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Rotor Angle Stability Prediction Using Temporal and Topological Embedding Deep Neural Network based on Grid-informed Adjacency Matrix

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Journal of Modern power Systems and Clean Energy 2024年第3期12卷 695-706页

作者： Peiyuan Sun Long Huo xin Chen Siyuan liang the school of Electrical engineering Xi’an Jiaotong UniversityXi’an 710049China the school of Electrical engineering and the Center of Nanomaterials for Renewable EnergyState Key Laboratory of Electrical Insulation and Power EquipmentXi’an Jiaotong UniversityXi’an 710049China the Department of Computer science and engineering The Chinese University of Hong KongShatin999077Hong KongChina

Rotor angle stability(RAS)prediction is critically essential for maintaining normal operation of the interconnected synchronous machines in power *** wide deployment of phasor measurement units(PMUs)promotes the development of data-driven methods for RAS *** paper proposes a temporal and topological embedding deep neural network(TTEDNN)model to accurately and efficiently predict RAS by extracting the temporal and topological features from the PMU *** grid-informed adjacency matrix incorporates the structural and electrical parameter information of the power *** the small-signal RAS with disturbance under initial operating conditions and the {3. RAS with short circuits on transmission lines are *** studies of the IEEE 3.-bus and IEEE 3.0-bus power systems are used to test the performance,scalability,and robustness against measurement uncertainties of the TTEDNN *** show that the TTEDNN model performs best among existing deep learning ***,the superior transfer learning ability from small-signal RAS conditions to {3. RAS conditions has been proved.

关键词： Rotor angle stability prediction topological embedding deep learning graph convolution network

预混煤油/空气两相旋转爆轰传播特性数值研究

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推进技术 2024年第9期45卷 113-123页

作者：刘秋月王放翁春生赵庆军南京理工大学瞬态物理国家重点实验室江苏南京210094 中国科学院工程热物理研究所北京100190 轻型涡轮动力全国重点实验室北京100190 中国科学院大学航空宇航学院北京100049 分布式冷热电联供系统北京市重点实验室北京100190

为研究预混煤油/空气两相旋转爆轰波的传播特性,以煤油蒸气/液滴为燃料,空气为氧化剂,开展了二维旋转爆轰过程的数值模拟计算,研究了气态燃料当量比和液滴直径对气液两相旋转爆轰过程中流场结构、胞格形状和数目、爆轰分数以及传播速度... 详细信息

为研究预混煤油/空气两相旋转爆轰波的传播特性,以煤油蒸气/液滴为燃料,空气为氧化剂,开展了二维旋转爆轰过程的数值模拟计算,研究了气态燃料当量比和液滴直径对气液两相旋转爆轰过程中流场结构、胞格形状和数目、爆轰分数以及传播速度等特征的影响。结果表明:较高的气态燃料当量比和较小的液滴直径有利于旋转爆轰波的成功传播。气态燃料当量比为0.83.,可起爆的液滴直径增大至40μm。研究发现,爆轰波成功起爆的前提下,提高气态燃料当量比或减小液滴直径均利于胞格数目的增多和平均尺寸的减小,胞格数目为5.0~6.7,低于5.0爆轰波将无法维持传播;燃料的爆轰分数与气态燃料当量比和液滴直径有关,提高气态燃料当量比或减小液滴直径均促进燃料的爆轰分数以及爆轰波传播速度的提高,爆轰分数最高可达94.9%,爆轰波的传播速度为1 63..3.~1 777.62 m/s,速度亏损在13.以内。

关键词：旋转爆轰波气态燃料当量比两相爆轰传播特性数值仿真

Effects of Diesel Concentration on the Thermal Conductivity,Specific Heat Capacity and Thermal Diffusivity of Diesel-Contaminated Soil

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Journal of Thermal science 2024年第2期33卷 696-709页

