-TEXT *** ITG mode is characterized by frequencies ranging from 30 to 100 k Hz and wavenumbers(k_(θρs)) less than 0.3. Beyond a critical plasma density threshold, the ITG mode undergoes a bifurcation, which is marked by a reduction in frequency and an enhancement in amplitude. Concurrently, enhancements in ion energy loss and degradation in confinement are observed. This ground-breaking discovery represents the first instance of direct experimental evidence that establishes a clear link between ITG instability and ion thermal transport.

关键词： ITG mode collective

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Enabling superior electrochemical performance of NCA cathode in Li_(5.5)PS_(4.5)Cl_(1.5)-based solid-state batteries with a dual-electrolyte layer

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Chinese Chemical Letters 2024年第4期35卷 231-236页

作者： Ziling Jiang Shaoqing Chen Chaochao Wei Ziqi Zhang Zhongkai Wu Qiyue Luo Liang Ming Long Zhang Chuang Yu School of Chemistry and Chemical Engineering Huazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China Innovation Center for Chemical Sciences College of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China College of Physics and Energy Fujian Normal UniversityFuzhou 350117 China

LiNi_(0.8)Co_(0.15)Al_(0.05)O_(2)(NCA) is a promising cathode for sulfide-based solid-state lithium batteries(ASSLBs)profiting from its high specific capacity and voltage plateau, which yielding high energy density. However, the inferior interfacial stability between the bare NCA and sulfides limits its electrochemical performance. Hereien, the dual-electrolyte layer is proposed to mitigate this effect and enhance the battery performances of NCA-based ASSLIBs. The Li_(3)InCl_6 wih high conductivity and excellent electrochemcial stability act both as an ion additives to promote Li-ion diffusion across the interface in the cathode and as a buffer layer between the cathode layer and the solid electrolyte layer to avoid side reactions and improve the interface stability. The corresponding battery exhibits high discharge capacities and superior cyclabilities at both room and elevated temperatures. It exhibits discharge performance of 237.04 and216.07 m Ah/g at 0.1 and 0.5 C, respectively, when cycled at 60 ℃, and sustains 95.9% of the capacity after100 cycles at 0.5 C. The work demonstrates a simple strategy to ensure the superior performances of NCA in sulfide-based ASSLBs.

关键词： LiNi_(0.8)Co_(0.15)Al_(0.05)O_(2) Li_(5.5)PS_(4.5)Cl_(1.5) Double solid electrolyte layer configuration Operating temperatures Electrochemical performances

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Development of an atmospheric fluorocarbon plasma jet generated by pulse modulated microwave discharge

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Plasma Science and technology 2023年第11期25卷 91-100页

作者：陈思乐任鑫柳陈兆权徐笑娟程涛李平张冠军卢新培 School of Electrical and Information Engineering Anhui University of TechnologyMa’anshan 243032People’s Republic of China School of Electrical and Information Engineering Anhui University of Science and TechnologyHuainan 232001People’s Republic of China State Key Laboratory of Electrical Insulation and Power Equipment School of Electrical EngineeringXi’an Jiaotong UniversityXi’an 710049People’s Republic of China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan 430074People’s Republic of China

Atmospheric fluorocarbon plasma plays an important role in the surface modification of insulating materials like *** existing fluorocarbon plasma is usually generated by dielectric barrier discharge,which has a low concentration of reactive species and may cause insufficient surface *** work attempts to develop an atmospheric fluorocarbon plasma jet using a coaxial transmission line resonator by microwave discharge with locally enhanced electric field and high *** gas temperature is reduced by pulse modulation *** kinds of working gases,pure CF_(4),Ar/CF_(4)and He/CF_(4),are utilized to generate the atmospheric microwave fluorocarbon plasma *** discharge images,optical emission spectra,electron densities and gas temperatures are studied *** results show that the Ar/CF_(4)plasma jet has the best comprehensive performance,such as strong discharge intensity and controllable gas *** electron density of the Ar/CF_4plasma jet has a magnitude of 10~(20)m^(-3),indicating a higher density than that of the frequently used dielectric barrier *** the other conditions unchanged,the gas temperature at the end of the Ar/CF_(4)plasma jet can be reduced from 410.2 to 347.3 K by decreasing the duty cycle of the modulated pulse from 0.5 to ***,the microwave Ar/CF_(4)plasma jet is considered to be a promising fluorocarbon plasma source for surface fluorination of polymers.

关键词： microwave discharge atmospheric pressure plasma jet fluorocarbon plasma(Some figures may appear in colour only in the online journal)

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General Description of Solid Armatures in electromagnetic Railguns 10

General Description of Solid Armatures in Electromagnetic Ra...

