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50th EPS Conference on Plasma Physics, EPS 2024

作者： Chen, Huan Li, Chuan Yang, Yong State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9798331305239

When a high voltage is applied to the electrode with a higher curvature, an ionic wind is generated between the two electrodes. This study visualizes the ionic wind using tracer particles and uses Particle Image Velocimetry (PIV) techniques to obtain the flow field of the ionic wind, investigating both transient and steady-state processes. The results indicate that during the transient phase of negative corona ionic wind, multiple jets are generated at the needle electrode and move towards the mesh electrode, with subsequent jets exhibiting higher velocities compared to earlier jets. In contrast to the transient ionic wind, the steady-state ionic wind exhibits greater maximum velocities and an extended effective jet range. © 2024 50th EPS Conference on Plasma Physics, EPS 2024. All rights reserved.

关键词： Electromagnetic transients

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Study on the interaction mechanism of double-blade corona discharge with a large discharge gap

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Plasma Science and technology 2023年第4期25卷 101-110页

作者：李丁晨李传李家玮杨文迪肖梦涵张明于克训 International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and TechnologySchool of Electrical Engineering and ElectronicsHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China

Multi-source corona discharge is a commonly used method to generate more charged particles,but the interaction mechanism between multiple discharge sources,which largely determines the overall discharge effect,has still not been studied *** this work,a large-space hybrid model based on a hydrodynamic model and ion-transport model is adopted to study the interaction mechanism between discharge ***,the effects of the number of electrodes,voltage level,and electrode spacing on the discharge characteristics are studied by taking a double-blade electrode as an *** calculation results show that,when multiple discharge electrodes operate simultaneously,the superimposed electric field includes multiple components from the electrodes,making the ion distribution and current different from that under a single-blade *** larger the distance between discharge electrodes,the weaker the *** the electrode spacing d is larger than 4 cm,the interaction can be *** results can guide the design of large discharge gap array electrodes to achieve efficient discharge.

关键词： non-equilibrium plasma corona discharge double-blade electrode interaction numerical simulation

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Element migration and phase distribution characteristics during crystallization of rare earth phase in rare earth slag

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Journal of Rare Earths 2023年第5期41卷 780-788,I0006页

作者： Wanli Yi Xuefeng She Huai Zhang Zhenlong An Jingsong Wang Qingguo Xue State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBejing 100083China Department of Energy and Resources Engineering College of EngineeringPeking UniversityBeijing 100871China

The crystallization experiment of molten rare earth(RE)slag under different cooling rates was carried *** characteristics of element migration and phase distribution during RE phase crystallization were studied by using different *** experimental results show that there are two RE phases in the RE slag,namely(Ca,Ce,La)_(5)(SiO_(4))6F and(Ca,Ce,La,Mg)_(3)(Ti,Al,Nb)_(2)O_(7).During the cooling crystallization process of molten RE slag,Ca and P elements in the RE phase of(Ca,Ce,La)_(5)(SiO_(4))_(6)F migrate from inside to outside,and finally gather at the outer edge of the phase to form phase Ca_(3)(PO4)*** RE phase(Ca,Ce,La)_(5)(SiO_(4))_(6)F is distributed inside the furnace-cooled slag,and the RE phase(Ca,Ce,-La,Mg)_(3)(Ti,AI,Nb)_(2)O_(7)is distributed in the surface layer of the furnace-cooled *** based on the phase distribution characteristics,the central hollowing method is proposed to realize the preliminary enrichment of valuable elements Ti,Nb and RE in RE slag.

关键词： Rare earth slag Element migration Phase distribution Element enrichment

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Efficient flexible perovskite solar cells and modules using a stable SnO_(2)-nanocrystal isopropanol dispersion

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Nano Research 2024年第4期17卷 2704-2711页

作者： Zhiwei Su Jing Li Ruixuan Jiang Shujie Zhang Chengkai Jin Feng Ye Bingcan Ke Mengjun Zhou Jinhui Tong Hyesung Park Fuzhi Huang Yi-Bing Cheng Tongle Bu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China School of Material Science and Engineering Wuhan University of TechnologyWuhan 430070China Department of Materials Science and Engineering Graduate School of Semiconductor Materials and Devices EngineeringGraduate School of Carbon NeutralityLow Dimensional Carbon Materials CenterUlsan National Institute of Science and TechnologyUlsan 44919Republic of Korea Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Foshan 528200China

