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Upgrade of an integrated Langmuir probe system on the closed divertor target plates in the HL-2A tokamak

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Plasma Science and Technology 2022年第5期24卷 9-16页

作者： Zhihui HUANG Jun CHENG Na WU Longwen YAN Hongbing XU Weice WANG Xianggan MIAO kaiyang yi Jianqiang XU Laizhong CAI Zhongbing SHI Jiaqi DONG yi LIU Wulyu ZHONG Qingwei YANG Min XU Xuru DUAN Southwestern Institute of Physics Chengdu 610041People’s Republic of China Institute of Fusion Science School of Physical Science and TechnologySouthwest Jiaotong UniversityChengdu 610031People’s Republic of China Institute for Fusion Theory and Simulation Zhejiang UniversityHangzhou 310027People’s Republic of China

A newly designed divertor Langmuir probe diagnostic system has been installed in a rare closed divertor of the HL-2A tokamak and steadily operated for the study of divertor physics involved edge-localized mode mitigation,detachment and redistribution of heat flux,*** sets of probe arrays including 274 probe tips were placed at two ports(approximately 180°separated toroidally),and the spatial and temporal resolutions of this measurement system could reach6 mm and 1μs,respectively.A novel design of the ceramic isolation ring can ensure reliable electrical insulation property between the graphite tip and the copper substrate plate where plasma impurities and the dust are deposited into the gaps for a long experimental ***,the condition monitoring and mode conversion between single and triple probe of the probe system could be conveniently implemented via a remote-control *** preliminary experimental result shows that the divertor Langmuir probe system is capable of measuring the high spatiotemporal parameters involved the plasma density,electron temperature,particle flux as well as heat flux during the ELMy H-mode discharges.

关键词： Langmuir probe H-mode discharge HL-2A tokamak divertor physics

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圆管内流动水发生结冰的影响因素研究

太阳能学报 2001年第3期22卷 250-255页

作者：曲凯阳江亿清华大学建筑学院建筑技术科学系北京100084

该文测量了不同运行状态下圆管内流动水发生结冰的时间 ,研究了水的流速不变时圆管内表面温度对结冰发生的影响 ,研究了水的流动状态对结冰发生的影响 ,提出了防止圆管内流动的水发生结冰的条件。

关键词：太阳能热水系统圆管内流动结冰水

Scaling Laws of Heat Flux Width in the HL-2A Closed Divertor Tokamak

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Chinese Physics Letters 2022年第11期39卷 37-41页

作者： Longwen Yan Jinming Gao Xianggan Miao Zhihui Huang Na Wu Wenjin Chen Ting Wu Weice Wang Liang Liu Xiaoxue He kaiyang yi Yu He Lin Nie Zhongbing Shi Wulv Zhong Southwestern Institute of Physics Chengdu 610225China

The scaling law of divertor heat flux width is one of the key topics of magnetic confinement fusion,which is almost inversely proportional to the poloidal magnetic field on some opened divertor *** work focuses on the scaling laws of the closed divertor heat flux width in the HL-2 A tokamak under different discharge conditions,such as the Ohmic,L-and *** results indicate that there are basic similarities of the scaling laws of the heat flux width between the opened and closed ***,a larger spreading width in the private flux region is found,which is relevant to a small expansion factor of the magnetic flux in the closed divertor.

关键词： tokamak magnetic scaling

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各种因素对过冷水发生结冰的影响

太阳能学报 2003年第6期24卷 814-821页

作者：曲凯阳江亿清华大学建筑学院建筑技术科学系北京100084

研究外界因素对过冷水发生结冰的影响,是研究防止结冰以及制冰方法的基础。本文研究了结冰基体表面粗糙度,表面材料,表面面积,对结冰基体表面的摩擦、按压等作用,水的流动状态以及对水的磁化等对过冷水发生结冰的影响,对实验结果进行了... 详细信息

