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Design and experimental study of a field-reversed configuration plasma thruster prototype

Plasma Science and technology 2025年第3期27卷 118-126页

作者： Yuxuan HUANG Ming ZHANG Yong YANG Fangwei LYU Xiaopeng YI Chaofan LYU Yisong ZHANG Bo RAO State Key Laboratory of Advanced Electromagnetic Technology International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma PhysicsSchool of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China National Key Laboratory of Science and Technology on Vacuum Technology and Physics Lanzhou Institute of PhysicsLanzhou 730000People’s Republic of China

The field-reversed configuration(FRC)plasma thruster driven by rotating magnetic field(RMF),abbreviated as the RMF-FRC thruster,is a new type of electric propulsion technology that is expected to accelerate the deep space *** experimental prototype,including diagnostic devices,was designed and constructed based on the principles of the RMF-FRC thruster,with an RMF frequency of 210 kHz and a maximum peak current of 2 *** the rated operating conditions,the initial plasma density was measured to be 5×10^(17)m^(-3),and increased to 2.2×10^(19)m^(-3)after the action of *** coupling efficiency of RMF was about 53%,and the plasma current reached 1.9 *** axial magnetic field changed in reverse by 155 Gauss,successfully reversing the bias magnetic field of 60 Gauss,which verifies the formation of FRC *** optimization research,it was found that when the bias magnetic field is 100 Gauss,the axial magnetic field reverse variation caused by FRC is the highest at 164 *** experimental results are discussed and strategies are proposed to improve the performance of the prototype.

关键词： rotating magnetic field(RMF) field-reversed configuration(FRC) plasma thrusters plasma current

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Nanopore-rich NiFe LDH targets the formation of the high-valent nickel for enhanced oxygen evolution reaction

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Nano Research 2023年第2期16卷 2286-2293页

作者： Qunlei Wen Shuzhe Wang Ruiwen Wang Danji Huang Jiakun Fang Youwen Liu Tianyou Zhai State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China State Key Lab of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Nickel-iron layered double hydroxides(NiFe LDHs)represent a promising candidate for oxygen evolution reaction(OER),however,are still confronted with insufficient activity,due to the slow kinetics of electrooxidation of Ni^(2+)cations for the high-valent active ***,nanopore-rich NiFe LDH(PR-NiFe LDH)nanosheets were proposed for enhancing the OER activity together with *** the designed catalyst,the confined nanopores create abundant unsaturated Ni sites at edges,and decrease the migration distance of protons down to the scale of their mean free path,thus promoting the formation of high-valent Ni^(3+)/^(4+)active *** unique configuration further improves the OER stability by releasing the lattice stress and accelerating the neutralization of the local acidity during the phase ***,the optimized PR-NiFe LDH catalysts exhibit an ultralow overpotential of 278 mV at 10 mA∙cm^(−2)and a small Tafel slope of 75 mV∙dec^(−1),which are competitive among the advanced LDHs based ***,the RP-NiFe LDH catalyst was implemented in anion exchange membrane(AEM)water electrolyzer devices and operated steadily at a high catalytic current of 2 A over 80 *** results demonstrated that PR-NiFe LDH could be a viable candidate for the practical *** concept also provides valuable insights into the design of other catalysts for OER and beyond.

关键词： nickel-iron layered double hydroxides(NiFe LDHs) water oxidation nanopores high-valent sites

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Inertial PLL of Grid-connected Converter for Fast Frequency Support

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CSEE Journal of Power and Energy Systems 2023年第4期9卷 1594-1599页

作者： Xiang Guo Donghai Zhu Jiabing Hu Xudong Zou Yong Kang Josep M.Guerrero State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China. Department of Energy Technology Aalborg UniversityAalborg 9220Denmark

Frequency support capability for the grid-connected converter(GCC)is one of the basic safeguards for the stability of renewables-dominated power *** this paper,analogous to the motion equation of a synchronous generator(SG),an inertial phase-locked loop(iPLL)is proposed for GCC to achieve fast frequency *** iPLL introduces the inertial and damping loops into the classic PLL structure to emulate the natural frequency regulation characteristics of a *** with the existing methods,the iPLL has a faster frequency response and is simpler in design and ***,the proposed iPLL method is validated by *** Terms-Frequency support,grid-connected converter,inertial phase-locked loop(iPLL),synchronous generation(SG).

关键词： Frequency support grid-connected converter inertial phase-locked loop(iPLL) synchronous generation(SG).

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Study on the Phase Evolution of High Temperature Sintering Process of ZnO@Bi2O3 Core-Shell Structure Varistor Ceramic 19th

Study on the Phase Evolution of High Temperature Sintering P...

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19th Annual Conference of China Electrotechnical Society, ACCES 2024

作者： Yao, Chengfeng Song, Li Zhou, Benzheng He, Junjia State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9789819613786

The core-shell structure formed by coating can enhance the uniformity of particles within ZnO varistors, which is conducive to the improvement of their microstructure and comprehensive performance. In this study, the ZnO@Bi2O3 core-shell structure powder was prepared by chemical precipitation and calcination purification, and doped with Sb2O3 to form the ZnO@Bi2O3-Sb2O3 (ZBS) system powder, which was then compared with the doped sample. The alloying method was combined with high-temperature X-ray diffraction (HT-XRD) to investigate the phase evolution and its pattern, while scanning electron microscopy (SEM) and X-ray fluorescence (XRF) were employed to characterise the microstructure and elemental distribution. It was observed that the phase evolution of the ZBS system can be divided into two main stages: the generation of pyrochlore and its subsequent transformation to spinel. It is observed that Bi₂O₃ in the core-shell structure samples exhibits a certain selectivity for the reaction that generates the pyrochlore phase. Furthermore, the onset temperature of pyrochlore-to-spinel transformation is lower than that of the doped samples by 80–100 °C, and the reaction rate is faster. Base on the microstructural results, it was found that the core-shell structure powder spinel was more uniformly distributed with a smaller average grain size up to 5.074 μm and a more well-distributed particle size. The influence of the core-shell structure on the high-temperature sintering of ZnO varistor ceramics was discussed in terms of phase situation and microstructure. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Sintering

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The Difference of High-Temperature Sintering Between Surface-Coated and Mechanically Mixed ZnO Composite Powders

The Difference of High-Temperature Sintering Between Surface...