The outstanding advantages of lightweight and flexibility enable flexible perovskite solar cells(PSCs)to have great application potential in mobile energy *** to the low cost,low-temperature processibility,and high electron mobility,SnO_(2) nanocrystals have been widely employed as the electron transport layer in flexible *** prepare high-quality SnO_(2) layers,a monodispersed nanocrystal solution is normally ***,the SnO_(2) nanocrystals can easily aggregate,especially after long periods of ***,we develop a green and cost-effective strategy for the synthesis of high-quality SnO_(2) nanocrystals at low temperatures by introducing small molecules of glycerol,obtaining a stable and well-dispersed SnO_(2)-nanocrystal isopropanol dispersion *** to the enhanced dispersity and super wettability of this alcohol-based SnO_(2)-nanocrystal solution,large-area smooth and dense SnO_(2) films are easily deposited on the plastic conductive ***,this contributes to effective charge transfer and suppressed non-radiative recombination at the interface between the SnO_(2) and perovskite *** a result,a greatly enhanced power conversion efficiency(PCE)of 21.8%from 19.2%is achieved for small-area flexible PSCs.A large-area 5 cm×5 cm flexible perovskite solar mini-module with a champion PCE of 16.5%and good stability is also demonstrated via this glycerol-modified SnO_(2)-nanocrystal isopropanol dispersion approach.

关键词： tin oxide isopropanol dispersion colloid stability flexible perovskite solar cells

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Nonlinear optical response of BiVO4 and its application for ultrafast pulsed fiber lasers

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Optics Express 2025年第3期33卷 6559-6566页

作者： Du, Ruonan Shi, Aokun Lian, Yudong Fang, Huajing Qi, Yaoyao Bai, Zhenxu Wang, Yulei Huang, Feng Ding, Jie Lu, Zhiwei Center for Advanced Laser Technology Hebei University of Technology Tianjin300401 China Hebei Key Laboratory of Advanced Laser Technology and Equipment Tianjin300401 China State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong University Xi’an710049 China College of Mechanical Engineering and Automation Fuzhou University Fuzhou350108 China

Herein, we present aN Er-doped all-fiber laser with BiVO4 as the saturable absorber (SA). To illustrate the nonlinear optical response, a two-dimensional model of monoclinic and its electronic structure was calculated. The nonlinear absorption properties were evaluated utilizing the Z-scan technique, and a saturable absorber was fabricated for integration into a fiber laser, resulting in a stable Q-switched output. At a maximum pump power of 600 mW, the fiber laser achieved an average output power of 25.23 mW and a pulse energy of 330.76 nJ. This research confirms that BiVO4 material exhibits outstanding nonlinear optical characteristics, thereby broadening its scope of application in the realm of ultrafast pulsed fiber lasers. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Optical depth

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Research on Rotor Strength and Critical Speed of the Air-Core Pulsed Alternator 10

Research on Rotor Strength and Critical Speed of the Air-Cor...

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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： Wan, Jijian Yu, Kexun Wang, Jiasong Xie, Xianfei Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9789038661353

The Air-Core Pulsed Alternator (APA) is the preferred power supply for electromagnetic launch systems [1]. However, due to the enormous centrifugal force and the electromagnetic impact torque, extremely high demands are placed on the strength of the rotor structure. In addition, the design speed of APA is usually high, requiring the machine to pass through the first-order critical speed rapidly to avoid the occurrence of resonance. This paper investigated the structural strength and critical speed of the rotor, as these are two of the most common issues considered in the structural design of the rotor of APA, and discussed the design of the main dimensions of the rotor on this basis. © 2024 Eindhoven University of technology.

关键词： Electromagnetic launchers

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Solar evaporation for simultaneous oil-water separation and electricity generation with Janus wood-based absorbers

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Frontiers of Environmental Science & engineering 2024年第2期18卷 13-23页

作者： Yue Yang Ze Fu Qi Zhang Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse School of Environmental and Biological EngineeringNanjing University of Science&TechnologyNanjing 210094China Key Laboratory of Industrial Ecology and Environmental Engineering(Ministry of Education) School of Environmental Science and TechnologyDalian University of TechnologyDalian 116024China National Laboratory of Solid State Microstructures Collaborative Innovation Center of Advanced MicrostructuresCollege of Engineering and Applied SciencesKey Laboratory of Intelligent Optical Sensing and Manipulation(Ministry of Education)Jiangsu Key Laboratory of Artificial Functional MaterialsNanjing UniversityNanjing 210093China