作者： WU Yuhao WU Yuefei LUO Gubai ZHANG Teng WANG Qing FAN liwu SONG xin YU Zitao key laboratory of Clean Energy and Carbon Neutrality of Zhejiang Province Zhejiang UniversityHangzhou310027China State key laboratory of Clean Energy Utilization Zhejiang UniversityHangzhou310027China Institute of Thermal science and power Systems School of Energy EngineeringZhejiang UniversityHangzhou310027China Center Environmental Protection Technology Company limited Beijing100176China Institute of Soil science Chinese Academy of SciencesNanjing210008China

High energy consumption is a serious issue associated with in situ thermal desorption(TD)remediation of sites contaminated by petroleum hydrocarbons(PHs).The knowledge on the thermophysical properties of contaminated soil can help predict accurately the transient temperature distribution in a remediation site,for the purpose of energy ***,such data are rarely reported for PH-contaminated *** this study,by taking diesel as a representative example for PHs,soil samples with constant dry bulk density but different diesel mass concentrations ranging from 0% to 20% were prepared,and the variations of their thermal conductivity,specific heat capacity and thermal diffusivity were measured and analyzed over a wide temperature range between 0℃ and 120℃.It was found that the effect of diesel concentration on the thermal conductivity of soil is negligible when it is below 1%.When diesel concentration is below 10%,the thermal conductivity of soil increases with raising the ***,when diesel concentration becomes above 10%,the change of the thermal conductivity of soil with temperature exhibits the opposite *** is mainly due to the competition between soil minerals and diesel,because the thermal conductivity of minerals increases with temperature,whereas the thermal conductivity of diesel decreases with *** analysis results showed that,compared with temperature,the diesel concentration has more significant effects on soil thermal *** of the diesel concentration,with the increase of temperature,the specific heat capacity of soil increases,while the thermal diffusivity of soil *** addition,the results of a control experiment exhibited that the relative differences of the thermal conductivity of the soil samples containing the same concentration of both diesel and a pure alkane are all below 10%,indicating that the results obtained with diesel in this study can be extended to the family of PHs.A theo

关键词： contaminated soil diesel concentration thermal conductivity specific heat capacity thermal diffusivity thermal desorption fractal model

曲面反射装置对脉冲爆轰发动机外流场影响的数值模拟

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兵工学报 2023年第7期44卷 1966-1977页

作者：康杨李宁黄孝龙张君善翁春生南京理工大学瞬态物理国家重点实验室江苏南京210094 武警工程大学装备管理与保障学院陕西西安710086

为探索能够有效抑制脉冲爆轰发动机工作时产生的大功率爆轰噪声向发动机头部关键部位传播的技术途径,采用时空守恒元与求解元方法对加装椭球型反射罩、抛物线型反射罩和圆锥形反射罩三类反射装置的发动机出口流场进行数值模拟。研究结... 详细信息

为探索能够有效抑制脉冲爆轰发动机工作时产生的大功率爆轰噪声向发动机头部关键部位传播的技术途径,采用时空守恒元与求解元方法对加装椭球型反射罩、抛物线型反射罩和圆锥形反射罩三类反射装置的发动机出口流场进行数值模拟。研究结果表明,反射装置旋转面的反射特性差异造成三类反射装置对爆轰噪声的作用效果不同。椭球型反射罩将反射波汇聚到反射罩的轴线方向;抛物线型反射罩将反射波近似平行向下游汇聚;圆锥形反射罩不能产生滞后于直达波的反射波,反射波加强了直传波并一道向下游传播。

关键词：脉冲爆轰发动机爆轰噪声曲面反射装置反射波

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Einstein Probe discovery of EP240408a:A peculiar X-ray transient with an intermediate timescale

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science china(physics,Mechanics & Astronomy) 2024年

