Gaoya dianqi, 2021 针对长期运行在大电流下的开关设备,其温升的考虑及试验是产品开发过程中的关键环节之一。由于GIS产品零部件多、空间结构复杂,理论计算无法体现温度分布,而有限元分析中,结合气流场的多物理场耦合计算,注重定性的理论分析,其涉及参数多,流体域分析占用资源大、计算不收敛等导致仿真结果不确定性大。文中以GIS中主要的发热设备母线及隔离开关为研究对象,结合传热学原理,研究等效热路及有限元分析,简化计算模型及方法,在等效热路分析中采用单一元件结合形状差异进行分割处理来提高计算精度,并提取等效热路法中的发热 ...
骆常璐 +5 more
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Gaoya dianqi, 2023 气体绝缘组合电器（GIS）和气体绝缘金属封闭输电线路（GIL）广泛应用于长距离、大容量输电线路中。但随着电压等级和输电容量的提升，气固界面性能面临着电荷积聚与固体绝缘子老化等挑战。为了降低绝缘故障的发生，亟需开展GIS/GIL气固界面绝缘机理、测量诊断、寿命评估等相关研究。文中首先总结了气固界面电荷积聚、消散机理以及影响沿面闪络的因素，结果表明温湿度、自由基等因素通过改变绝缘子电导率对沿面闪络造成影响。并针对在役运行绝缘子，着重分析了长期运行中多物理场耦合作用下GIS/GIL中气固界面绝缘失效与老化过程。
黄鸿飞 +5 more
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Development and application of software system for dynamic analysis of grain condition cloud map [PDF]
, 2020 Based on the theory of grain storage ecosystem, multi-field coupling and ventilation window, the dynamic analysis software of grain condition cloud map is researched and developed by WU model,sinusoidal model of grain temperature change, heat and mass ...
WU Wen-fu +4 more
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Gaoya dianqi, 2021 针对干式空心串联电抗器绕组匝间短路故障频发的运行实际,文中首次考虑了无功补偿回路中并联电容器对串联电抗器电磁特性的影响,建立了基于磁场—电路耦合原理的二维轴对称模型,以分析电抗器的电磁特性与故障特征之间的定量关系。首先阐述了电抗器电感量、电流和磁场的解析计算原理,建立了电磁耦合原理下的二维轴对称分析模型,鉴于电磁耦合多物理场分析计算的复杂性,文中利用有限元分析软件Comsol验证电抗器正常运行工况下所建二维轴对称模型的准确性,然后,进一步分析了电抗器在绕组不同位置匝间短路工况下的电磁特征量 ...
鲁尧, 咸日常, 王立权, 张万征
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Multi-physics Coupling Characteristics of Lead-bismuth Reactor Fuel Assembly Based on Oxidative Corrosion Behaviors [PDF]
Oxygen is the most promising non-metallic inhibitor in lead-bismuth cooled fast reactors (LFRs). The addition of oxygen to the coolant can format a protective oxide layer on the surface of structural materials, which will effectively alleviate the ...
JI Xu, CHAI Xiang, ZHANG Lefu, LIU Xiaojing
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Research progress on the application and development of the material point method in dynamic simulation of geological hazards [PDF]
Numerical simulation is commonly used to address large deformation geological disasters such as collapses, landslides, and debris flows. Accurately and efficiently simulating these issues has always been a challenge.
Bin LI +4 more
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Key Techniques and Applied Research on Engineering Vehicles' Noise Reduction, Energy Saving and Acoustic Comfort [PDF]
, 2016 当前，噪声已经成为衡量工程机械装备性能的一个重要指标。市场要求越来越高，相关的国家标准、国际标准日益严格。随着大功率产品的不断发展，整机噪声随之增加和热流密度不断提高，过低的冷却空气流量已满足不了发动机的热平衡要求，整机工作热流密度与逐渐降低的噪声限值的矛盾日益突出。同时，随着人们生活质量和品质追求的提高，整机声学舒适性也逐渐备受关注，对噪声的控制由最初的满足限值要求将转向声学舒适性的研究。因此，我国工程机械要发展并跻身世界市场，必须解决整机存在噪声偏大、热流密度高和声学舒适性差的共性问题 ...
张恩来
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Numerical Simulation of Solid Oxide Fuel Cell Tail Gas Catalytic Combustion Based on Three-Way Catalyst [PDF]
As a clean and efficient advanced power generation equipment, the solid oxide fuel cell (SOFC) has the structural advantages of separation of air and fuel gas, which makes it easy to enrich the CO2 in the tail gas of the fuel side.
AO Le +6 more
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Coupling relationship and application of GaN based LEDs [PDF]
, 2013 GaN基LED技术的迅速发展带来了照明技术新的革命，使人们的生活进入了固体照明时代。随着LED光效的提升，要求器件具有更大的尺寸和更高的注入电流。如何在大功率的工作条件下，仍能保持并进一步提升器件的光电转换效率，对器件结构设计提出了更大的挑战，也成为了近年来的研究热点。 本论文详细介绍了影响器件性能最为重要的三个物理场因素：电场、热场以及光场。在归纳总结了正装、倒装及垂直结构LED的电流分布解析模型的基础上，提出了改善电流分布均匀性的器件设计方案。讨论了包括焦耳热、非辐射复合热 ...
杨旭
core
Current Status and Challenges in Research on Chemistry and Radionuclide Migration Behavior of High-Level Radioactive Waste Disposal [PDF]
Nuclear energy, as a low-carbon and highly efficient clean energy source, relies for its sustainable development not only on advanced reactor technologies and fuel cycle efficiency, but more critically, on the ability to safely and permanently dispose of
Bo WANG +5 more
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