研究外界因素对过冷水发生结冰的影响,是研究防止结冰以及制冰方法的基础。本文研究了结冰基体表面粗糙度,表面材料,表面面积,对结冰基体表面的摩擦、按压等作用,水的流动状态以及对水的磁化等对过冷水发生结冰的影响,对实验结果进行了初步的理论解释,并对文献的实验结果进行了分析。

关键词：过冷水结冰发生影响因素制冰方法防止结冰

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高性能过冷水连续制冰系统

太阳能学报 2002年第3期23卷 317-321页

作者：曲凯阳江亿清华大学建筑技术科学系北京100084

过冷水连续制冰是最近发展起来的一种新的制冰技术 ,与传统的静态制冰相比 ,具有较高的制冰率和能量效率 ,制出的泥状冰分散性好 ,可以直接随水在管道中输送。在前文研究的基础上 ,建立了具有较高性能的过冷水连续制冰系统。过冷却器换... 详细信息

过冷水连续制冰是最近发展起来的一种新的制冰技术 ,与传统的静态制冰相比 ,具有较高的制冰率和能量效率 ,制出的泥状冰分散性好 ,可以直接随水在管道中输送。在前文研究的基础上 ,建立了具有较高性能的过冷水连续制冰系统。过冷却器换热段长度 3m ,过冷却器进口水温为 0 5℃ ,出口水温达到 - 3 3℃。系统性能可望进一步提高 ,达到实际开发利用的水平。

关键词：过冷水连续制冰泥状冰能量效率制冰技术

Electron sheaths near a positively biased plate subjected to a weak electron beam

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Plasma Science and Technology 2023年第3期25卷 70-77页

作者：刘琦卫子安马锦秀弋开阳陶万李政元 School of Physical Sciences University of Science and Technology of ChinaHefei 230026Peopleʼs Republic of China Department of Plasma Physics and Fusion Engineering University of Science and Technology of ChinaHefei 230026Peopleʼs Republic of China Southwestern Institute of Physics Chengdu 610041Peopleʼs Republic of China

Electron sheaths have previously only been measured near a positively biased small electrode, in which a potential dip was often observed. In this paper, we present an experimental study on the electron sheath near a stainless steel plate in the presence of a weak electron beam. It is shown that the electron beam, though its density is much lower than that of the background plasma, will substantially alter the sheath structure, i.e., it causes the disappearance of the potential dip when the beam energy just exceeds the ionization potential of the neutral gas but later enhances the dip for higher energies. It is also shown that proper biases on the plate and chamber wall are the key to the formation of the electron sheath and the dip. For a fixed plate bias but with different electron beam energy, the measured thickness of the ion-free Child–Langmuir sheath agrees well with that of the theoretical model.

关键词： electron sheath potential dip electron-beam-plasma system

Index allocation for a reusable LOX/CH4 rocket engine

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Chinese Journal of Aeronautics 2021年第2期34卷 432-440页

作者： yi LI Jie FANG Bing SUN kaiyang LI Guobiao CAI School of Astronautics Beihang UniversityBeijing 100083China Key Laboratory of Spacecraft Design Optimization and Dynamic Simulation Technologies(Beihang University) Ministry of EducationBeijing 100083China

Reusable rocket engines are the core components of reusable launch vehicles, and have thus become a major focus of aerospace engineering research in recent years. In practice, subsystem design is based on the overall index allocation of an engine;therefore, a multidisciplinary optimization approach is necessary. In this study, design of a reusable methane/liquid oxygen(LOX/CH4)rocket engine with a gas generator cycle was investigated using multidisciplinary optimization. Two parameters were chosen as design variables: pressure and fuel mix ratio of the main combustion chamber. Optimization objectives were specific impulse, structural mass, and life cycle cost of the reusable rocket engine, and constraints were assigned to each discipline according to rocket design requirements. Then, an optimization model was developed, and optimal design parameters were acquired for the LOX/CH4 rocket engine. The proposed method is effective for designing the index allocation of reusable rocket engines and takes into account the multidisciplinary nature of complex systems.