作者： Wenda Zhang Weimin Yuan Zhixing ling Yong Chen Nanda Rea Arne Rau Zhiming Cai Huaqing Cheng Francesco Coti Zelati lixin Dai Jingwei Hu Shumei Jia Chichuan Jin Dongyue li Paul O’brien Rongfeng Shen xinwen Shu Shengli Sun Xiaojin Sun Xiaofeng Wang Lei Yang bing Zhang Chen Zhang Shuang-Nan Zhang Yonghe Zhang Jie An David buckley Alexis Coleiro bertrand Cordier liming Dou Rob Eyles-Ferris Zhou Fan Hua Feng Shaoyu Fu Johan P. U. Fynbo Lluis Galbany Saurabh W. Jha Shuaiqing Jiang Albert Kong Erik Kuulkers Weihua Lei Wenxiong li bifang liu Mingjun liu xing liu Yuan liu Zhu liu Chandreyee Maitra Alessio Marino Itumeleng Monageng Kirpal Nandra Jeremy Sanders Roberto Soria lian Tao Junfeng Wang Song Wang Tinggui Wang Zhongxiang Wang Qingwen Wu Xuefeng Wu Dong Xu Yanjun Xu Suijian Xue Yongquan Xue Zijian Zhang Zipei Zhu Hu Zou Congying bao Fansheng Chen Houlei Chen Tianxiang Chen Wei Chen Yehai Chen Yifan Chen Chenzhou Cui Weiwei Cui Yanfeng Dai Dongwei Fan Ju Guan Dawei Han Dongjie Hou Haibo Hu Maohai Huang Jia Huo Zhenqing Jia bowen Jiang Ge Jin Chengkui li Junfei li Longhui li Maoshun li Wei li Zhengda li Tianying lian Congzhan liu Heyang liu Huaqiu liu Fangjun Lu Laidan Luo Jia Ma Xuan Mao Haiwu Pan xin Pan liming Song Hui Sun Yunyin Tan Qingjun Tang Yihan Tao Hao Wang Juan Wang Lei Wang Wenxin Wang Yilong Wang Yusa Wang Qinyu Wu Haitao Xu Jingjing Xu xinpeng Xu Yunfei Xu Zhao Xu Changbin Xue Yulong Xue Ailiang Yan Haonan Yang Xiongtao Yang Yanji Yang Juan Zhang Mo Zhang Wenjie Zhang Zhen Zhang Zhen Zhang Ziliang Zhang Donghua Zhao Haisheng Zhao Xiaofan Zhao Zijian Zhao Hongyan Zhou Yilin Zhou Yuxuan Zhu Zhencai Zhu Institut d’Estudis Espacials de Catalunya (IEEC) Max Planck Institute for Extraterrestrial physics Innovation Academy for Microsatellites Chinese Academy of sciences Department of physics university of Hong Kong school of physics and Astronomy university of Leicester school of physics and Astronomy Sun Yat-sen university national Astronomical Observatories Department of physics Anhui Normal university Shanghai Institute of Technical physics Chinese Academy of sciences physics Department Tsinghua university Nevada Center for Astrophysics university of Nevada Las Vegas Department of physics and Astronomy university of Nevada Las Vegas Chinese Academy of sciences South African Astronomical Observatory Department of Astronomy university of Cape Town Department of physics university of the Free State Universite' Paris Cite' CNRS Astroparticule et Cosmologie Universite' Paris Cite' CEA Paris-Saclay school of Astronomy and Space sciences IRFU/DAp-AIM Department of Astronomy Guangzhou university Cosmic Dawn Center (DAWN) Niels bohr Institute university of Copenhagen Department of physics and Astronomy Rutgers the State university of New Jersey Institute for Cosmic Ray Research university of Chinese Academy of sciences The university of Tokyo ESA/ESTEC Noordwijk 2201 AZ The Netherlands Department of Astronomy school of physics Huazhong university of science and Technology INAF-Osservatorio Astrofisico di Torino Sydney Institute for Astronomy school of physics key laboratory of Particle Astrophysics The university of Sydney Department of Astronomy Xiamen university Institute for Frontiers in Astronomy and Astrophysics beijing Normal university Department of Astronomy university of science and Technology Hefei school of Astronomy and Space sciences university of science and Technology of china Institute of High Energy physics Institute of Deep Space sciences Deep Space Exploration laboratory Department of Astronomy school of physics and Astronomy Yunnan university Shanghai Astronomical Observatory Chinese Academy of science