Oily wastewater from ocean oil spills endangers marine ecosystems and human health. Therefore, developing an effective and sustainable solution for separating oil-water mixtures is urgent. Interfacial solar photothermal evaporation is a promising approach for the complete separation of two-phase mixtures using only solar energy. Herein, we report a carbonized wood-based absorber with Janus structure of comprising a hydrophobic top-layer and an oleophobic bottom-layer for simultaneous solar-driven oil-water separation and electricity generation. Under sunlight irradiation, the rapid evaporation of seawater will induce a separation of oil-water mixtures, and cause a high salt concentration region underlying the interface, while the bottom “bulk water” maintains in a low salt concentration, thus forming a salinity gradient. Electricity can be generated by salinity gradient power. Therefore, oil-water separation efficiency of > 99% and derived extra electricity power of ~0.1 W/m2 is achieved under solar radiation, demonstrating the feasibility of oil-water separation and electricity production synchronously directly using solar energy. This work provides a green and cost-effective path for the separation of oil-water mixtures.

关键词： Oily wastewater Carbonized wood Salinity gradient Electricity generation Solar irradiation

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DC active power filter based on model predictive control for DC bus overvoltage suppression of accelerator grid power supply

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Plasma Science and technology 2023年第6期25卷 1-13页

作者：张鸿淇朱帮友马少翔李志恒张明潘垣 International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and Technology and School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People's Republic of China

The China Fusion engineering Test Reactor plans to build a 200 k V/25 A acceleration grid power supply(AGPS)for the negative-ion-based neutral beam injector prototype *** AGPS uses a rectifier-inverter-isolated step-up *** is a DC bus between the rectifier and the *** order to limit DC bus voltage ripple and transient fluctuations,a large number of capacitors are used,which degrades the reliability of the power supply and occupies a large amount of *** work finds that due to the difference in the turn-off time of the rectifier and the inverter,the capacitance mainly depends on the rectifier current when the inverter is turned *** this basis,an active power filter(APF)scheme is proposed to absorb the *** enhance the dynamic response ability of the APF,model predictive control is *** this paper,the circuit structure of the APF is introduced,the prediction model is deduced,the corresponding control strategy and signal detection method are proposed,and the simulation and experimental results show that APF can track the transient current of the DC bus and reduce the voltage fluctuation significantly.

关键词： CFETR NBI accelerator grid power supply power active filter model predictive control

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Comparative Study of the Rectifier Topology for Efficient Renewable Power-to-Hydrogen System 14

Comparative Study of the Rectifier Topology for Efficient Re...

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14th International Conference on Power and Energy Systems, ICPES 2024

作者： Hu, Kewei Fang, Jiakun Zhong, Zhiyao Lu, Ang Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350391329

The power ripple generated by the rectifier tends to pull down the power-to-hydrogen efficiency of water electrolyzers, which is rarely considered in the current research. In this paper, the impact of power ripple on electrolyzer performance is quantified based on electrochemical principle. Furthermore, different types of rectifiers, including thyristorbased, diode-based and IGBT-based rectifiers are compared in terms of efficiency. These topologies are further tested in the green hydrogen production system to find out the optimal topology to maximize the economical profit of the system. © 2024 IEEE.

关键词： energy conversion efficiency Power-to-hydrogen rectifier topology

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An Online Torque Sharing Function with Torque Reference Self-Adjusting Method for Switched Reluctance Machines 27

An Online Torque Sharing Function with Torque Reference Self...

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27th International Conference on Electrical Machines and Systems, ICEMS 2024

作者： Li, Zixin Wang, Shuanghong Zhou, Libing Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9784886864406

This paper proposes a torque sharing function (TSF) for Switched reluctance motor (SRM) based on the torque closed-loop compensation. Firstly, the online TSF method proposed in this paper takes the negative torque caused by current tailing into account and compensate it in the incoming phase. Secondly, the reference torque of incoming phase and outgoing phase are compensated through torque closed-loop, which enhance the system response ability. Thirdly, six-segment commutation intervals of the traditional TSF methods are divided into twelve segments and the switching states of commutation interval are reassigned, which reduces torque ripple caused by current tracking errors effectively. Simulation of the proposed TSF method and traditional TSF methods have been done on MATLAB. The results prove that the proposed TSF method has lower torque ripple and better current tracking capability compared to the traditional TSF. © 2024 The Institute of Electrical Engineers of Japan.

关键词： Reluctance motors

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