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10th Euro-Asian Pulsed Power Conference, 25th International Conference on High-Power Particle Beams and 20th International Symposium on electromagnetic Launch technology, EAPPC-BEAMS-EML 2024

作者： Chen, Lixue Zhang, Wenhao Li, Lidong Xu, Shengqin State Key Laboratory of Advanced Electromagnetic Technology Huazhong University of Science and Technology Key Laboratory of Pulsed Power Technology Ministry of Education School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9789038661353

Armature, as an important part of the electromagnetic launch system, is a current carrier which converts electric energy into kinetic energy of projectiles, and it often suffers extreme environment in the launch process. Therefore, the performance of launch system is directly affected by the armature whose structure is the fundamental of the application of launch technology. Among various armature types, solid armatures are the most widely used because of some characteristics of them, like high efficiency and low mass. Based on some key functions of solid armatures, three kinds of requirements including current-carrying capacity, mechanical pressure and electromagnetic contact pressure are proposed in this paper. Besides, research progress of material and structure of the solid armature and its optimization is also introduced in this paper. © 2024 Eindhoven University of technology.

关键词： Kinetic energy

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Corrosion behavior of Gd_(2)Zr_(2)O_(7)thermal barrier coatings under Fe-containing environmental sediment attack

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Journal of advanced Ceramics 2024年第4期13卷 447-462页

作者： Lei Guo Yanyan Li Kai Yan School of Materials Science and Engineering Tianjin UniversityTianjin 300072China Tianjin Key Laboratory of Advanced Joining Technology Key Lab of Advanced Ceramics and Machining Technology of Ministry of EducationTianjin 300072China Key Laboratory of Special Equipment Safety and Energy-saving for State Market Regulation China Special Equipment Inspection&Research InstituteBeijing 100029China

Environmental sediments mainly consisting of CaO–MgO–Al_(2)O_(3)–SiO_(2)(CMAS)corrosion are a serious threat to thermal barrier coatings(TBCs),in which Fe element is usually ***_(2)Zr_(2)O_(7)TBCs are famous for their excellent CMAS *** this study,the characteristics of Fe-containing environmental sediments(CMAS-Fe)and their corrosiveness to Gd_(2)Zr_(2)O_(7)coatings were *** types of CMAS-Fe glass with different Fe contents were *** melting points were measured to be 1322–1344℃,and the high-temperature viscosity showed a decreasing trend with increasing Fe *** corrosion behavior of four types of CMAS-Fe to Gd_(2)Zr_(2)O_(7)coatings at 1350℃was *** the initial corrosion stage(0.1 h),anorthite was precipitated in CMAS-Fe with a high Ca:Si ratio,while Fe-garnet was formed in the melt with the highest Fe *** the corrosion time resulted in the formation of a reaction layer,which exhibited an interpenetrating network composed of Gd-oxyapatite,ZrO_(2),and residual *** spinel was precipitated within the reaction *** 1 h or even longer time,the reaction layers tended to be stable and compact,which had comparable hardness and fracture toughness to those of Gd_(2)Zr_(2)O_(7)*** the cyclic CMAS-Fe attack,the residual CMAS-Fe in the interpenetrating network provided a pathway for the redeposited CMAS-Fe infiltration,resulting in the continuous growth of the reaction *** a result,the Gd_(2)Zr_(2)O_(7)coatings had a large consumption in the thickness,degrading the coating ***,the Gd_(2)Zr_(2)O_(7)coatings exhibit unsatisfactory corrosion resistance to CMAS-Fe attack.

关键词： thermal barrier coatings(TBCs) Gd_(2)Zr_(2)O_(7) Fe-containing CaO-MgO-Al2O3-SiO_(2)(CMAS) corrosion resistance reaction layer

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In-situ polymerized carbonate induced by Li-Ga alloy as novel artificial interphase on Li metal anode

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Chinese Chemical Letters 2023年第9期34卷 294-299页

作者： Ziping Wang Shuyuan Xie Xuejie Gao Xinyang Chen Lina Cong Jun Liu Haiming Xie Chuang Yu Yulong Liu School of Chemistry Northeast Normal UniversityChangchun 130024China Center for Lignocellulosic Chemistry and Biomaterials College of Light Industry and Chemical EngineeringDalian Polytechnic UniversityDalian 116034China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Li metal is considered an ideal anode material because of its high theoretical capacity and low electrode ***,the practical usage of Li metal as an anode is severely limited because of inevitable parasitic side reactions with electrolyte and dendrites *** present,single-component artificial solid electrolyte interphase cannot simultaneously meet the multiple functions of promoting ion conduction,guiding lithium ion deposition,inhibiting dendrite growth,and reducing interface side ***,multi-component design on Li metal surface is widely investigated to achieve long-term ***,we report a Li_(2)Ga-carbonate polymer interphase layer to solve volume changes,Li dendrites formation and *** a result,the Li symmetric cell can be stabilized at 3.0 m A/cm^(2)in carbonate electrolyte with limited volume of 20μ*** with 13.6 mg/cm^(2)(loading of 2 mAh/cm^(2))LiFePO_(4)cathode,discharge capacity retains at 90%for over 150 cycles under limited electrolyte *** such an alloy-polymer interphase layer,higher energy density Li metal batteries become prominent in the near future.

关键词： Lithium metal Alloy Polymer film High energy density Self-healing

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