We report the discovery of a peculiar X-ray transient,EP240408a,by Einstein Probe （EP） and follow-up studies made with EP,Swift,NICER,GROND,ATCA and other ground-based multiwavelength *** new transient was first detected with Wide-field X-ray Telescope （WXT） on board EP on April 8th,2024,manifested in an intense yet brief X-ray flare lasting for *** flare reached a peak flux of 3.9×10-9erg cm-2s-1in 0.5-4 keV,3.0 times brighter than the underlying X-ray emission detected throughout the *** and more precise follow-up observations by EP/FXT,Swift and NICER confirmed the finding of this new *** X-ray spectrum is non-thermal in 0.5-10 keV,with a {3.-law photon index varying *** X-ray light curve shows a plateau lasting for4d,followed by a steep decay till becoming undetectable10 d after the initial *** on its temporal property and constraints from previous EP observations,an unusual timescale in the range of 7-23.d is found for EP240408a,which is intermediate between the commonly found fast and long-term *** counterparts have been found in optical and near-infrared,with the earliest observation at 17 h after the initial X-ray detection,suggestive of intrinsically weak emission in these *** demonstrate that the remarkable properties of EP240408a are inconsistent with any of the transient types known so far,by comparison with,in particular,jetted tidal disruption events,gamma-ray bursts,X-ray binaries and fast blue optical *** nature of EP240408a thus remains an *** suggest that EP240408a may represent a new type of transients with intermediate timescales of the order of10 *** detection and follow-ups of more of such objects are essential for revealing their origin.

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燃烧室轴向和周向长度对气液两相旋转爆轰特性的影响

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航空动力学报 2020年第8期35卷 1601-1611页

作者：李宝星许桂阳舒慧明翁春生赵凤起王研艳中国兵器工业集团有限公司西安近代化学研究所西安710065 南京理工大学瞬态物理重点实验室南京210094 南京工业职业技术大学电气工程学院南京210046

为了研究旋转爆轰发动机燃烧室轴向和周向长度对气液两相旋转爆轰特性的影响,采用守恒元和求解元(CE/SE)方法对带化学反应的汽油/富氧空气两相旋转爆轰理论模型进行求解,获得了气液两相旋转爆轰流场结构,并分析了燃烧室轴向和周向长度... 详细信息

为了研究旋转爆轰发动机燃烧室轴向和周向长度对气液两相旋转爆轰特性的影响,采用守恒元和求解元(CE/SE)方法对带化学反应的汽油/富氧空气两相旋转爆轰理论模型进行求解,获得了气液两相旋转爆轰流场结构,并分析了燃烧室轴向和周向长度对燃烧室流场、爆轰波传播特性以及发动机推力性能的影响。计算结果表明:轴向长度对燃烧室上游流场影响甚小,却对下游流场参数影响较显著。随着轴向长度增加,燃烧室出口压力、温度、密度以及周向速度均降低,轴向速度则逐渐增大,同时发动机平均推力密度和燃料比冲先增大后减小。当周向长度过短,燃烧室内难以形成自持传播的爆轰波,随着周向长度增加,上游爆轰波强度增加,对应的流场参数均有所增大,但发动机推力性能略有所降低。

关键词：旋转爆轰发动机轴向和周向长度气液两相爆轰特性守恒元/求解元方法

A review on heat transfer in nanoporous silica aerogel insulation materials and its modeling

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Energy Storage and Saving 2022年第4期1卷 217-240页

作者： Chuan-Yong Zhu Hai-bo Xu xin-Peng Zhao liang Gong Zeng-Yao li key laboratory of Thermo-Fluid and science and {3. Ministry of EducationSchool of Energy and Power EngineeringXi’an Jiaotong UniversityXi’an710049China College of New Energy China University of Petroleum(East China)Qingdao266580China

Silica aerogels are widely used in many fields for thermal insulation,such as building insulation,electric power energy,energy storage systems,and high-temperature thermal protection due to their excellent insulation ***,the heat transfer in silica aerogels and its modeling in recent years have attracted much attention and many valuable achievements have been *** heat transfer in nano-porous silica aerogels and its modeling methods are reviewed in this *** review starts with a brief introduction of heat transfer characteristics in silica aerogels,including the multi-component and multi-mode coupling effect,size effect,and multiscale *** the heat transfer mechanism of each mode,including heat transfer via gas phase,solid phase,and thermal radiation,is reviewed,and the models for predicting the gaseous thermal conductivity in nanoscale pores,gas-contributed thermal conductivity,the apparent thermal conductivity of solid skeleton,and finally the effective thermal conductivity are collected and discussed in ***,modeling of transient heat transfer in silica aerogels is also briefly ***,the conclusions and some problems which need to be further investigated in the future are provided.