关键词： Index allocation Mass model Multidisciplinary optimization Reliability Rocket engines

宁夏东部沙地柠条花棒混交固沙恢复区水氮添加对草本植物群落的影响

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草学 2024年第2期 19-27页

作者：何毅邱开阳苗虎丁宁宁夏大学农学院宁夏银川750021 固原市六盘山林业局宁夏隆德756399 宁夏南华山国家级自然保护区管理处宁夏海原755200

为研究降水变化和大气氮沉降对沙地植物群落结构和生物量的影响,在宁夏灵武白芨滩国家级自然保护区进行水氮添加试验,采用随机区组试验设计,包含4个水处理:W_(0)为自然降水量、W_(1)为多年平均降水量的33%、W_(2)为多年平均降水量的66%... 详细信息

为研究降水变化和大气氮沉降对沙地植物群落结构和生物量的影响,在宁夏灵武白芨滩国家级自然保护区进行水氮添加试验,采用随机区组试验设计,包含4个水处理:W_(0)为自然降水量、W_(1)为多年平均降水量的33%、W_(2)为多年平均降水量的66%、W_(3)为多年平均降水量的100%,4个氮处理0gN·m^(-2)·a^(-1)(N_(0))、5gN·m^(-2)·a^(-1)(N_(1))、10gN·m^(-2)·a^(-1)(N_(2))、20gN·m^(-2)·a^(-1)(N_(3))。设置4个试验小区,每个小区包含4个水处理和4个氮处理随机组合的16个处理。结果表明:1)水氮添加使植物群落的重要值和群落结构发生了显著变化。2)氮添加导致群落物种丰富度指数先减小后增大,在W_(2)N_(1)处理下有最大值;随着水分含量的增加,Shannon-Wiener多样性指数、Simpson优势度指数和Pielou均匀度指数在同一氮素添加水平下呈先增大后减小的趋势,在W_(2)N_(1)处理下有最大值。3)水氮添加促进了地上生物量的增加,适量的水氮添加有利于植物的生长发育。在W_(2)N_(1)处理下固沙恢复区草本植物群落的地上生物量和盖度最大,在W_(0)N_(1)处理最小。

关键词：水氮添加地上生物量群落结构

维普期刊数据库博看期刊

基于信息调控和MATCN的超短期风电功率多步预测

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现代电子技术 2024年第18期47卷 1-7页

作者：陈磊黄凯阳张怡陈禹张志瑞尹振楠华北理工大学电气工程学院河北唐山063210 河北省风光氢储安全监测与智能运行技术创新中心河北唐山063210

对波动的风电功率进行有效预测,是电网供需平衡、系统稳定运行的重要保障。为此,提出一种基于信息调控和MATCN的超短期风电功率多步预测方法。利用现有数据衍生出高阶项与交互项,提升特征序列数量与有效特征占比。针对复杂的风电数据结... 详细信息

对波动的风电功率进行有效预测,是电网供需平衡、系统稳定运行的重要保障。为此,提出一种基于信息调控和MATCN的超短期风电功率多步预测方法。利用现有数据衍生出高阶项与交互项,提升特征序列数量与有效特征占比。针对复杂的风电数据结构,使用变分模态分解(VMD)将其拆分,根据子序列相关性和方差贡献率的计算结果保留重要序列分量,其余分量进行聚合,降低计算负担,缩短训练时间。随后,引入注意力机制构造多头注意力时间卷积网络(MATCN),通过注意力得分调整网络内部卷积单元之间的传递信息,实现模型对各序列分量的预测。最后,重构序列分量预测值,得到最终的输出结果。在实例数据上对所提模型进行对比验证,结果表明,该模型在不同步幅下均具有较好的预测效果。

关键词：风电功率多步预测变分模态分解多头注意力时间卷积网络注意力机制信息调控