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International Conference of Electrical, Electronic and Networked Energy Systems, EENES 2024

作者： Song, Li Zhou, Benzheng Yao, Chengfeng He, Junjia State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9789819618552

ZnO varistors prepared by surface coating technology show certain potential in reducing grain size, refining microstructure, and improving electrical properties. The sintering process after powder preparation also has a decisive influence on the performance of the varistor. In this study, based on the simplest binary formulation of ZnO, the common additives SiO2 and Bi2O3 were selected to form ZS and ZB binary system. The surface-coated composite powder and mechanically mixed composite powder were prepared in two kinds of system. The differences of coated powder and mixed powder in sintering process at high temperature were compared from three aspects: powder morphology, thermal analysis, and phase analysis. The results can provide a reference for the sintering process optimization of ZnO coated powder. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Sintering

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Improving the reliability of classical molecular dynamics simulations in battery electrolyte design

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Journal of Energy Chemistry 2025年第2期101卷 34-41,I0002页

作者： Xin He Yujie Zhang Haomiao Li Min Zhou Wei Wang Ruxing Wang Kai Jiang Kangli Wang State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiChina State Key Laboratory of Materials Processing and Die&Mould Technology College of Materials Science and EngineeringHuazhong University of Science and Technology Wuhan 430074HubeiChina Hubei Collaborative Innovation Center for High-efficiency Utilization of Solar Energy Hubei University of TechnologyWuhan 430068HubeiChina

Explorations into new electrolytes have highlighted the critical impact of solvation structure on battery performance,Classical molecular dynamics(CMD)using semi-empirical force fields has become an essential tool for simulating solvation ***,mainstream force fields often lack accuracy in describing strong ion-solvent interactions,causing disparities between CMD simulations and experimental *** some empirical methods have been employed in some of the studies to address this issue,their effectiveness has been *** CMD research,supported by quantum chemical calculations and experimental data,reveals that the solvation structure is influenced not only by the charge model but also by the polarization *** empirical approaches that focused solely on adjusting ion-solvent interaction strengths overlooked the importance of polarization *** on this insight,we propose integrating the Drude polarization model into mainstream force fields and verify its feasibility in carbonate,ether,and nitrile *** experimental results demonstrate that this approach significantly enhances the accuracy of CMD-simulated solvation *** work is expected to provide a more reliable CMD method for electrolyte design,shielding researchers from the pitfalls of erroneous simulation outcomes.

关键词： Electrolyte Classical molecular dynamics Solvation structure Simulations

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A Physics-Informed Neural Network Model for Temperature Inversion of Axisymmetric Gas Discharge Channel 4th

A Physics-Informed Neural Network Model for Temperature Inve...

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4th International Symposium on Insulation and Discharge Computation for Power Equipment, IDCOMPU 2023

作者： Liu, Zhenyu Xiao, Lilang Chen, Shen Huang, Yubin He, Hengxin Chen, Weijiang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9789819974047

The accurate measurement of gas discharge channel temperature is of great significance for the study of lightning physics. How to accurately solve the Abel equation and reduce the impact of noise accumulation is the key to the accurate inversion of the temperature. Physics-Informed Neural Networks (PINN) have shown promising future by combining the data driving nature of neural network with physical information guidance. In this paper, the schlieren image dataset is generated by assuming temperature distribution and simulations. With the dataset, the model is developed by training a PINN guided by inverse Abel transform, where the input is a schlieren image and the output is the distribution of relative gas destiny. After training, the results show that the accuracy of the proposed PINN method is close to that of other numerical algorithms, while PINN shows a significant improvement in computation speed. Moreover, compared with other methods, the accuracy of the PINN method remains stable under varying levels of noise, indicating its robustness, while the traditional methods are significantly affected by noise. The results of this paper indicate that PINN is more efficient in temperature inversion fields and more resistant to the effects of noise than previous methods, providing strong support for gas discharge temperature inversion. © Beijing Paike Culture Commu. Co., Ltd 2024.

关键词： Inverse problems

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An Inductance-Slope-Based Sensorless Control Method for Switched Reluctance Motor 27

An Inductance-Slope-Based Sensorless Control Method for Swit...

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

作者： Zeng, Fanyan Wang, Shuanghong Li, Zixin 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 sensorless control method for switched reluctance motor (SRM) based on the inductance slope of conduction phase. First, the characteristic of inductance variation with respect to position and current is analyzed. It is observed that the inductance slope at different current levels rapidly increases at nearly the same position. Then, building on this observation, a position and speed estimation method is designed, which does not require complex online calculations or complex offline calibration experiments. Finally, experiments are carried out on a 15 kW three-phase 12/8 SRM platform to validate the effectiveness and robustness of the proposed method under different speeds and loads. © 2024 The Institute of Electrical Engineers of Japan.

关键词： Reluctance motors

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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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Study on transient and steady-state processes of corona discharge ionic wind 50

Study on transient and steady-state processes of corona disc...

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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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