关键词： Nanoporous silica aerogels Heat transfer characteristics Thermal conductivity Thermal insulation Modeling

Large eddy simulation of the transient cavitating vortical flow in a jet pump with special emphasis on the unstable limited operation stage

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Journal of Hydrodynamics 2020年第2期32卷 345-360页

作者： xin-ping Long Dan Zuo Huai-yu Cheng bin Ji Hubei key laboratory of Waterjet Theory and New Technology School of Power and Mechanical EngineeringWuhan UniversityWuhan430072China key laboratory of transients in Hydrau{3.c Machinery Ministry of EducationWuhan UniversityWuhan430072China State key laboratory of Water Resources and Hydropower {3. science Wuhan UniversityWuhan430072China

This paper studies the unsteady three-dimensional cavitating turbulent flow in a jet ***,thefocus is on the unstable limited operation stage,and both the computational and experimental methods are *** the experiments,the distribution of the wall pressure,as well as the evolution of cavitation over time,are obtained for a jet *** is carried out using the large eddy simulation,combined with a mass transfer cavitation *** numerical results are compared with the experimental results,including the fundamental performances(the pressure ratio h and the efficiencyη),as well as the wall pressure *** the experimental and computational results indicate that the evolution of the cavitation over time in a jet pump is a quasi-periodic process during the unstable limited operation *** annular vortex cavitation inception,development and collapse predicted by the large eddy simulation agree fairly well with the experimental ***,the relationship between the cavitation and the vortex structure is discussed based on the numerical results,and it is shown that the development of the vortex structures in the jet pump is closely related to the evolution of the *** cavitation-vortex interaction is thoroughly analyzed based on the vorticity transport *** analysis reveals that the cavitation in a jet pump dramatically influences the distribution and the production of the *** process of the annular cavitation inception,development,and collapse involves a significant increase of the vorticity.

关键词： Cavitation jet pump large eddy simulation vortex structure vorticity transport equation

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喷管对水下爆轰燃气射流过程影响的数值模拟

弹道学报 2023年第1期35卷 60-68页

作者：邵新科康杨胡锦桥李宁黄孝龙边哲民高荣维翁春生南京理工大学瞬态物理国家重点实验室江苏南京210094 南京理工大学能源与动力工程学院江苏南京210094

为了探究不同喷管构型对水下爆轰燃气射流形态与激波传播过程的影响,基于VOF多相流模型,通过求解二维非稳态雷诺时均Navier-Stokes方程分别对无喷管、加装扩张喷管、收敛喷管的爆轰管水下爆轰过程的内外流场进行二维轴对称数值模拟。研... 详细信息

为了探究不同喷管构型对水下爆轰燃气射流形态与激波传播过程的影响,基于VOF多相流模型,通过求解二维非稳态雷诺时均Navier-Stokes方程分别对无喷管、加装扩张喷管、收敛喷管的爆轰管水下爆轰过程的内外流场进行二维轴对称数值模拟。研究了喷管构型对水下爆轰过程中形成的透射与反射激波的传播特性、爆轰燃气射流形态演化规律等流场特性的影响。计算结果表明:扩张喷管可以加强向下游传播的透射激波沿轴线方向的指向性,而收敛喷管会减弱透射激波的强度,增强向上游传播的反射激波强度。爆轰燃气泡初期轴向和径向发展速度均随着时间逐渐衰减,喷管对燃气泡的轴向尺度影响较小,但收敛喷管能够显著抑制燃气泡的径向尺度。研究结果可为后续水下爆轰推进的工程化应用提供技术支撑。

关键词：水下爆轰喷管水下气体射流流场特性